Fixed filter by label for issues CSV export

app/controllers/concerns/issuable_collections.rb

@@ -81,7 +81,7 @@ module IssuableCollections
       # @filter_params[:authorized_only] = true
     end
 
-    @filter_params
+    @filter_params.permit(IssuableFinder::VALID_PARAMS)
   end
 
   def set_default_scope

app/controllers/projects/issues_controller.rb

@@ -146,8 +146,7 @@ class Projects::IssuesController < Projects::ApplicationController
   end
 
   def export_csv
-    csv_params = filter_params.permit(IssuableFinder::VALID_PARAMS)
-    ExportCsvWorker.perform_async(@current_user.id, @project.id, csv_params)
+    ExportCsvWorker.perform_async(@current_user.id, @project.id, filter_params)
 
     index_path = namespace_project_issues_path(@project.namespace, @project)
     redirect_to(index_path, notice: "Your CSV export has started. It will be emailed to #{current_user.notification_email} when complete.")

app/finders/issuable_finder.rb

@@ -20,7 +20,10 @@
 #
 class IssuableFinder
   NONE = '0'.freeze
-  VALID_PARAMS = %i(scope state group_id project_id milestone_title assignee_id search label_name sort assignee_username author_id author_username authorized_only due_date iids non_archived weight).freeze
+
+  SCALAR_PARAMS = %i(scope state group_id project_id milestone_title assignee_id search label_name sort assignee_username author_id author_username authorized_only due_date iids non_archived weight).freeze
+  ARRAY_PARAMS = { label_name: [], iids: [] }.freeze
+  VALID_PARAMS = (SCALAR_PARAMS + [ARRAY_PARAMS]).freeze
 
   attr_accessor :current_user, :params
 

app/views/projects/issues/export_issues/_csv_download.html.haml

@@ -17,4 +17,4 @@
           %strong= @current_user.notification_email
           in an attachment.
       .modal-footer
-        = link_to 'Export issues', export_csv_namespace_project_issues_path(@project.namespace, @project, params.permit(IssuableFinder::VALID_PARAMS)), method: :post, class: 'btn btn-success pull-left', title: 'Export issues'
+        = link_to 'Export issues', export_csv_namespace_project_issues_path(@project.namespace, @project, request.query_parameters), method: :post, class: 'btn btn-success pull-left', title: 'Export issues'

spec/features/issues/csv_spec.rb

@@ -63,6 +63,14 @@ describe 'Issues csv', feature: true do
     expect(csv.count).to eq 0
   end
 
+  it 'uses array filters, such as label_name' do
+    issue.update!(labels: [idea_label])
+
+    request_csv("label_name[]" => 'Bug')
+
+    expect(csv.count).to eq 0
+  end
+
   it 'avoids excessive database calls' do
     control_count = ActiveRecord::QueryRecorder.new{ request_csv }.count
     create_list(:labeled_issue,