8/31/2023 0 Comments Graphql conditional fragmentYou can think of it as functions in programming languages, that are reusable units.Ī GraphQL Fragment is a reusable unit of a GraphQL query, which creates a shared piece of query logic. If you notice that your query has many repetitive fields in multiple areas, you can consolidate them into a reusable unit called a fragment.Ī GraphQL fragment lets you build multiple fields, and include them in multiple queries. In GraphQL, you may run into situations where you need to query for the same fields in different queries. In this example, we counted every field, no matter if it was on fragment definitions or if it was skipped. A GraphQL fragment is a reusable part of the query. Field Arguments Errors Conditional Analysis. In this post, we are going to learn about what a fragment is in GraphQL. and combines TypeScript generics, conditional types, and type merging to. Is there a way to run this query with the current library In a raw GraphQL call this would be achieved using conditional fragments like so: query a. Robust, composable type definition for GraphQL in TypeScript/JavaScript. Octo2 min read 683 What is a GraphQL fragment? I am trying to run a query returning a union type (e.g. fragment : GraphQL fragment specified using a graphql template literal. If you for instance have Query.artist(.) then the field itself is a sufficiently unique key, if it's the only access point to this same edge and you only ever need it to be resolved from a prior query.īeta Was this translation helpful? Give feedback.Adhithi Ravichandran Follow Software consultant, Pluralsight author, speaker, React Native/React/GraphQL dev, and Indian classical musician. Hook used to fetch a GraphQL query during render for React Legacy Mode (i.e. Let’s use a GatsbyJS-powered blog as an example of how to make and. 28 I am new to graphql and I am struggling with a query. I'd suspect however that in your case you don't need to give the edge any keyable field. GraphQL fragments are reusable units of query fields that can be used within the same query or across multiple queries. for edges that represent parent-child relations, where the edge may appear both on a parent entity and child entity. It's more common to give the edge a key if it appears in multiple places, e.g. For example, in a "result edge" the User may update but the edge doesn't have to know about this. In many cases you can get away with no key hence, because it's likely that the edge is only ever appearing in "one place" meaning, there are no cases where the edge needs to update or does update. However, this is fairly limited it's very awkward for defining conditionals on more than one field, requires the conditional to be like an enum, and is frankly confusing in the context of Relay, if I want to have this type be a node, but somehow have the concrete type of the node change under me. This means that it's commonly unique to a key that's more akin to A's key + B's key. And then just define fragments on ActiveTodo or CompletedTodo as needed. An edge is mostly useful because it just says "A is related to B". Thank you as always!īeta Was this translation helpful? Give The edge doesn't necessarily need an ID or a key field. Please let me know if I should clarify any of this. Is there anything special I should know since the return type could be either Artist or ArtistDoesNotExist? Since I typically query artist with either slug or id, I use a resolver for the artist node for slug and id.īut I'm not sure what cache.resolve('Query', 'artist', ) will return if I use conditional fragments. 518 6 18 You can also check conditional fragments that works really well with unions Ankit Sharma at 5:22 Add a comment 1 Answer Sorted by: 4 do you have tried directives they may help you in this situation. I wanted to ask: how does this work with a normalized cache? If I have a successful Artist query cached for artist(slug:drake), will that continue to pull from the cache in the future with those variables? So I figured I would use GraphQL's conditional fragments feature. However, I'd like to show a unique UI when the ArtistDoesNotExist, rather than a plain error. I am trying to run a query returning a union type (e.g. Currently, we are throwing an error when this happens. In a raw GraphQL call this would be achieved using conditional fragments like so: query a. I want to query an artist, but also allow for the condition that this artist does not exist.
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