// Mutation should be null UNLESS adding a mutation at the schema level
internal GraphQLFieldBuilder <TContext, TField> AddListFieldInternal <TArgs, TField>(string name, Func <TArgs, Expression <Func <TContext, TEntity, IEnumerable <TField> > > > exprFunc)
{
var field = GraphQLField.New(_schema, name, exprFunc, typeof(IEnumerable <TField>), _type);
_type.OwnFields.Add(field);
return(new GraphQLFieldBuilder <TContext, TField>(field));
}
// unsafe generic magic to create a GQLField instance
private GraphQLField CreateGenericField(PropertyInfo prop)
{
// build selector expression, e.g.: (db, p) => p.Id
var entityParam = Expression.Parameter(typeof(TEntity), "p");
var memberExpr = Expression.MakeMemberAccess(entityParam, prop);
var lambda = Expression.Lambda(memberExpr, GraphQLSchema <TContext> .DbParam, entityParam);
// build args func wrapping selector expression, e.g. o => (db, p) => p.Id
var objectParam = Expression.Parameter(typeof(object), "o");
var argsExpr = Expression.Lambda(Expression.Quote(lambda), objectParam);
var exprFunc = argsExpr.Compile();
return(GraphQLField.New(_schema, prop.Name.ToCamelCase(), (Func <object, LambdaExpression>)exprFunc, prop.PropertyType, _type));
}
