UX: use "icon-picker" & "image-uploader" fields to set group flair. (#9779)

db/migrate/20200511043818_add_more_flair_columns_to_group.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class AddMoreFlairColumnsToGroup < ActiveRecord::Migration[6.0]
+  def change
+    add_column :groups, :flair_icon, :string
+    add_column :groups, :flair_upload_id, :integer
+
+    reversible do |dir|
+      dir.up do
+        DB.exec(
+          <<~SQL
+            UPDATE groups SET flair_icon = REPLACE(REPLACE(flair_url, 'fas fa-', ''), ' fa-', '-')
+            WHERE flair_url LIKE 'fa%'
+          SQL
+        )
+
+        DB.exec(
+          <<~SQL
+            UPDATE groups g1
+            SET flair_upload_id = u.id
+            FROM groups g2
+            INNER JOIN uploads u ON g2.flair_url ~ CONCAT('\/', u.sha1, '[\.\w]*')
+            WHERE g1.id = g2.id
+          SQL
+        )
+
+        DB.exec(
+          <<~SQL
+            UPDATE groups SET flair_url = NULL
+            WHERE flair_icon IS NOT NULL OR flair_upload_id IS NOT NULL
+          SQL
+        )
+      end
+    end
+  end
+end