Ignore sorting parameter when exporting issues to CSV

doc/user/project/issues/csv_export.md

@@ -36,6 +36,10 @@ You will be asked to confirm the number of issues and email address for the expo
 
 ![CSV export modal dialog](img/csv_export_modal.png)
 
+## Sorting
+
+Exported issues are always sorted by `Issue ID`.
+
 ## Format
 
 > **Time Estimate** and **Time Spent** columns were [introduced](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2627) in GitLab Starter 10.0.

ee/app/workers/export_csv_worker.rb

@@ -5,9 +5,11 @@ class ExportCsvWorker
     @current_user = User.find(current_user_id)
     @project = Project.find(project_id)
 
+    params.symbolize_keys!
     params[:project_id] = project_id
+    params.delete(:sort)
 
-    issues = IssuesFinder.new(@current_user, params.symbolize_keys).execute
+    issues = IssuesFinder.new(@current_user, params).execute
 
     Issues::ExportCsvService.new(issues).email(@current_user, @project)
   end

ee/changelogs/unreleased/fix-csv-labels.yml

+---
+title: Fix exporting issues to CSV when sorting by label priority is used.
+merge_request:
+author:
+type: fixed

ee/spec/features/issues/csv_spec.rb

@@ -5,7 +5,7 @@ describe 'Issues csv' do
   let(:project) { create(:project, :public) }
   let(:milestone) { create(:milestone, title: 'v1.0', project: project) }
   let(:idea_label) { create(:label, project: project, title: 'Idea') }
-  let(:feature_label) { create(:label, project: project, title: 'Feature') }
+  let(:feature_label) { create(:label, project: project, title: 'Feature', priority: 10) }
   let!(:issue)  { create(:issue, project: project, author: user) }
 
   before do
@@ -67,6 +67,15 @@ describe 'Issues csv' do
     expect(csv.count).to eq 0
   end
 
+  it 'ignores sorting from issue index' do
+    issue2 = create(:labeled_issue, project: project, author: user, labels: [feature_label])
+
+    request_csv(sort: :label_priority)
+
+    expected = [issue.iid.to_s, issue2.iid.to_s]
+    expect(csv.map { |row| row['Issue ID'] }).to eq expected
+  end
+
   it 'uses array filters, such as label_name' do
     issue.update!(labels: [idea_label])
 

ee/spec/workers/export_csv_worker_spec.rb

@@ -18,6 +18,12 @@ describe ExportCsvWorker do
     perform
   end
 
+  it 'removes sort parameter' do
+    expect(IssuesFinder).to receive(:new).with(anything, hash_not_including(:sort)).and_call_original
+
+    perform
+  end
+
   it 'converts controller string keys to symbol keys for IssuesFinder' do
     expect(IssuesFinder).to receive(:new).with(anything, hash_including(test_key: true)).and_call_original