Fix 'Object not found - no match for id (sha)' when importing GitHub PRs

lib/gitlab/github_import/branch_formatter.rb

@@ -18,7 +18,7 @@ module Gitlab
       end
 
       def commit_exists?
-        project.repository.commit(sha).present?
+        project.repository.branch_names_contains(sha).include?(ref)
       end
 
       def short_id

spec/lib/gitlab/github_import/branch_formatter_spec.rb

@@ -6,27 +6,27 @@ describe Gitlab::GithubImport::BranchFormatter, lib: true do
   let(:repo) { double }
   let(:raw) do
     {
-      ref: 'feature',
+      ref: 'branch-merged',
       repo: repo,
       sha: commit.id
     }
   end
 
   describe '#exists?' do
-    it 'returns true when both branch, and commit exists' do
+    it 'returns true when branch exists and commit is part of the branch' do
       branch = described_class.new(project, double(raw))
 
       expect(branch.exists?).to eq true
     end
 
-    it 'returns false when branch does not exist' do
-      branch = described_class.new(project, double(raw.merge(ref: 'removed-branch')))
+    it 'returns false when branch exists and commit is not part of the branch' do
+      branch = described_class.new(project, double(raw.merge(ref: 'feature')))
 
       expect(branch.exists?).to eq false
     end
 
-    it 'returns false when commit does not exist' do
-      branch = described_class.new(project, double(raw.merge(sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b')))
+    it 'returns false when branch does not exist' do
+      branch = described_class.new(project, double(raw.merge(ref: 'removed-branch')))
 
       expect(branch.exists?).to eq false
     end

spec/lib/gitlab/github_import/importer_spec.rb

@@ -130,7 +130,7 @@ describe Gitlab::GithubImport::Importer, lib: true do
     let!(:user) { create(:user, email: octocat.email) }
     let(:repository) { double(id: 1, fork: false) }
     let(:source_sha) { create(:commit, project: project).id }
-    let(:source_branch) { double(ref: 'feature', repo: repository, sha: source_sha) }
+    let(:source_branch) { double(ref: 'branch-merged', repo: repository, sha: source_sha) }
     let(:target_sha) { create(:commit, project: project, git_commit: RepoHelpers.another_sample_commit).id }
     let(:target_branch) { double(ref: 'master', repo: repository, sha: target_sha) }
     let(:pull_request) do

spec/lib/gitlab/github_import/pull_request_formatter_spec.rb

@@ -7,7 +7,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
   let(:target_sha) { create(:commit, project: project, git_commit: RepoHelpers.another_sample_commit).id }
   let(:repository) { double(id: 1, fork: false) }
   let(:source_repo) { repository }
-  let(:source_branch) { double(ref: 'feature', repo: source_repo, sha: source_sha) }
+  let(:source_branch) { double(ref: 'branch-merged', repo: source_repo, sha: source_sha) }
   let(:target_repo) { repository }
   let(:target_branch) { double(ref: 'master', repo: target_repo, sha: target_sha) }
   let(:removed_branch) { double(ref: 'removed-branch', repo: source_repo, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b') }
@@ -49,7 +49,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
           title: 'New feature',
           description: "*Created by: octocat*\n\nPlease pull these awesome changes",
           source_project: project,
-          source_branch: 'feature',
+          source_branch: 'branch-merged',
           source_branch_sha: source_sha,
           target_project: project,
           target_branch: 'master',
@@ -75,7 +75,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
           title: 'New feature',
           description: "*Created by: octocat*\n\nPlease pull these awesome changes",
           source_project: project,
-          source_branch: 'feature',
+          source_branch: 'branch-merged',
           source_branch_sha: source_sha,
           target_project: project,
           target_branch: 'master',
@@ -102,7 +102,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
           title: 'New feature',
           description: "*Created by: octocat*\n\nPlease pull these awesome changes",
           source_project: project,
-          source_branch: 'feature',
+          source_branch: 'branch-merged',
           source_branch_sha: source_sha,
           target_project: project,
           target_branch: 'master',
@@ -194,7 +194,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
       let(:raw_data) { double(base_data) }
 
       it 'returns branch ref' do
-        expect(pull_request.source_branch_name).to eq 'feature'
+        expect(pull_request.source_branch_name).to eq 'branch-merged'
       end
     end
 
@@ -208,7 +208,7 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
   end
 
   shared_examples 'Gitlab::GithubImport::PullRequestFormatter#target_branch_name' do
-    context 'when source branch exists' do
+    context 'when target branch exists' do
       let(:raw_data) { double(base_data) }
 
       it 'returns branch ref' do