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require 'spec_helper'
module Arel
module Predicates
describe Equality do
before do
@relation1 = Table.new(:users)
@relation2 = Table.new(:photos)
@attribute1 = @relation1[:id]
@attribute2 = @relation2[:user_id]
end
describe '#to_sql' do
describe 'when relating to a non-nil value' do
it "manufactures an equality predicate" do
sql = Equality.new(@attribute1, @attribute2).to_sql
adapter_is :mysql do
sql.should be_like(%Q{`users`.`id` = `photos`.`user_id`})
end
adapter_is_not :mysql do
sql.should be_like(%Q{"users"."id" = "photos"."user_id"})
end
end
end
describe 'when relation to a nil value' do
before do
@nil = nil
end
it "manufactures an is null predicate" do
sql = Equality.new(@attribute1, @nil).to_sql
adapter_is :mysql do
sql.should be_like(%Q{`users`.`id` IS NULL})
end
adapter_is_not :mysql do
sql.should be_like(%Q{"users"."id" IS NULL})
end
end
end
describe "when relating to a nil Value" do
it "manufactures an IS NULL predicate" do
value = nil.bind(@relation1)
sql = Equality.new(@attribute1, value).to_sql
adapter_is :mysql do
sql.should be_like(%Q{`users`.`id` IS NULL})
end
adapter_is_not :mysql do
sql.should be_like(%Q{"users"."id" IS NULL})
end
end
end
end
end
end
end
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