62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
/**
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* This implements a wrapper to create reducers for paginated content.
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*/
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// NPM imports
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import Immutable from "immutable";
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// Local imports
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import { createReducer } from "../utils";
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// Models
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import { stateRecord } from "../models/paginated";
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// Actions
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import { CLEAR_PAGINATED_RESULTS, INVALIDATE_STORE } from "../actions";
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/** Initial state of the reducer */
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const initialState = new stateRecord();
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/**
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* Creates a reducer managing pagination, given the action types to handle.
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*/
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export default function paginated(types) {
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// Check parameters
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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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// Create reducer
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return createReducer(initialState, {
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[requestType]: (state) => {
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return state;
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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("type", payload.type)
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.set("result", Immutable.fromJS(payload.result))
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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) => {
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return state;
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},
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[CLEAR_PAGINATED_RESULTS]: (state) => {
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return state.set("result", new Immutable.List());
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},
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[INVALIDATE_STORE]: () => {
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// Reset state on invalidation
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return new stateRecord();
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},
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});
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}
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