47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
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import { createReducer } from "../utils";
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export const DEFAULT_LIMIT = 30; /** Default max number of elements to retrieve. */
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const initialState = {
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isFetching: false,
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items: [],
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total: 0,
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error: ""
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};
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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 Object.assign({}, state, {
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isFetching: true,
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error: "",
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});
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},
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[successType]: (state, payload) => {
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return Object.assign({}, state, {
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isFetching: false,
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items: payload.items,
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total: payload.total,
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error: ""
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});
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},
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[failureType]: (state, payload) => {
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return Object.assign({}, state, {
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isFetching: false,
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error: payload.error
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});
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}
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});
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}
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