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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module ActiveRelation
describe Projection do
before do
@relation = Table.new(:users)
@attribute = @relation[:id]
end
describe '#attributes' do
before do
@projection = Projection.new(@relation, @attribute)
end
it "manufactures attributes associated with the projection relation" do
@projection.attributes.should == [@attribute].collect { |a| a.bind(@projection) }
end
end
describe '==' do
before do
@another_relation = Table.new(:photos)
@another_attribute = @relation[:name]
end
it "obtains if the relations and attributes are identical" do
Projection.new(@relation, @attribute).should == Projection.new(@relation, @attribute)
Projection.new(@relation, @attribute).should_not == Projection.new(@another_relation, @attribute)
Projection.new(@relation, @attribute).should_not == Projection.new(@relation, @another_attribute)
end
end
describe '#to_sql' do
describe 'when given an attribute' do
it "manufactures sql with a limited select clause" do
Projection.new(@relation, @attribute).to_sql.should be_like("
SELECT `users`.`id`
FROM `users`
")
end
end
describe 'when given a relation' do
before do
@scalar_relation = Projection.new(@relation, @relation[:name])
end
it "manufactures sql with scalar selects" do
Projection.new(@relation, @scalar_relation).to_sql.should be_like("
SELECT (SELECT `users`.`name` FROM `users`) FROM `users`
")
end
end
describe 'when given a string' do
it "passes the string through to the select clause" do
Projection.new(@relation, 'asdf').to_sql.should be_like("
SELECT asdf FROM `users`
")
end
end
end
describe Projection::Externalizable do
describe '#aggregation?' do
describe 'when the projections are attributes' do
it 'returns false' do
Projection.new(@relation, @attribute).should_not be_aggregation
end
end
describe 'when the projections include an aggregation' do
it "obtains" do
Projection.new(@relation, @attribute.sum).should be_aggregation
end
end
end
end
end
end
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