Merge pull request #744 from code0-tech/741-add-support-for-username-in-queryuser

Add username to users query

Author: Taucher2003

app/graphql/types/query_type.rb

@@ -41,7 +41,11 @@ class QueryType < Types::BaseObject
     end
 
     field :user, Types::UserType, null: true, description: 'Find a user' do
-      argument :id, Types::GlobalIdType[::User], required: true, description: 'GlobalID of the target user'
+      argument :id, Types::GlobalIdType[::User], required: false, description: 'GlobalID of the target user'
+
+      argument :username, GraphQL::Types::String, required: false, description: 'Username of the target user'
+
+      require_one_of %i[id username]
     end
 
     field :users, Types::UserType.connection_type, null: false, description: 'Find users'
@@ -89,8 +93,12 @@ def namespace(id:)
       SagittariusSchema.object_from_id(id)
     end
 
-    def user(id:)
-      SagittariusSchema.object_from_id(id)
+    def user(id: nil, username: nil)
+      if id.present?
+        SagittariusSchema.object_from_id(id)
+      elsif username.present?
+        User.find_by(username: username)
+      end
     end
 
     def users

docs/graphql/object/query.md

@@ -77,4 +77,5 @@ Returns [`User`](../object/user.md).
 
 | Name | Type | Description |
 |------|------|-------------|
-| `id` | [`UserID!`](../scalar/userid.md) | GlobalID of the target user |
+| `id` | [`UserID`](../scalar/userid.md) | GlobalID of the target user |
+| `username` | [`String`](../scalar/string.md) | Username of the target user |