New migration to add better auditing to user_roles and better column names there and on user_blocks. Added a helper for displaying block status messages.

db/migrate/046_alter_user_roles_and_blocks.rb

@@ -0,0 +1,29 @@
+require 'lib/migrate'
+
+class AlterUserRolesAndBlocks < ActiveRecord::Migration
+  def self.up
+    # the initial granter IDs can be "self" - there are none of these
+    # in the current live DB, but there may be some in people's own local
+    # copies.
+    add_column :user_roles, :granter_id, :bigint
+    UserRole.update_all("granter_id = user_id")
+    change_column :user_roles, :granter_id, :bigint, :null => false
+    add_foreign_key :user_roles, [:granter_id], :users, [:id]
+
+    # make sure that [user_id, role] is unique
+    add_index :user_roles, [:user_id, :role], :name => "user_roles_id_role_unique", :unique => true
+
+    # change the user_blocks to have a creator_id rather than moderator_id
+    rename_column :user_blocks, :moderator_id, :creator_id
+
+    # change the "end_at" column to the more grammatically correct "ends_at"
+    rename_column :user_blocks, :end_at, :ends_at
+  end
+
+  def self.down
+    remove_column :user_roles, :granter_id
+    remove_index :user_roles, :name => "user_roles_id_role_unique"
+    rename_column :user_blocks, :creator_id, :moderator_id
+    rename_column :user_blocks, :ends_at, :end_at
+  end
+end