Add pipeline lists to GraphQL

This adds Keyset pagination to GraphQL lists. PoC for that is
pipelines on merge requests and projects.

When paginating a list, the base-64 encoded id of the ordering
field (in most cases the primary key) can be passed in the `before` or
`after` GraphQL argument.

1 files changed, 16 insertions, 0 deletions

diff --git a/app/graphql/resolvers/merge_request_pipelines_resolver.rb b/app/graphql/resolvers/merge_request_pipelines_resolver.rb
new file mode 100644
index 00000000000..00b51ee1381
--- /dev/null
+++ b/app/graphql/resolvers/merge_request_pipelines_resolver.rb
@@ -0,0 +1,16 @@
+module Resolvers
+  class MergeRequestPipelinesResolver < BaseResolver
+    include ::ResolvesPipelines
+
+    alias_method :merge_request, :object
+
+    def resolve(**args)
+      resolve_pipelines(project, args)
+        .merge(merge_request.all_pipelines)
+    end
+
+    def project
+      merge_request.source_project
+    end
+  end
+end