Add tags support
Also fix misc bugs * Update README.md doc. * Fix relationships not shown in JSON API for a given paper if relationship was not referenced. * Handle tags
This commit is contained in:
parent
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153
README.md
153
README.md
@ -3,6 +3,30 @@ Metadata for arXiv
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The goal of this repository is to provide a minimal API to put metadata on arXiv papers.
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Disclaimer: This code is not scalable nor ready to run in production. In
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particular, it might be error-prone, and do not try to be resilient and keep
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trace of errors. It is here as a proof of concept and to back [this
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article](TODO) with some code. However, the `reference_fetcher` part is working
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quite well, and was able to extract most of the references from arXiv papers I
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tested it on. Note that it is quite long to run it on a paper, mainly due to
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the latency in [Crossref API](http://search.crossref.org/).
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## Special thanks
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Under the hood, this code uses the wonderful [Crossref
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API](http://search.crossref.org/) for reference parsing to DOI, which works
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really well and with a very large index.
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It also uses the [Dissemin API](http://beta.dissem.in/) in the
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`reference_fetcher` to try to find Open access versions of referenced papers.
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It works using the Open access [arXiv.org](http://arxiv.org) repository,
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without which it would be really difficult to achieve similar thing, due to
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paywalls and lack of sources. It also uses their
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[API](http://arxiv.org/help/api) to fetch DOIs from arXiv id and conversely.
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## Introduction
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Most of the published scientific papers are availabe online, as preprints. For
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@ -218,6 +242,95 @@ Accept: application/vnd.api+json
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```
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### Get tags
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```
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GET /tags
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Accept: application/vnd.api+json
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```
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Filtering is possible using ``id=ID``, ``name=NAME`` or any combination of
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these GET parameters. Other parameters are ignored.
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```json
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{
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"data": [
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{
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"type": "tags",
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"id": 1,
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"attributes": {
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"name": "foobar",
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},
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"links": {
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"self": "/tags/1"
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}
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}
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]
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}
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```
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### Get a tag by id
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```
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GET /tag/1
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Accept: application/vnd.api+json
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```
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```json
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{
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"data": {
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"type": "papers",
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"id": 1,
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"attributes": {
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"doi": "10.1126/science.1252319",
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"arxiv_id": "1401.2910"
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},
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"links": {
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"self": "/papers/1"
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},
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"relationships": {
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"cite": {
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"links": {
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"related": "/papers/1/relationships/cite"
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}
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},
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…
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}
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}
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}
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```
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### Create a tag
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```
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POST /tags
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Content-Type: application/vnd.api+json
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Accept: application/vnd.api+json
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{
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"data": {
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"name": "foobar",
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}
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}
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```
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```json
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{
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"data": {
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"type": "tags",
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"id": 1,
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"attributes": {
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"name": "foobar",
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},
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"links": {
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"self": "/tags/1"
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}
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}
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}
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```
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### Create a relationship between two papers
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```
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@ -236,6 +349,26 @@ Accept: application/vnd.api+json
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Response is empty HTTP 204.
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### Add a tag to a paper
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```
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POST /papers/1/relationships/tags
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Content-Type: application/vnd.api+json
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Accept: application/vnd.api+json
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{
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"data": [
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{ "type": "tags", "id": "2" },
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...
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]
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}
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```
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`id` is the id of the tag, which has to be created previously.
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Response is empty HTTP 204.
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### Delete a paper and associated relationships
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```
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@ -264,6 +397,26 @@ Accept: application/vnd.api+json
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Response is empty HTTP 204.
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### Deleting a tag for a paper
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```
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DELETE /papers/1/relationships/tags
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Content-Type: application/vnd.api+json
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Accept: application/vnd.api+json
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{
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"data": [
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{ "type": "tags", "id": "2" },
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...
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]
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}
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```
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`id` is the id of the tag.
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Response is empty HTTP 204.
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## Associated library
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`reference_fetcher` is a module you can use to:
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79
database.py
79
database.py
@ -4,7 +4,7 @@ This file contains the database schema in SQLAlchemy format.
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import sqlite3
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from sqlalchemy import event
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from sqlalchemy import Column, ForeignKey, Integer, String
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from sqlalchemy import Column, ForeignKey, Integer, String, Table
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from sqlalchemy.engine import Engine
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import relationship as sqlalchemy_relationship
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@ -24,9 +24,9 @@ def set_sqlite_pragma(dbapi_connection, connection_record):
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cursor.close()
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class Association(Base):
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class RelationshipAssociation(Base):
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# Relationships are to be read "left RELATION right"
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__tablename__ = "association"
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__tablename__ = "relationship_association"
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id = Column(Integer, primary_key=True)
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left_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"))
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right_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"))
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@ -45,6 +45,12 @@ class Association(Base):
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back_populates="related_to",
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passive_deletes=True)
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tag_association_table = Table(
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'tag_association', Base.metadata,
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Column('paper_id', Integer, ForeignKey('papers.id', ondelete="CASCADE")),
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Column('tag_id', Integer, ForeignKey('tags.id', ondelete="CASCADE"))
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)
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class Paper(Base):
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__tablename__ = "papers"
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@ -52,15 +58,19 @@ class Paper(Base):
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doi = Column(String(), nullable=True, unique=True)
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arxiv_id = Column(String(25), nullable=True, unique=True)
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# related_to are papers related to this paper (this_paper R …)
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related_to = sqlalchemy_relationship("Association",
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foreign_keys="Association.left_id",
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related_to = sqlalchemy_relationship("RelationshipAssociation",
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foreign_keys="RelationshipAssociation.left_id",
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back_populates="left_paper",
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passive_deletes=True)
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# related_by are papers referenced by this paper (… R this_paper)
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related_by = sqlalchemy_relationship("Association",
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foreign_keys="Association.right_id",
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related_by = sqlalchemy_relationship("RelationshipAssociation",
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foreign_keys="RelationshipAssociation.right_id",
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back_populates="right_paper",
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passive_deletes=True)
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# Tags relationship
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tags = sqlalchemy_relationship("Tag",
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secondary=tag_association_table,
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backref="papers")
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def __repr__(self):
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return "<Paper(id='%d', doi='%s', arxiv_id='%s')>" % (
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@ -69,11 +79,27 @@ class Paper(Base):
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self.arxiv_id,
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)
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def json_api_repr(self):
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def json_api_repr(self, db):
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"""
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Dict to dump for the JSON API.
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"""
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relationships = [a.relationship.name for a in self.related_to]
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relationships = [i.name for i in db.query(Relationship).all()]
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relationships_dict = {
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k: {
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"links": {
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"related": (
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"/papers/%d/relationships/%s?reverse={reverse}" %
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(self.id, k)
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)
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}
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}
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for k in relationships
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}
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relationships_dict["tags"] = {
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"links": {
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"related": "/papers/%d/relationships/tags" % (self.id,)
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}
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}
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return {
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"types": self.__tablename__,
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"id": self.id,
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@ -84,17 +110,7 @@ class Paper(Base):
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"links": {
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"self": "/papers/%d" % (self.id,)
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},
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"relationships": {
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k: {
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"links": {
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"related": (
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"/papers/%d/relationships/%s?reverse={reverse}" %
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(self.id, k)
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)
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}
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}
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for k in relationships
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}
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"relationships": relationships_dict
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}
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@ -102,6 +118,27 @@ class Relationship(Base):
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__tablename__ = "relationships"
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id = Column(Integer, primary_key=True)
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name = Column(String(), unique=True)
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associations = sqlalchemy_relationship("Association",
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associations = sqlalchemy_relationship("RelationshipAssociation",
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back_populates="relationship",
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passive_deletes=True)
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class Tag(Base):
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__tablename__ = "tags"
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id = Column(Integer, primary_key=True)
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name = Column(String(), unique=True)
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def json_api_repr(self):
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"""
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Dict to dump for the JSON API.
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"""
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return {
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"types": self.__tablename__,
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"id": self.id,
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"attributes": {
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"name": self.name,
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},
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"links": {
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"self": "/tags/%d" % (self.id,)
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}
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}
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6
main.py
6
main.py
@ -41,7 +41,7 @@ def index():
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}))
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app.get("/papers", callback=routes.get.fetch_papers)
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app.get("/papers/<id:int>", callback=routes.get.fetch_by_id)
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app.get("/papers/<id:int>", callback=routes.get.fetch_papers_by_id)
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app.get("/papers/<id:int>/relationships/<name>",
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callback=routes.get.fetch_relationship)
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app.get("/papers/<id:int>/<name>",
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@ -51,8 +51,12 @@ app.route("/papers/<id:int>", method="DELETE",
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app.route("/papers/<id:int>/relationships/<name>", method="DELETE",
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callback=routes.delete.delete_relationship)
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app.get("/tags", callback=routes.get.fetch_tags)
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app.get("/tags/<id:int>", callback=routes.get.fetch_tags_by_id)
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app.post("/papers", callback=routes.post.create_paper)
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app.post("/tags", callback=routes.post.create_tag)
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app.post("/papers/<id:int>/relationships/<name>",
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callback=routes.post.update_relationships)
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@ -73,13 +73,27 @@ def delete_relationship(id, name, db):
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return bottle.HTTPError(403, "Forbidden")
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# Delete all the requested relationships
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for i in data:
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relationship = (db.query(database.Association)
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.filter_by(left_id=id, right_id=i["id"])
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.filter(database.Relationship.name == name)
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.first())
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if relationship is None:
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# An error occurred => 403
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return bottle.HTTPError(403, "Forbidden")
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db.delete(relationship)
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if i["type"] == "tags":
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# Handle tags separately
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tag = db.query(database.Tag).filter_by(id=i["id"]).first()
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paper = db.query(database.Paper).filter_by(id=id).first()
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if paper is None or tag is None:
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# An error occurred => 403
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return bottle.HTTPError(403, "Forbidden")
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try:
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paper.tags.remove(tag)
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except ValueError:
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# An error occurred => 403
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return bottle.HTTPError(403, "Forbidden")
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db.flush()
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else:
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relationship = (db.query(database.RelationshipAssociation)
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.filter_by(left_id=id, right_id=i["id"])
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.filter(database.Relationship.name == name)
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.first())
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if relationship is None:
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# An error occurred => 403
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return bottle.HTTPError(403, "Forbidden")
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db.delete(relationship)
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# Return an empty 204 on success
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return tools.APIResponse(status=204, body="")
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119
routes/get.py
119
routes/get.py
@ -56,14 +56,14 @@ def fetch_papers(db):
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resources = db.query(database.Paper).filter_by(**filters).all()
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if resources:
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return tools.APIResponse(tools.pretty_json({
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"data": [resource.json_api_repr() for resource in resources]
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"data": [resource.json_api_repr(db) for resource in resources]
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}))
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return bottle.HTTPError(404, "Not found")
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def fetch_by_id(id, db):
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def fetch_papers_by_id(id, db):
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"""
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Fetch a resource identified by its internal id.
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Fetch a paper identified by its internal id.
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.. code-block:: bash
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@ -102,7 +102,7 @@ def fetch_by_id(id, db):
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resource = db.query(database.Paper).filter_by(id=id).first()
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if resource:
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return tools.APIResponse(tools.pretty_json({
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"data": resource.json_api_repr()
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"data": resource.json_api_repr(db)
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}))
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return bottle.HTTPError(404, "Not found")
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@ -152,12 +152,111 @@ def fetch_relationship(id, name, db):
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"data": [
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]
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}
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if reversed:
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relationships = resource.related_by
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# Tags are handled differently
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if name == "tags":
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for t in resource.tags:
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response["data"].append({
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"type": name,
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"id": t.id
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})
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else:
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relationships = resource.related_to
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for r in relationships:
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if r.relationship.name == name:
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response["data"].append({"type": name, "id": r.right_id})
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if reversed:
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relationships = resource.related_by
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else:
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relationships = resource.related_to
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for r in relationships:
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if r.relationship.name == name:
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response["data"].append({"type": name, "id": r.right_id})
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return tools.APIResponse(tools.pretty_json(response))
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return bottle.HTTPError(404, "Not found")
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def fetch_tags(db):
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"""
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Fetch all matching tags.
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.. code-block:: bash
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GET /tags
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Accept: application/vnd.api+json
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Filtering is possible using ``id=ID``, ``name=NAME`` or any combination of
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these GET parameters. Other parameters are ignored.
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.. code-block:: json
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{
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"data": [
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{
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"type": "tags",
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"id": 1,
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"attributes": {
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"name": "foobar",
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},
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"links": {
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"self": "/tags/1"
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}
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}
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]
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}
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:param db: A database session, injected by the ``Bottle`` plugin.
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:returns: An ``HTTPResponse``.
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"""
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filters = {k: bottle.request.params[k]
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for k in bottle.request.params
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if k in ["id", "name"]}
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resources = db.query(database.Tags).filter_by(**filters).all()
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if resources:
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return tools.APIResponse(tools.pretty_json({
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"data": [resource.json_api_repr() for resource in resources]
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}))
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return bottle.HTTPError(404, "Not found")
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def fetch_tags_by_id(id, db):
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"""
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Fetch a tag identified by its internal id.
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.. code-block:: bash
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GET /tag/1
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Accept: application/vnd.api+json
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.. code-block:: json
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{
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"data": {
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"type": "papers",
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"id": 1,
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"attributes": {
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"doi": "10.1126/science.1252319",
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"arxiv_id": "1401.2910"
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},
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"links": {
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"self": "/papers/1"
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},
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"relationships": {
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"cite": {
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"links": {
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"related": "/papers/1/relationships/cite"
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}
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},
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…
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}
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}
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}
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:param id: The id of the requested tag.
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:param db: A database session, injected by the ``Bottle`` plugin.
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:returns: An ``HTTPResponse``.
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"""
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resource = db.query(database.Tags).filter_by(id=id).first()
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if resource:
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return tools.APIResponse(tools.pretty_json({
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"data": resource.json_api_repr()
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}))
|
||||
return bottle.HTTPError(404, "Not found")
|
||||
|
@ -12,7 +12,7 @@ from reference_fetcher import arxiv
|
||||
|
||||
def create_paper(db):
|
||||
"""
|
||||
Create a new resource identified by its DOI or arXiv eprint id.
|
||||
Create a new paper identified by its DOI or arXiv eprint id.
|
||||
|
||||
.. code-block:: bash
|
||||
|
||||
@ -76,7 +76,7 @@ def create_paper(db):
|
||||
|
||||
# Return the resource
|
||||
response = {
|
||||
"data": paper.json_api_repr()
|
||||
"data": paper.json_api_repr(db)
|
||||
}
|
||||
# Import "cite" relation
|
||||
add_cite_relationship(paper, db)
|
||||
@ -153,7 +153,6 @@ def add_cite_relationship(paper, db):
|
||||
:param db: A database session
|
||||
:returns: Nothing.
|
||||
"""
|
||||
# TODO: Known bug: too many levels of recursion!
|
||||
# If paper is on arXiv
|
||||
if paper.arxiv_id is not None:
|
||||
# Get the cited DOIs
|
||||
@ -169,7 +168,8 @@ def add_cite_relationship(paper, db):
|
||||
# If paper does not exist in db, add it
|
||||
right_paper = create_by_doi(doi, db)
|
||||
# Update cite relationship for this paper, recursively
|
||||
add_cite_relationship(right_paper, db)
|
||||
# TODO: Known bug: too many levels of recursion!
|
||||
# add_cite_relationship(right_paper, db)
|
||||
# Update the relationships
|
||||
update_relationship_backend(paper.id, right_paper.id, "cite", db)
|
||||
# If paper is not on arXiv, nothing to do
|
||||
@ -216,10 +216,21 @@ def update_relationships(id, name, db):
|
||||
return bottle.HTTPError(403, "Forbidden")
|
||||
# Update all the relationships
|
||||
for i in data:
|
||||
updated = update_relationship_backend(id, i["id"], name, db)
|
||||
if updated is None:
|
||||
# An error occurred => 403
|
||||
return bottle.HTTPError(403, "Forbidden")
|
||||
if i["type"] == "tags":
|
||||
# Handle tags separately
|
||||
tag = db.query(database.Tag).filter_by(id=i["id"]).first()
|
||||
paper = db.query(database.Paper).filter_by(id=id).first()
|
||||
if paper is None or tag is None:
|
||||
# An error occurred => 403
|
||||
return bottle.HTTPError(403, "Forbidden")
|
||||
paper.tags.append(tag)
|
||||
db.add(paper)
|
||||
db.flush()
|
||||
else:
|
||||
updated = update_relationship_backend(id, i["id"], name, db)
|
||||
if updated is None:
|
||||
# An error occurred => 403
|
||||
return bottle.HTTPError(403, "Forbidden")
|
||||
# Return an empty 204 on success
|
||||
return tools.APIResponse(status=204, body="")
|
||||
|
||||
@ -246,7 +257,7 @@ def update_relationship_backend(left_id, right_id, name, db):
|
||||
db.add(relationship)
|
||||
db.flush()
|
||||
# Update the relationship
|
||||
a = database.Association(relationship_id=relationship.id)
|
||||
a = database.RelationshipAssociation(relationship_id=relationship.id)
|
||||
a.right_paper = right_paper
|
||||
left_paper.related_to.append(a)
|
||||
try:
|
||||
@ -257,3 +268,70 @@ def update_relationship_backend(left_id, right_id, name, db):
|
||||
db.rollback()
|
||||
return None
|
||||
return left_paper
|
||||
|
||||
|
||||
def create_tag(db):
|
||||
"""
|
||||
Create a new tag.
|
||||
|
||||
.. code-block:: bash
|
||||
|
||||
POST /tags
|
||||
Content-Type: application/vnd.api+json
|
||||
Accept: application/vnd.api+json
|
||||
|
||||
{
|
||||
"data": {
|
||||
"name": "foobar",
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
.. code-block:: json
|
||||
|
||||
{
|
||||
"data": {
|
||||
"type": "tags",
|
||||
"id": 1,
|
||||
"attributes": {
|
||||
"name": "foobar",
|
||||
},
|
||||
"links": {
|
||||
"self": "/tags/1"
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
:param db: A database session, injected by the ``Bottle`` plugin.
|
||||
:returns: An ``HTTPResponse``.
|
||||
"""
|
||||
data = json.loads(bottle.request.body.read().decode("utf-8"))
|
||||
# Validate the request
|
||||
if("data" not in data or
|
||||
"type" not in data["data"] or
|
||||
data["data"]["type"] != "tags" or
|
||||
"name" not in data["data"]):
|
||||
return bottle.HTTPError(403, "Forbidden")
|
||||
|
||||
data = data["data"]
|
||||
|
||||
tag = database.Tag(name=data["name"])
|
||||
|
||||
# Add it to the database
|
||||
try:
|
||||
db.add(tag)
|
||||
db.flush()
|
||||
except IntegrityError:
|
||||
# Unique constraint violation, paper already exists
|
||||
db.rollback()
|
||||
return bottle.HTTPError(409, "Conflict")
|
||||
|
||||
# Return the resource
|
||||
response = {
|
||||
"data": tag.json_api_repr()
|
||||
}
|
||||
# Return 200 with the correct body
|
||||
headers = {"Location": "/tags/%d" % (tag.id,)}
|
||||
return tools.APIResponse(status=200,
|
||||
body=tools.pretty_json(response),
|
||||
headers=headers)
|
||||
|
Loading…
Reference in New Issue
Block a user