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require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
module ActiveRelation
describe Compound do
before do
class ConcreteCompound < Compound
def initialize(relation)
@relation = relation
end
end
@relation = Table.new(:users)
@compound_relation = ConcreteCompound.new(@relation)
end
describe '#attributes' do
it 'manufactures attributes associated with the compound relation' do
@compound_relation.attributes.should == @relation.attributes.collect { |a| Attribute.new(@compound_relation, a.name) }
end
end
describe '[]' do
describe 'when given a', Symbol do
it 'manufactures attributes associated with the compound relation if the symbol names an attribute within the relation' do
@compound_relation[:id].relation.should == @compound_relation
@compound_relation[:does_not_exist].should be_nil
end
end
describe 'when given an', Attribute do
it "manufactures a substituted attribute when given an attribute within the relation" do
@compound_relation[Attribute.new(@relation, :id)].should == Attribute.new(@compound_relation, :id)
@compound_relation[Attribute.new(@compound_relation, :id)].should == Attribute.new(@compound_relation, :id)
@compound_relation[Attribute.new(another_relation = Table.new(:photos), :id)].should be_nil
end
end
describe 'when given an', Expression do
before do
@nested_expression = Expression.new(Attribute.new(@relation, :id), "COUNT")
@unprojected_expression = Expression.new(Attribute.new(@relation, :id), "SUM")
@compound_relation = ConcreteCompound.new(Aggregation.new(@relation, :expressions => [@nested_expression]))
end
it "manufactures a substituted Expression when given an Expression within the relation" do
@compound_relation[@nested_expression].should == @nested_expression.substitute(@compound_relation)
@compound_relation[@compound_relation[@expression]].should == @compound_relation[@expression]
@compound_relation[@unprojected_expression].should be_nil
end
end
end
end
end
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