47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
import { createReducer } from "../utils";
|
|
|
|
export const DEFAULT_LIMIT = 1; /** Default max number of elements to retrieve. */
|
|
|
|
const initialState = {
|
|
isFetching: false,
|
|
items: [],
|
|
total: 0,
|
|
error: ""
|
|
};
|
|
|
|
// 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 Object.assign({}, state, {
|
|
isFetching: true,
|
|
error: "",
|
|
});
|
|
},
|
|
[successType]: (state, payload) => {
|
|
return Object.assign({}, state, {
|
|
isFetching: false,
|
|
items: payload.items,
|
|
total: payload.total,
|
|
error: ""
|
|
});
|
|
},
|
|
[failureType]: (state, payload) => {
|
|
return Object.assign({}, state, {
|
|
isFetching: false,
|
|
error: payload.error
|
|
});
|
|
}
|
|
});
|
|
}
|