Fix implication antecedents with aliases

db/migrate/20131228230219_update_aliased_implication_antecedents.rb

@@ -0,0 +1,19 @@
+class UpdateAliasedImplicationAntecedents < ActiveRecord::Migration
+  def change
+    execute "set statement_timeout = 0"
+    TagImplication.find_each do |ti|
+      ta = TagAlias.where("antecedent_name = ? AND status != ?", ti.antecedent_name, "pending").first
+      if ta
+        if ta.consequent_name == ti.consequent_name
+          ti.destroy
+        elsif TagImplication.where("antecedent_name = ? AND consequent_name = ?", ta.consequent_name, ti.consequent_name).exists?
+          ti.destroy
+        else
+          ti.antecedent_name = ta.consequent_name
+          ti.save
+        end
+        ta.update_posts
+      end
+    end
+  end
+end