Rails custom method

I have a Place model that has both 'city_name' and 'name' as attributes. I would like to define a custom method that finds the place whose name matches the city_name for another place eg.

Place.name = "foo"

Place.city_name = "baz"

then Place.find_city gives the record where Place.name = "baz". At the moment I've got something along the lines of:

def find_city
  Place.find_by_name("this.place.city_name")
end

View:

<%= link_to "#{@place.city_name}", place_path(@place.find_city) %>

This code currently doesn't throw up any errors, but the link simp开发者_如何学运维ly returns the current place record. Is this approach possible, and if so, what would be the best way to go about doing it? Thanks in advance!

---

Try something like this (assuming this method is part of model)

def find_city
  Place.find_by_name(city)
  # param should be either 'city' or 'city_name',
  # I'm confused by your attribute naming
end