require 'spec_helper'

module Arel
  describe Join do
    before do
      @users = Array.new([
        [1, 'bryan' ],
        [2, 'emilio' ],
        [3, 'nick']
      ], [[:id, Attributes::Integer], [:name, Attributes::String]])
      @photos = Table.new(:photos)
      @photos.delete
      @photos.insert(@photos[:id] => 1, @photos[:user_id] => 1, @photos[:camera_id] => 6)
      @photos.insert(@photos[:id] => 2, @photos[:user_id] => 2, @photos[:camera_id] => 42)
      # Oracle adapter returns database integers as Ruby integers and not strings
      # So does the FFI sqlite library
      db_int_return = @photos.project(@photos[:camera_id]).first.tuple.first
      @adapter_returns_integer = db_int_return.is_a?(String) ? false : true
    end

    describe 'when the in memory relation is on the left' do
      it 'joins across engines' do
        @users                                         \
          .join(@photos)                               \
            .on(@users[:id].eq(@photos[:user_id]))     \
          .project(@users[:name], @photos[:camera_id]) \
        .tap do |relation|
          rows = relation.call
          rows.length.should == 2
          [
            ['bryan', @adapter_returns_integer ? 6 : '6'],
            ['emilio', @adapter_returns_integer ? 42 : '42']
          ].zip(rows).each do |tuple, row|
            row.relation.should == relation
            row.tuple.should == tuple
          end
        end
      end
    end

    describe 'when the in memory relation is on the right' do
      it 'joins across engines' do
        @photos                                        \
          .join(@users)                                \
            .on(@users[:id].eq(@photos[:user_id]))     \
          .project(@users[:name], @photos[:camera_id]) \
        .tap do |relation|
          rows = relation.call
          rows.length.should == 2
          [
            ['bryan', @adapter_returns_integer ? 6 : '6'],
            ['emilio', @adapter_returns_integer ? 42 : '42']
          ].zip(rows).each do |tuple, row|
            row.relation.should == relation
            row.tuple.should == tuple
          end
        end
      end
    end
  end
end