7 files changed, 76 insertions, 0 deletions
diff --git a/app/serializers/ci/basic_variable_entity.rb b/app/serializers/ci/basic_variable_entity.rb
new file mode 100644
index 00000000000..dad59e8735b
--- /dev/null
+++ b/app/serializers/ci/basic_variable_entity.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Ci
+  class BasicVariableEntity < Grape::Entity
+    expose :id
+    expose :key
+    expose :value
+    expose :variable_type
+
+    expose :protected?, as: :protected
+    expose :masked?, as: :masked
+  end
+end
diff --git a/app/serializers/ci/dag_job_entity.rb b/app/serializers/ci/dag_job_entity.rb
new file mode 100644
index 00000000000..b4947319ed1
--- /dev/null
+++ b/app/serializers/ci/dag_job_entity.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Ci
+  class DagJobEntity < Grape::Entity
+    expose :name
+
+    expose :needs, if: -> (job, _) { job.scheduling_type_dag? } do |job|
+      job.needs.pluck(:name) # rubocop: disable CodeReuse/ActiveRecord
+    end
+  end
+end
diff --git a/app/serializers/ci/dag_job_group_entity.rb b/app/serializers/ci/dag_job_group_entity.rb
new file mode 100644
index 00000000000..ac1ed89281c
--- /dev/null
+++ b/app/serializers/ci/dag_job_group_entity.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Ci
+  class DagJobGroupEntity < Grape::Entity
+    expose :name
+    expose :size
+    expose :jobs, with: Ci::DagJobEntity
+  end
+end
diff --git a/app/serializers/ci/dag_pipeline_entity.rb b/app/serializers/ci/dag_pipeline_entity.rb
new file mode 100644
index 00000000000..b615dd2b194
--- /dev/null
+++ b/app/serializers/ci/dag_pipeline_entity.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Ci
+  class DagPipelineEntity < Grape::Entity
+    expose :ordered_stages_with_preloads, as: :stages, using: Ci::DagStageEntity
+
+    private
+
+    def ordered_stages_with_preloads
+      object.ordered_stages.preload(preloaded_relations) # rubocop: disable CodeReuse/ActiveRecord
+    end
+
+    def preloaded_relations
+      [
+        :project,
+        { latest_statuses: :needs }
+      ]
+    end
+  end
+end
diff --git a/app/serializers/ci/dag_pipeline_serializer.rb b/app/serializers/ci/dag_pipeline_serializer.rb
new file mode 100644
index 00000000000..0c9e9a9db69
--- /dev/null
+++ b/app/serializers/ci/dag_pipeline_serializer.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module Ci
+  class DagPipelineSerializer < BaseSerializer
+    entity Ci::DagPipelineEntity
+  end
+end
diff --git a/app/serializers/ci/dag_stage_entity.rb b/app/serializers/ci/dag_stage_entity.rb
new file mode 100644
index 00000000000..c7969da6c3c
--- /dev/null
+++ b/app/serializers/ci/dag_stage_entity.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Ci
+  class DagStageEntity < Grape::Entity
+    expose :name
+
+    expose :groups, with: Ci::DagJobGroupEntity
+  end
+end
diff --git a/app/serializers/ci/instance_variable_serializer.rb b/app/serializers/ci/instance_variable_serializer.rb
new file mode 100644
index 00000000000..b0b49aecdbd
--- /dev/null
+++ b/app/serializers/ci/instance_variable_serializer.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module Ci
+  class InstanceVariableSerializer < BaseSerializer
+    entity BasicVariableEntity
+  end
+end