ampache_react/app/reducers/paginate.js

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