CODEWITHSUNDEEP
ruby-on-railsactiverecord
ironsand
ironsand

Reputation: 15141

Can't use `find_by` method while `where` works in ActiveRecord::Base

I have a method like this, that works fine.

class User < ActiveRecord::Base
    def self.find_or_create_from_twitter_id(twitter_id)
        user = where(twitter_id: twitter_id).first
        user ||= create_from_twitter_id(twitter_id)
    end
end

Then I changed where(...).first to find_by, because I thought the two expression are basically same.

def self.find_or_create_from_twitter_id(twitter_id)
    user = find_by(twitter_id: twitter_id)
    user ||= create_from_twitter_id(twitter_id)
end

But I get undefined method `find_by' for #<Class:0x007fbb2b674970> error when I try to create a User.

I have no idea why find_by doesn't work here. I'll be very grateful if you tell me what is wrong.

Upvotes: 0

Views: 53

Answers (1)

Surya
Surya

Reputation: 15992

find_by method is introduced in Rails 4. If you're using Rails 3.x or lesser version then use: find_by_<attribute_name> instead:

find_by_twitter_id(twitter_id)

But, then there's another method which find and create by the attributes passed to it, which you can use if it fits your needs:

find_or_create_by_twitter_id(twitter_id)

Upvotes: 2

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