FIX: Don't enqueue imported users when there're multiple custom fields. (#11559)

My initial implementation didn't consider this case. We should skip imported users if the "imported_id" field is present, even if there're other custom fields.

app/jobs/scheduled/enqueue_suspect_users.rb

@@ -19,9 +19,16 @@ module Jobs
         .where("user_stats.posts_read_count <= 1 AND user_stats.topics_entered <= 1")
         .joins("LEFT OUTER JOIN reviewables r ON r.target_id = users.id AND r.target_type = 'User'")
         .where('r.id IS NULL')
-        .joins('LEFT OUTER JOIN user_custom_fields ucf ON users.id = ucf.user_id')
-        .group('users.id, ucf.id')
-        .having('ucf.id IS NULL OR NOT bool_or(ucf.name = ?)', 'import_id')
+        .joins(
+          <<~SQL
+            LEFT OUTER JOIN (
+              SELECT user_id
+              FROM user_custom_fields
+              WHERE user_custom_fields.name = 'import_id'
+            ) AS ucf ON ucf.user_id = users.id
+          SQL
+        )
+        .where('ucf.user_id IS NULL')
         .limit(10)
 
       users.each do |user|

spec/jobs/enqueue_suspect_users_spec.rb

@@ -80,5 +80,13 @@ describe Jobs::EnqueueSuspectUsers do
 
       expect(ReviewableUser.where(target: suspect_user).exists?).to eq(true)
     end
+
+    it 'ignores imported users even if they have multiple custom fields' do
+      suspect_user.upsert_custom_fields({ field_a: 'value', field_b: 'value', import_id: 'fake_id' })
+
+      subject.execute({})
+
+      expect(ReviewableUser.where(target: suspect_user).exists?).to eq(false)
+    end
   end
 end