RGeo column is deserialized as RGeo::Geos::CAPIPointImpl instead of RGeo::Geographic::SphericalPointImpl

[Yevhenii Kurtov]

There is an `Address` table with coordinates column

class CreateAddresses < ActiveRecord::Migration

  def change

    create_table :addresses do |t|

     #...

      t.st_point :coordinates,   geographic: true, srid: 4326

    end

    add_index :addresses, :coordinates, using: :gist

  end

end

and method which is supposed to get all objects within same coordinates 

class Realty < ActiveRecord::Base

  def self.group_by_coords

    joins(:address).group('addresses.coordinates::geometry').

    pluck(

      'array_agg(realties.id) as ids, addresses.coordinates::geometry'

    )

  end

end

accompanied with following test:

    describe 'group_by_coords' do

      it 'correctly group realties' do

        r1 = FactoryGirl.create(:apartment, address: FactoryGirl.create(:address, coordinates: 'POINT(106.0 10.0)'))

        r2 = FactoryGirl.create(:house, address: FactoryGirl.create(:address, coordinates: 'POINT(106.0 10.0)'))

        r3 = FactoryGirl.create(:apartment, address: FactoryGirl.create(:address, coordinates: 'POINT(106.5 10.5)'))

        byebug

        expect(Realty.group_by_coords).to eq(

          [[[r1.id, r2.id], r1.address.coordinates], [[r3.id], r3.address.coordinates]]

        )

      end

    end

  end

the problem is that points are restored as RGeo::Geos::CAPIPointImpl  instead of being RGeo::Geographic::SphericalPointImpl (the later seems to be an reachier object)

1) Realty scopes group_by_coords correctly group realties

     Failure/Error:

       expect(Realty.group_by_coords).to eq(

         [[[r1.id, r2.id], r1.address.coordinates], [[r3.id], r3.address.coordinates]]

       )

       expected: [[[956, 957], #<RGeo::Geographic::SphericalPointImpl:0x3fe1bc6ecd2c "POINT (106.0 10.0)">], [[958], #<RGeo::Geographic::SphericalPointImpl:0x3fe1b95f569c "POINT (106.5 10.5)">]]

            got: [[[956, 957], #<RGeo::Geos::CAPIPointImpl:0x3fe1bd8f3868 "POINT (106.0 10.0)">], [[958], #<RGeo::Geos::CAPIPointImpl:0x3fe1bd8f3444 "POINT (106.5 10.5)">]]

       (compared using ==)

I think I need to specify a proper factory to fix this, right?