#Graphql nested fragments how to
#Graphql nested fragments generator
#Graphql nested fragments update

That leads us to a problem though how do we get the cursor from the object? We wouldn't want cursor to live on the User type it's a property of the connection, not of the object. As a reminder that the cursors are opaque and that their format should not be relied upon, we suggest base64 encoding them. Especially if the cursors are opaque, either offset or ID-based pagination can be implemented using cursor-based pagination (by making the cursor the offset or the ID), and using cursors gives additional flexibility if the pagination model changes in the future. In general, we've found that cursor-based pagination is the most powerful of those designed.

We could do something like friends(first:2 after:$friendCursor), where we get a cursor from the last item and use that to paginate.

We could do something like friends(first:2 after:$friendId), to ask for the next two after the last friend we fetched.

We could do something like friends(first:2 offset:2) to ask for the next two in the list.

There are a number of ways we could do pagination: How can we enable that behavior? Pagination and Edges #

#Graphql nested fragments generator

If you want to auto-generate the introspection result, there's a tool called GraphQL Code Generator that does it.But if we just fetched the first two, we might want to paginate through the list as well once the client fetches the first two friends, they might want to send a second request to ask for the next two friends. You can automate this or set this as a script to run at build time.

Query your server / schema to obtain the necessary information about unions and interfaces and write it to a file.

To set it up, follow the three steps below: We recommend setting up a build step that extracts the necessary information from the schema into a JSON file, where it can be imported from when constructing the fragment matcher.

#Graphql nested fragments update

If there are any changes related to union or interface types in your schema, you will have to update the fragment matcher accordingly. To support result validation and accurate fragment matching on unions and interfaces, a special fragment matcher called the IntrospectionFragmentMatcher can be used.

#Graphql nested fragments how to

The section below explains how to pass the necessary schema knowledge to the Apollo Client cache so unions and interfaces can be accurately matched and results validated before writing them into the store. The IntrospectionFragmentMatcher is the solution for working with unions/interfaces, and is explained in more detail below. Apollo Client will let you know this with a console warning (in development), if it attempts to use the default heuristic fragment matcher with unions/interfaces. Also, the heuristic fragment matcher will not work accurately when using fragments with unions or interfaces. This works in most cases, but it also means that Apollo Client cannot check the server response for you, and it cannot tell you when you're manually writing invalid data into the store using update, updateQuery, writeQuery, etc. By default, Apollo Client's cache will use a heuristic fragment matcher, which assumes that a fragment matched if the result included all the fields in its selection set, and didn't match when any field was missing. Both Jedi and Droid are possible concrete types of Character, but on the client there is no way to know that without having some information about the schema. In the query above, all_people returns a result of type Character. To do so, we can simply share a fragment describing the fields we need for a comment: This way we can be sure that we render consistent comment objects as the data changes.

For instance, in GitHunt on the comments page, we want to fetch the same fields after posting a comment as we originally query. The most straightforward use of fragments is to reuse parts of queries (or mutations or subscriptions) in various parts of your application. In this document we'll outline patterns to do both we'll also make use of utilities in the graphql-anywhere and graphql-tag packages which aim to help us, especially with the second problem. Breaking your queries up to allow you to co-locate field access with the places they are used.Sharing fields between multiple queries, mutations or subscriptions.There are two principal uses for fragments in Apollo:

In this case, people is of type Person and we want to select the firstName and lastName fields from people(id: '7'). It's important to note that the component after the on clause is designated for the type we are selecting from.