fetchPolicy in ApolloClient's defaultOptions being ignored about react-apollo-hooks

[dmarkow]

Looking at ApolloClient's code, it looks like it merges client options with default options like this:

if (this.defaultOptions.watchQuery) {
  options = {
    ...this.defaultOptions.watchQuery,
    ...options,
  } as WatchQueryOptions<TVariables>;
}

Because React Apollo Hooks passes an options object with a fetchPolicy key, it overrides the defaults (even if fetchPolicy is null or undefined). I think the only way for this to work (without Apollo Client changing how it merges default options) would be to completely omit any unused options (in my case it's affecting fetchPolicy, but it is probably also affecting errorPolicy, etc.

React Apollo's <Query /> component deals with this by "compacting" the options before passing them on. See https://github.com/apollographql/react-apollo/blob/master/src/Query.tsx#L36 and https://github.com/apollographql/react-apollo/blob/master/src/Query.tsx#L277

There's also an open issue on apollo-client about this.