Remove merge request pipeline check in mergeable method

ee/app/models/ee/merge_request.rb

@@ -71,13 +71,6 @@ module EE
       end
     end
 
-    override :mergeable_ci_state?
-    def mergeable_ci_state?
-      return false unless validate_merge_request_pipelines
-
-      super
-    end
-
     def get_on_train!(user)
       create_merge_train!(user: user, target_project: target_project, target_branch: target_branch)
     end
@@ -99,12 +92,6 @@ module EE
       false
     end
 
-    def validate_merge_request_pipelines
-      return true unless project.merge_pipelines_enabled?
-
-      actual_head_pipeline&.latest_merge_request_pipeline?
-    end
-
     def validate_approval_rule_source
       return unless approval_rules.any?
 

ee/changelogs/unreleased/remove-merge-request-pipeline-checkes.yml

+---
+title: Allow merge requests to be merged even when it does not have up-to-date pipeline when merge request pipeline is enabled
+merge_request: 12309
+author:
+type: changed

ee/spec/models/merge_request_spec.rb

@@ -622,64 +622,6 @@ describe MergeRequest do
     end
   end
 
-  describe '#mergeable_ci_state?' do
-    subject { merge_request.mergeable_ci_state? }
-
-    let(:project) { create(:project, :repository) }
-
-    let(:merge_request) do
-      create(:merge_request,
-        :with_merge_request_pipeline,
-        source_branch: 'feature',
-        source_project: project,
-        target_branch: 'master',
-        target_project: project)
-    end
-
-    shared_examples_for 'merge pipelines project option is disabled' do
-      before do
-        project.merge_pipelines_enabled = false
-      end
-
-      it { is_expected.to be_truthy }
-    end
-
-    before do
-      stub_licensed_features(merge_pipelines: true)
-      project.merge_pipelines_enabled = true
-      merge_request.update_head_pipeline
-    end
-
-    it { is_expected.to be_truthy }
-
-    context 'when head pipeline is a detached merge request pipeline' do
-      before do
-        merge_request.head_pipeline.update_column(:target_sha, nil)
-      end
-
-      it { is_expected.to be_falsy }
-      it_behaves_like 'merge pipelines project option is disabled'
-    end
-
-    context 'when source sha of the merge request pipeline is not HEAD' do
-      before do
-        merge_request.head_pipeline.update_column(:source_sha, 'old-commit')
-      end
-
-      it { is_expected.to be_falsy }
-      it_behaves_like 'merge pipelines project option is disabled'
-    end
-
-    context 'when target sha of the merge request pipeline is not HEAD' do
-      before do
-        merge_request.head_pipeline.update_column(:target_sha, 'old-commit')
-      end
-
-      it { is_expected.to be_falsy }
-      it_behaves_like 'merge pipelines project option is disabled'
-    end
-  end
-
   describe '#get_on_train!' do
     subject { merge_request.get_on_train!(user) }