Rails通过belongs_to关系方法查询

Question

I have a model Location which many models use to store geographic-type information. I am using https://github.com/alexreisner/geocoder to filter results based on location. My issue is, how do I call the .near method on the belongs_to location. Example:

I have a User

class User < ActiveRecord::Base
  belongs_to :location
end

Location:

class Location < ActiveRecord::Base
end

I would normally join Location and query from there:

User.joins(:location).where('locations.country = ""')

The issue is, I can not pass a hash or a string, I need to call a method from Location, something like

# Instead of calling .near on User, I need to on Location
User.joins(:location).near('Omaha, NE, US', 20)

I am not sure how I can do this, or if it is possible. Thanks

Answer 1

You can query on Location with a join on User , even without a relation defined from Location to User , and get the id of the users :

users_id = Location.join('INNER JOIN users ON users.location_id = locations.id').near('Omaha, NE, US', 20).pluck('users.id')
users = User.find(users_id)