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require File.join(File.dirname(__FILE__), '..', 'spec_helper')
describe Relation do
before do
@relation1 = TableRelation.new(:foo)
@relation2 = TableRelation.new(:bar)
end
describe Relation, '*' do
it "manufactures a JoinOperation between those two relations" do
(@relation1 * @relation2).should == JoinOperation.new(@relation1, @relation2)
end
end
describe Relation, '[]' do
it "manufactures a attribute" do
@relation1[:id].should be_eql(Attribute.new(@relation1, :id))
end
it "raises an error if the named attribute is not part of the relation" do
pending
end
end
describe Relation, '#include?' do
before do
@attribute = Attribute.new(@relation1, :id)
end
it "manufactures an inclusion predicate" do
@relation1.include?(@attribute).should == RelationInclusionPredicate.new(@attribute, @relation1)
end
end
describe Relation, '#project' do
before do
@attribute1 = Attribute.new(@relation1, :id)
@attribute2 = Attribute.new(@relation1, :name)
end
it "only allows projecting attributes in the relation" do
pending
end
it "collapses identical projections" do
pending
end
it "manufactures a projected relation" do
@relation1.project(@attribute1, @attribute2).should == ProjectedRelation(@relation1, @attribute1, @attribute2)
end
end
describe Relation, '#select' do
before do
@predicate = EqualityPredicate.new()
end
it "manufactures a selected relation" do
@relation1.select(@attribute1, @attribute2).should == SelectedRelation(@relation1, @attribute1, @attribute2)
end
end
end
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