Ruby on Rails

rails 3.2.11

I have models

Airport
:name, :string
belongs_to city
City
:name, :string
has_many airports
belongs_to country
Country
:name, :string
has_many cities

and I want to search a particular airport through this association

scope :search_airport, where(:name => name, :city => city, :country =>
country)

clearly this does not work

Could anyone show me how to set up a scope through association?

the input maybe only airport name, or airport name with city, or airport
name with city and country name.

soichi

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