CV2-4918: migrate claims without fact-checks (#1970)

* CV2-4918: migrate claims without fact-checks

* CV2-4918: set default columns for FactCheck to avoid validation errors

lib/tasks/migrate/20240725173311_migrate_claims_without_fact_checks.rake

@@ -0,0 +1,34 @@
+namespace :check do
+  namespace :migrate do
+    task migrate_claims_without_fact_checks: :environment do
+      started = Time.now.to_i
+      last_cd_id = Rails.cache.read('check:migrate:migrate_claims_without_fact_checks:claim_description_id') || 0
+      ClaimDescription.where('claim_descriptions.id > ?', last_cd_id)
+      .joins("LEFT JOIN fact_checks fc ON claim_descriptions.id = fc.claim_description_id")
+      .where('fc.id IS NULL').find_in_batches(batch_size: 2500) do |cds|
+        print '.'
+        fc_items = []
+        # Get default language for claim description team
+        team_ids = cds.map(&:team_id).uniq
+        team_language = {}
+        Team.where(id: team_ids).find_each{|t| team_language[t.id] = t.default_language }
+        cds.each do |cd|
+          fc_items << {
+            claim_description_id: cd.id,
+            user_id: cd.user_id,
+            summary: '-',
+            title: '-',
+            language: team_language[cd.team_id],
+            created_at: cd.created_at,
+            updated_at: cd.updated_at
+          }
+        end
+        FactCheck.insert_all(fc_items)
+        max_id = cds.map(&:id).max
+        Rails.cache.write('check:migrate:migrate_claims_without_fact_checks:claim_description_id', max_id)
+      end
+      minutes = ((Time.now.to_i - started) / 60).to_i
+      puts "[#{Time.now}] Done in #{minutes} minutes."
+    end
+  end
+end