add db migration to cleanup default avatar image-urls

closes #6014

Changelog.md

@@ -51,6 +51,7 @@
 * Fix tag rendering in emails [#6009](https://github.com/diaspora/diaspora/pull/6009)
 * Fix the logo in emails [#6013](https://github.com/diaspora/diaspora/pull/6013)
 * Disable autocorrect for username on mobile sign in [#6028](https://github.com/diaspora/diaspora/pull/6028)
+* Fix broken default avatars in the database [#6014](https://github.com/diaspora/diaspora/pull/6014)
 
 ## Features
 * Hide post title of limited post in comment notification email [#5843](https://github.com/diaspora/diaspora/pull/5843)

db/migrate/20150531005120_cleanup_default_avatars.rb

@@ -0,0 +1,10 @@
+class CleanupDefaultAvatars < ActiveRecord::Migration
+  def up
+    Profile.where("image_url LIKE ?", "%user/default%")
+      .update_all(image_url: nil, image_url_small: nil, image_url_medium: nil)
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150403212139) do
+ActiveRecord::Schema.define(version: 20150531005120) do
 
   create_table "account_deletions", force: :cascade do |t|
     t.string   "diaspora_handle", limit: 255