Use Case: I have a react application generated with JHipster. I need to get data from API, map to form contract, and then submit the form.
Problem: JHipster generated reducer code doesn't return a promise, so how do I know when a reducer action is finished? How can I call a function after getting an entity to update state?
Getting Entity and Returning the ICrudGetAction:
export interface IPayload<T> { // redux-action-type.ts (JHipster Code from node_modules)
type: string;
payload: AxiosPromise<T>;
meta?: any;
}
export type IPayloadResult<T> = ((dispatch: any) => IPayload<T> | Promise<IPayload<T>>);
export type ICrudGetAction<T> = (id: string | number) => IPayload<T> | ((dispatch: any) => IPayload<T>);
// Start of my reducer code
export default (state: AdState = initialState, action): AdState => {
switch (action.type) {
case REQUEST(ACTION_TYPES.FETCH_MYENTITY_LIST):
return {
...state,
errorMessage: null,
updateSuccess: false,
loading: true
};
case FAILURE(ACTION_TYPES.FETCH_MYENTITY_LIST):
return {
...state,
loading: false,
updating: false,
updateSuccess: false,
errorMessage: action.payload
};
case SUCCESS(ACTION_TYPES.FETCH_MYENTITY_LIST): {
const links = parseHeaderForLinks(action.payload.headers.link);
return {
...state,
loading: false,
links,
entities: loadMoreDataWhenScrolled(state.entities, action.payload.data, links),
totalItems: parseInt(action.payload.headers['x-total-count'], 10)
};
}
case ACTION_TYPES.RESET:
return {
...initialState
};
default:
return state;
}
};
export const getEntity: ICrudGetAction<IMyEntity> = id => {
const requestUrl = `${apiUrl}/${id}`;
return {
type: ACTION_TYPES.FETCH_ENTITY,
payload: axios.get<IMyEntity>(requestUrl)
};
};
I try to do this and it works but gives me compile errors:
this.props.getEntity(this.props.match.params.id).then((response) => {
// Map to form attributes and call setState
});
I get error message: TS2339: Property 'then' does not exist on type 'IPayload | ((dispatch: any) => IPayload)'. Property 'then' does not exist on type 'IPayload'.
This makes sense because we are not returning a promise. but how can I update the code to return a promise such that I don't break all the things that were autogenerated while also keeping the redux store updated?