1 files changed, 63 insertions, 0 deletions
diff --git a/app/graphql/mutations/merge_requests/create.rb b/app/graphql/mutations/merge_requests/create.rb
new file mode 100644
index 00000000000..e210987f259
--- /dev/null
+++ b/app/graphql/mutations/merge_requests/create.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class Create < BaseMutation
+      include ResolvesProject
+
+      graphql_name 'MergeRequestCreate'
+
+      argument :project_path, GraphQL::ID_TYPE,
+               required: true,
+               description: 'Project full path the merge request is associated with'
+
+      argument :title, GraphQL::STRING_TYPE,
+               required: true,
+               description: copy_field_description(Types::MergeRequestType, :title)
+
+      argument :source_branch, GraphQL::STRING_TYPE,
+               required: true,
+               description: copy_field_description(Types::MergeRequestType, :source_branch)
+
+      argument :target_branch, GraphQL::STRING_TYPE,
+               required: true,
+               description: copy_field_description(Types::MergeRequestType, :target_branch)
+
+      argument :description, GraphQL::STRING_TYPE,
+               required: false,
+               description: copy_field_description(Types::MergeRequestType, :description)
+
+      field :merge_request,
+            Types::MergeRequestType,
+            null: true,
+            description: 'The merge request after mutation'
+
+      authorize :create_merge_request_from
+
+      def resolve(project_path:, title:, source_branch:, target_branch:, description: nil)
+        project = authorized_find!(full_path: project_path)
+
+        attributes = {
+          title: title,
+          source_branch: source_branch,
+          target_branch: target_branch,
+          author_id: current_user.id,
+          description: description
+        }
+
+        merge_request = ::MergeRequests::CreateService.new(project, current_user, attributes).execute
+
+        {
+          merge_request: merge_request.valid? ? merge_request : nil,
+          errors: errors_on_object(merge_request)
+        }
+      end
+
+      private
+
+      def find_object(full_path:)
+        resolve_project(full_path: full_path)
+      end
+    end
+  end
+end