Plurals The simplest way to expose a connection between objects is with a field that returns a plural type. There are a number of different ways that these relationships can be exposed in GraphQL, giving a varying set of capabilities to the client developer. Using aliases, you can combine multiple fetches on the same object in a single GraphQL query. A common use case in GraphQL is traversing the relationship between sets of objects. Let’s take a look at two different examples. There are several scenarios where you may want to change the name of the field where you receive query results. In this situation and others, aliases can help you optimize and improve the organization of your queries.
Many developers would be inclined to write separate queries and execute them in independent API calls. For example, let’s say you are trying to fetch the same data by applying various filters. Aliases don’t change the original schema, instead, they manipulate the structure of the query result that is fetched from your database, displaying it according to your specifications.Īliases come in handy when you want to improve the efficiency of your queries. Let’s get started! What are GraphQL aliases?Īliases allow us to rename the data that is returned in a query’s results. Generation of Duplicated Fragments in nested fragments Issue 3063 dotansimha/graphql-code-generator GitHub / Fork 1. We’ll look into several scenarios and expand on this concept with a relevant example. At its core, a fragment is a selection of fields on a specific GraphQL. To shorthand this, GraphQL includes fragments that allow you to wrap a set of fields for reuse across your different queries. In this tutorial, we’ll cover what an alias is, how it works, and when we should use it. Fragments are GraphQL snippets that can be reused throughout your GraphQL operations. In complex applications, you’ll likely have several operations that reference the same fields. In these situations, we can use GraphQL aliases to improve our queries. I am trying to nest fragments (no-recursion or unbounded expansion) in my graphql query. Or, maybe you received two query results in the same server response, causing the field names to clash. listed all the fields and nested fields we want to include in the query. If you’ve used GraphQL for your production application, you may have encountered a scenario where you needed your custom queries to return custom field names. Tomasz, akomy GraphQL allows us to send nested queries, and theres no limit how nested they Some GraphQL queries can take arguments. Listing 6.7 Declaring a GraphQL fragment fragment businessDetails on Business.
Graphql nested fragments software#
ReadInline uses Relay's readInlineData under the hood.Kumar Harsh Follow Technical writer and software developer based in India. Can be used outside of React's render phase. SomeFragment.readInline is a function that takes an object containing a fragment reference for that particular fragment, and returns the fragment data. Your fragment needs to be annotated with for this function to appear. Use uses Relay's useFragment under the hood, which you can read more about here. e is a React hook that takes an object containing a fragment reference for that particular fragment, and returns the fragment data. %relay() is expanded to a module containing the following functions: use With that in mind, Let's jump in to mutations. You cannot nest a Film QueryFragment into a field that was expecting an Actor for. You pass that fragmentReferences prop to the respective fragment's use hooks. QueryFragments are compile time checked against the provided GraphQL schema. This contains references for all fragments that have been spread on that object. Any object where a fragment has been spread will have a prop called fragmentRefs.GraphQL does not support type inheritance or any other mechanism that would reduce the redundancy of having to write out the same fields for different types. A component can use any number of fragments, not just one Fragments are only used on the client-side when making requests - they can't be used inside your schema.They are optimized for performance and help promote well contained and isolated components However, none of them are specific to using Relay with ReScript, so you can read more about them in the Relay documentation below.īefore we move on to the next thing, there's a few things that's worth keeping in mind about fragments: There are a few more concepts around fragments that are worth spending some time to grok. That's a basic introduction to fragments. Fragment UserProfileHeader_user on User make = ( ~ user ) =>
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