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We are planning use Graphql as backend server in our application. We choose Graphql-Java to develop our POC. We came across a stituation to create our own scalartype to handle java.util.Map object type.
we havent found any documentation regarding creating a custom scalar type. In example code as below
RuntimeWiring buildRuntimeWiring() {
return RuntimeWiring.newRuntimeWiring()
.scalar(CustomScalar)
how to was the implementation done for CustomScalar object. need help.
334
GraphQL's Scalar TypesInt: A signed 32‐bit integer. Float: A signed double-precision floating-point value. String: A UTF‐8 character sequence. Boolean: true or false. ID: The ID scalar type represents a unique identifier, often used to refetch an object or as the key for a cache.
A scalar is a "single" value - integer, boolean, perhaps a string - while a compound is made up of multiple scalars (and possibly references to other compounds). "Scalar" is used in contexts where the relevant distinction is between single/simple/atomic values and compound values.
GraphQL is a cross-platform, open-source, data query, and manipulation language for APIs. GraphQL servers are available for multiple languages such as Java, Python, C#, PHP, R, Haskell, JavaScript, Perl, Ruby, Scala, Go, Elixir, Erlang, and Clojure, etc. So, it can be used with any programming language and framework.
To get a general idea how to make a scalar, just take a look into the existing ones and do something similar.
graphql-java also has a separate project for extra scalars: graphql-java-extended-scalars. And there you can find the object scalar (a.k.a. JSON scalar), that can be used for dynamic structures, like Maps.
Register it via:
RuntimeWiring.newRuntimeWiring().scalar(ExtendedScalars.Object)
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