47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
import Immutable from "immutable";
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import { createReducer } from "../utils";
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import { stateRecord } from "../models/paginate";
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const initialState = new stateRecord();
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// Creates a reducer managing pagination, given the action types to handle,
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// and a function telling how to extract the key from an action.
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export default function paginate(types) {
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if (!Array.isArray(types) || types.length !== 3) {
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throw new Error("Expected types to be an array of three elements.");
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}
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if (!types.every(t => typeof t === "string")) {
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throw new Error("Expected types to be strings.");
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}
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const [ requestType, successType, failureType ] = types;
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return createReducer(initialState, {
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[requestType]: (state) => {
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return (
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state
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.set("isFetching", true)
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.set("error", null)
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);
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},
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[successType]: (state, payload) => {
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return (
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state
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.set("isFetching", false)
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.set("items", new Immutable.List(payload.items))
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.set("error", null)
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.set("nPages", payload.nPages)
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.set("currentPage", payload.currentPage)
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);
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},
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[failureType]: (state, payload) => {
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return (
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state
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.set("isFetching", false)
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.set("error", payload.error)
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);
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}
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});
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}
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