moebooru/db/migrate/015_rename_implication_fields.rb

class RenameImplicationFields < ActiveRecord::Migration[5.1]
  def self.up
    execute "ALTER TABLE tag_implications RENAME COLUMN parent_id TO consequent_id"
    execute "ALTER TABLE tag_implications RENAME COLUMN child_id TO predicate_id"
  end

  def self.down
    execute "ALTER TABLE tag_implications RENAME COLUMN consequent_id TO parent_id"
    execute "ALTER TABLE tag_implications RENAME COLUMN predicate_id TO child_id"
  end
end