protected virtual UnionGraphType ToUnionType(GraphQLUnionTypeDefinition unionDef)
{
var name = (string)unionDef.Name.Value;
var typeConfig = Types.For(name);
AssertKnownType(typeConfig);
var type = new UnionGraphType
{
Name = name,
Description = typeConfig.Description ?? unionDef.Description?.Value.ToString() ?? unionDef.Comment?.Text.ToString(),
ResolveType = typeConfig.ResolveType,
}.SetAstType(unionDef);
OverrideDeprecationReason(type, typeConfig.DeprecationReason);
typeConfig.CopyMetadataTo(type);
if (unionDef.Types?.Count > 0) // just in case
{
foreach (var x in unionDef.Types)
{
string n = (string)x.Name.Value;
type.AddPossibleType((GetType(n) ?? new GraphQLTypeReference(n)) as IObjectGraphType);
}
}
return(type);
}
private UnionGraphType BuildEntityGraphType(ISchema schema)
{
var union = new UnionGraphType
{
Name = "_Entity",
Description = "A union of all types that use the @key directive"
};
var entities = _types.Values.Where(IsEntity).Select(x => x as IObjectGraphType).ToList();
foreach (var e in entities)
{
union.AddPossibleType(e);
}
union.ResolveType = x =>
{
if (x is Dictionary <string, object> dict)
{
if (dict.TryGetValue("__typename", out object typeName))
{
return(new GraphQLTypeReference(typeName.ToString()));
}
}
// TODO: Provide another way to give graph type name, such as an attribute
return(new GraphQLTypeReference(x.GetType().Name));
};
return(union);
}
public void build_union()
{
var schema = new Schema();
var person = new ObjectGraphType {
Name = "Person"
};
person.Field("name", new StringGraphType());
person.IsTypeOf = type => true;
var robot = new ObjectGraphType {
Name = "Robot"
};
robot.Field("name", new StringGraphType());
robot.IsTypeOf = type => true;
var personOrRobot = new UnionGraphType {
Name = "PersonOrRobot"
};
personOrRobot.AddPossibleType(person);
personOrRobot.AddPossibleType(robot);
var root = new ObjectGraphType {
Name = "Root"
};
root.Field("hero", personOrRobot, resolve: ctx => ctx.RootValue);
schema.Query = root;
AssertQuerySuccess(
schema,
@"{ hero {
... on Person { name }
... on Robot { name }
} }",
@"{ hero: { name : 'Quinn' }}",
root: new SomeObject {
Name = "Quinn"
});
}
protected virtual UnionGraphType ToUnionType(GraphQLUnionTypeDefinition unionDef)
{
var typeConfig = Types.For(unionDef.Name.Value);
var type = new UnionGraphType();
type.Name = unionDef.Name.Value;
type.Description = typeConfig.Description;
type.ResolveType = typeConfig.ResolveType;
CopyMetadata(type, typeConfig);
var possibleTypes = unionDef.Types.Select(x => GetType(x.Name.Value));
possibleTypes.Apply(x => type.AddPossibleType(x as IObjectGraphType));
return(type);
}
protected virtual UnionGraphType ToUnionType(GraphQLUnionTypeDefinition unionDef)
{
var typeConfig = Types.For(unionDef.Name.Value);
var type = new UnionGraphType
{
Name = unionDef.Name.Value,
Description = typeConfig.Description ?? unionDef.Comment?.Text,
ResolveType = typeConfig.ResolveType
};
CopyMetadata(type, typeConfig);
var possibleTypes = unionDef.Types.Select(x => GetType(x.Name.Value) ?? new GraphQLTypeReference(x.Name.Value));
possibleTypes.Apply(x => type.AddPossibleType(x as IObjectGraphType));
return(type);
}
protected virtual UnionGraphType ToUnionType(GraphQLUnionTypeDefinition unionDef)
{
var typeConfig = Types.For(unionDef.Name.Value);
var type = new UnionGraphType
{
Name = unionDef.Name.Value,
Description = typeConfig.Description,
ResolveType = typeConfig.ResolveType
};
ApplyDeprecatedDirective(unionDef.Directives, reason =>
{
type.DeprecationReason = typeConfig.DeprecationReason ?? reason;
});
CopyMetadata(type, typeConfig);
var possibleTypes = unionDef.Types.Select(x => GetType(x.Name.Value));
possibleTypes.Apply(x => type.AddPossibleType(x as IObjectGraphType));
return(type);
}