Rails find or create based on two fields

I hav开发者_开发问答e a venue model and i want to do this

Venue.find_or_create_by_

but i only want a new venue to be created if one with the same name and date do not already exist

For example

=> Venue(id: integer, location: string, showdate: datetime, created_at: datetime, updated_at: datetime)

A venue is unique and needs to be created if the location and the showdate are not present in the db

---

You can chain columns together by using _and_. This should do the trick:

Venue.find_or_create_by_location_and_showdate(location, showdate)

---

In rails 4 you would do:

Venue.find_or_create_by(location: location, showdate: showdate)

Much prettier, if you ask me!

---

my_class = ClassName.find_or_initialize_by_showdate_and_location(showdate,location)
my_class.update_attributes!

find_or_initialize method find by name and location in database. If record doesn't exist than it initialize new record with showdate and location. http://api.rubyonrails.org/classes/ActiveRecord/Base.html This link will help you to figure out find_or_initialize and find_or_create.