GraphQL Fundamentals

37. © 2021 GraphQL Page | 37 • In GraphQL, you can use variables to reuse the same query/mutations written by the client, with different arguments. • When we start working with variables, we need to do three things: – Replace the static value in the query with $variableName – Declare $variableName as one of the variables accepted by the query – Pass variableName: value in the separate, transport-speciﬁc (usually JSON) variables dictionary

39. © 2021 GraphQL Page | 39 • A GraphQL fragment is a piece of logic that a client can share between multiple queries and mutations. • In GraphQL, you often need to query for the same data ﬁelds in different queries. • By reusing this code, we can be more efﬁcient with our time and reuse these piece of queries

42. © 2021 GraphQL Page | 42 Almost impossible to solve ● Query In Indefinite Depth – GraphQL cannot query in indefinite depth, so if you have a tree and want to return a branch without knowing the depth, you’ll have to do some pagination ● Specific Response Structure – In GraphQL the response matches the shape of the query, so if you need to respond in a very specific structure, you'll have to add a transformation layer to reshape the response.

43. © 2021 GraphQL Page | 43 Hard to solve ● Cache at Network Level – Because of the commonly way GraphQL is used over HTTP (A POST in a single endpoint), cache at network level becomes hard. A way to solve it is to use Persisted Queries. ● Handling File Upload – There is nothing about file upload in the GraphQL specification and mutations doesn’t accept files in the arguments. To solve it you can upload files using other kind of APIs (like REST) and pass the URL of the uploaded file to the GraphQL mutation, or inject the file in the execution context, so you’ll have the file inside the resolver functions.

GraphQL Fundamentals

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GraphQL Fundamentals

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GraphQL Fundamentals