Rails ActiveRecord Create or Find

Question

I\'m working on a Rails 4 App and in my post method for an api i want to find the record based on what the user is trying to create and if it doesn\'t exist create it and if

Answer 1

You can do it as follows,

@picture = current_picture.posts.where(post_id: params[:id]).find_or_create.

This will find post with params[:id] and if it doesn't find that record then it will create record post under current picture with this id.

Answer 2

The Rails 4.0 release notes denote that find_by_ has not been deprecated:

All dynamic methods except for find_by_... and find_by_...! are deprecated.

Additionally, according to the Rails 4.0 documentation, the find_or_create_by method is still available, but has been rewritten to conform to the following syntax:

@picture = current_picture.posts.find_or_create_by(post_id: params[:id])

UPDATE:

According to the source code:

# rails/activerecord/lib/active_record/relation.rb
def find_or_create_by(attributes, &block)
  find_by(attributes) || create(attributes, &block)
end

Thus, it stands to reason that multiple attributes can be passed as arguments to find_or_create_by in Rails 4.