How to wait for dispatch to complete using thunk middleware? - reactjs

Question

I am using redux-thunk and want like to dispatch an action and once that is finished make an api call with part of that updated store.
store.js
const middleware = composeEnhancers(applyMiddleware(promise(), thunk, logger()))
const localStore = loadStore()
const store = createStore(reducer, localStore, middleware)
graphActions.js:
First add an Element:
export function addElement(element) {
return dispatch => {
dispatch({
type: ADD_ELEMENT,
payload: element
})
}
}
Then make api call via different action creator:
export function saveElements() {
return (dispatch, getState) => {
let graphId = getState().elements.id
let elements = getState().elements.elements
axios.put(Config.config.url + '/graph/' + graphId, {
'data': JSON.stringify({elements: elements}),
}).then(() => {
dispatch({type: SHOW_SUCCESS_SNACKBAR})
}).catch((err) => {
dispatch({type: SHOW_ERROR_SNACKBAR})
dispatch({type: UPDATE_ELEMENTS_REJECTED, payload: err})
})
}
}
I need to make sure, that addElement() is finished before saveElements(), so that saveElements() accesses the updated store.
I tried the following:
export function addElement(element) {
const promise = (dispatch) => new Promise((resolve) => {
dispatch({
type: ADD_ELEMENT,
payload: element
})
resolve()
})
return dispatch => {
promise(dispatch).then(() => {
saveElements()
})
}
}
ADD_ELEMENT is dispatched, but the actions within saveElements() are not dispatched, no api call is made.

Answer 1

I was missing to dispatch saveElements() and returning dispatch(saveElements()).
export function addElement(element) {
const promise = (dispatch) => new Promise((resolve) => {
dispatch({
type: ADD_ELEMENT,
payload: element
})
resolve()
})
return (dispatch) => {
return addElements(dispatch).then(() => {
return dispatch(saveElements())
})
}
UPDATE:
Noticed I can simply do:
export function addElement(element)
return (dispatch) => {
dispatch({
type: ADD_ELEMENT,
payload: element
})
dispatch(saveElements())
})
}