change LtiParameters Table

db/migrate/20161216130605_remove_lti_return_url_from_lti_parameter.rb

@@ -0,0 +1,5 @@
+class RemoveLtiReturnUrlFromLtiParameter < ActiveRecord::Migration
+  def change
+    remove_column :lti_parameters, :lti_return_url, :text
+  end
+end

db/migrate/20161216131239_add_lti_parameters_to_lti_parameter.rb

@@ -0,0 +1,5 @@
+class AddLtiParametersToLtiParameter < ActiveRecord::Migration
+  def change
+    add_column :lti_parameters, :lti_parameters, :json
+  end
+end