OnQueryStarted dispatch mutation and can't get error in the component using hook

[JoseAntpr]

Hi community, recently I´ve started to use RTK Query for a personal PoC thinking to use in the company project.

In my proof of concept I´m using two injectEndpoint apis and I have a login in two steps.

CODE ....

login: build.mutation<loginResponse, loginArgs>({
      queryFn: async ({ email, password }) => {
        const result = await loginWithEmailAndPassword({ email, password });

        const { login, password: plexPassword } = (await (
          await getDoc(doc(FibaseDB, "example", result.uid))
        ).data()) as { login: string; password: string };
        return { data: { ...result, login, password: password2} };
      },
      onQueryStarted: async (_, { dispatch, queryFulfilled }) => {
        const {
          data: { email, uid, login, password },
        } = await queryFulfilled;

// I know that setAuth dispatch maybe its better to use addMatcher to performance
        dispatch(authSlice.actions.setAuth({ uid, email }));

// I want to dispatch this second mutation after the firtst login is fullfilled 
        dispatch(plexApi.endpoints.step2Login.initiate({ login, password }));
      },
    }),

The problem is when this second step of the login failed I want to show the error in the loginComponent but the hook doesn't work.

export const LoginPage = () => {
  const [login, { error }] = useLoginMutation();
  const [_, { isError, data }] = useStep2LoginMutation();

....
}

isError is always false although mutation fails ... Only works if the triggers is done in the component but if the mutation fails done by onQueryStarted I can't get error or data using the hook.

Do we have another way to get the error in the component ? What's wrong ?

[phryneas]

If you call useMutation on the same endpoint in two different components, you get two independent results - and it's the same if you call initiate in one place and useMutation in the other. If you don't want to have that behaviour, please read up on shared mutation results

[JoseAntpr]

ohh sounds great but how can pass this fixedCacheKey to the initiate ?

[JoseAntpr]

Ohh I see ... I can pass this option to initiate function too ... I´m going to test it this behaviour I´ll come back !!