This library implements generating GraphQL Schema based on tagged structs using the github.com/graphql-go/graphql implementation.
Usually, building the schema is a one time task and it is done statically. So, this library does not degrade the performance, not even a little, but in that one-time initialization.
Check the examples in the /examples folder.
The default data types of the GraphQL can be count in one hand, which is not a bad thing. However, that means that you may need to implement some scalar types (or event complexes types) yourself.
In order to provide custom types for the fields the GraphqlTyped
interface was defined:
type GraphqlTyped interface {
GraphqlType() graphql.Type
}An example:
type TypeA string
func (*TypeA) GraphqlType() graphql.Type {
return graphql.Int
}Remember, this library is all about declaring the schema. If you need
marshalling/unmarshaling a custom type to another, use the implementation
of the github.com/graphql-go/graphql
library (check on the graphql.NewScalar and graphql.ScalarConfig).
To implement resolvers over a Custom Type, you will implement the
interface GraphqlResolver:
type GraphqlResolver interface {
GraphqlResolve(p graphql.ResolveParams) (interface{}, error)
}IMPORTANT: Although the method GraphqlResolve is a member of a struct, it is
called statically. So, do not make any references of the struct itself,
inside of this method.
An example:
type TypeA string
func (*TypeA) GraphqlType() graphql.Type {
return graphql.Int
}- This library do not deal with arrays yet.
MIT