如何使用Rails和Postgresql将匹配的记录另存为新记录并更新user_id

Question

I am matching incomplete and complete records using postgresql in rails. Here's the matching code:

QualifyingEvent.where("(class_date = :class_date AND course_id = :course_id) 
                    OR (class_date = :class_date AND sponsor_name = :sponsor_name) 
                    OR (course_id = :course_id AND sponsor_name = :sponsor_name)",
                      class_date: '2001-01-01',
                      course_id: 'A111',
                      sponsor_name: 'ICPAS').first

I want to save a duplicate of the matched record with the current_user's user_id. I'm currently using a convoluted work-around where I set a variable, ie, abc = match, and then parse the match, ie, user_id = abc.user_id, so that I can create a new QualifyingEvent with the params, eg, :class_date, :course_id, :sponsor_name, and :user_id

I tried abc = QualifyingEvent.new and then abc = match and abc.save. It didn't work.

There must be an easier way?! Thank you in advance for your help.

Answer 1

I tried abc = QualifyingEvent.new and then abc = match and abc.save. It didn't work.

That would make one object equal to another object whereas what you are really wanting to do is just assign the attributes of one object to another object

abc = QualifyingEvent.new
abc.assign_attributes(match.attributes)

Then sort out the current_user id to whatever value you want plus set the date/time stamps for created_at, updated_a and the id to nil as Rails and the RDBMS will take care of those values when record is saved.

Also to get around the mass assignment protection you can use the :without_protection => true argument

abc.assign_attributes(match.attributes, :without_protection => true)

see the docs for more info http://apidock.com/rails/ActiveRecord/Base/assign_attributes