Dispatching an action handled by redux-saga returns promise. It looks like redux-thunk, but with pure action creators.
class MyComponent extends React.Component {
componentWillMount() {
// `doSomething` dispatches an action which is handled by some saga
this.props.doSomething().then((detail) => {
console.log('Yaay!', detail)
}).catch((error) => {
console.log('Oops!', error)
})
}
}
redux-saga-thunkuses Flux Standard Action to determine action'spayload,erroretc.
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There are two reasons I created this library: Server Side Rendering and redux-form.
When using redux-saga on server, you will need to know when your actions have been finished so you can send the response to the client. There are several ways to handle that case, and redux-saga-thunk approach is the one I like most. See an example.
With redux-form, you need to return a promise from dispatch inside your submit handler so it will know when the submission is complete. See an example
Finally, that's a nice way to migrate your codebase from redux-thunk to redux-saga, since you will not need to change how you dispatch your actions, they will still return promises.
$ npm install --save redux-saga-thunk
Add middleware to your redux configuration (before redux-saga middleware):
import { createStore, applyMiddleware } from 'redux'
import createSagaMiddleware from 'redux-saga'
import { middleware as thunkMiddleware } from 'redux-saga-thunk'
^
const sagaMiddleware = createSagaMiddleware()
const store = createStore({}, applyMiddleware(thunkMiddleware, sagaMiddleware))
^You just need to set meta.thunk to true on your request actions and put it on your response actions inside the saga:
const action = {
type: 'RESOURCE_REQUEST',
payload: { id: 'foo' },
meta: {
thunk: true
^
}
}
// send the action
store.dispatch(action).then((detail) => {
// payload == detail
console.log('Yaay!', detail)
}).catch((e) => {
// payload == e
console.log('Oops!', e)
})
function* saga() {
while(true) {
const { payload, meta } = yield take('RESOURCE_REQUEST')
^
try {
const detail = yield call(callApi, payload) // payload == { id: 'foo' }
yield put({
type: 'RESOURCE_SUCCESS',
payload: detail,
meta
^
})
} catch (e) {
yield put({
type: 'RESOURCE_FAILURE',
payload: e,
error: true,
^
meta
^
})
}
}
}redux-saga-thunk will automatically transform your request action and inject a key into it.
You can also use it inside sagas with put.resolve:
function *someSaga() {
try {
const detail = yield put.resolve(action)
console.log('Yaay!', detail)
} catch (error) {
console.log('Oops!', error)
}
}To use pending, rejected, fulfilled and done selectors, you'll need to add the thunkReducer to your store:
import { combineReducers } from 'redux'
import { reducer as thunkReducer } from 'redux-saga-thunk'
const reducer = combineReducers({
thunk: thunkReducer,
// your reducers...
})Now you can use selectors on your containers:
import { pending, rejected, fulfilled, done } from 'redux-saga-thunk'
const mapStateToProps = state => ({
loading: pending(state, 'RESOURCE_CREATE_REQUEST'),
error: rejected(state, 'RESOURCE_CREATE_REQUEST'),
success: fulfilled(state, 'RESOURCE_CREATE_REQUEST'),
done: done(state, 'RESOURCE_CREATE_REQUEST'),
})Clean state
Parameters
Examples
const mapDispatchToProps = (dispatch, ownProps) => ({
cleanFetchUserStateForAllIds: () => dispatch(clean('FETCH_USER')),
cleanFetchUserStateForSpecifiedId: () => dispatch(clean('FETCH_USER', ownProps.id)),
cleanFetchUsersState: () => dispatch(clean('FETCH_USERS')),
})Tells if an action is pending
Parameters
Examples
const mapStateToProps = state => ({
fooIsPending: pending(state, 'FOO'),
barForId42IsPending: pending(state, 'BAR', 42),
barForAnyIdIsPending: pending(state, 'BAR'),
fooOrBazIsPending: pending(state, ['FOO', 'BAZ']),
fooOrBarForId42IsPending: pending(state, ['FOO', ['BAR', 42]]),
anythingIsPending: pending(state)
})Returns boolean
Tells if an action was rejected
Parameters
Examples
const mapStateToProps = state => ({
fooWasRejected: rejected(state, 'FOO'),
barForId42WasRejected: rejected(state, 'BAR', 42),
barForAnyIdWasRejected: rejected(state, 'BAR'),
fooOrBazWasRejected: rejected(state, ['FOO', 'BAZ']),
fooOrBarForId42WasRejected: rejected(state, ['FOO', ['BAR', 42]]),
anythingWasRejected: rejected(state)
})Returns boolean
Tells if an action is fulfilled
Parameters
Examples
const mapStateToProps = state => ({
fooIsFulfilled: fulfilled(state, 'FOO'),
barForId42IsFulfilled: fulfilled(state, 'BAR', 42),
barForAnyIdIsFulfilled: fulfilled(state, 'BAR'),
fooOrBazIsFulfilled: fulfilled(state, ['FOO', 'BAZ']),
fooOrBarForId42IsFulfilled: fulfilled(state, ['FOO', ['BAR', 42]]),
anythingIsFulfilled: fulfilled(state)
})Returns boolean
Tells if an action is done
Parameters
Examples
const mapStateToProps = state => ({
fooIsDone: done(state, 'FOO'),
barForId42IsDone: done(state, 'BAR', 42),
barForAnyIdIsDone: done(state, 'BAR'),
fooOrBazIsDone: done(state, ['FOO', 'BAZ']),
fooOrBarForId42IsDone: done(state, ['FOO', ['BAR', 42]]),
anythingIsDone: done(state)
})Returns boolean
MIT © Diego Haz
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