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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module ActiveRelation
describe Equality do
before do
@relation1 = Table.new(:users)
@relation2 = Table.new(:photos)
@attribute1 = @relation1[:id]
@attribute2 = @relation2[:user_id]
end
describe '==' do
it "obtains if attribute1 and attribute2 are identical" do
Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute1, @attribute2)
Equality.new(@attribute1, @attribute2).should_not == Equality.new(@attribute1, @attribute1)
end
it "obtains if the concrete type of the predicates are identical" do
Equality.new(@attribute1, @attribute2).should_not == Binary.new(@attribute1, @attribute2)
end
it "is commutative on the attributes" do
Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute2, @attribute1)
end
end
describe '#to_sql' do
describe 'when relating to a non-nil value' do
it "manufactures an equality predicate" do
Equality.new(@attribute1, @attribute2).to_sql.should be_like("
`users`.`id` = `photos`.`user_id`
")
end
end
describe 'when relation to a nil value' do
before do
@nil = nil
end
it "manufactures an is null predicate" do
Equality.new(@attribute1, @nil).to_sql.should be_like("
`users`.`id` IS NULL
")
end
end
end
end
end
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