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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)
@attribute1 = Attribute.new(@relation1, :id)
@attribute2 = Attribute.new(@relation1, :name)
end
describe Relation, 'joins' do
describe Relation, '<=>' do
it "manufactures an inner join operation between those two relations" do
(@relation1 <=> @relation2).should == InnerJoinOperation.new(@relation1, @relation2)
end
end
describe Relation, '<<' do
it "manufactures a left outer join operation between those two relations" do
(@relation1 << @relation2).should == LeftOuterJoinOperation.new(@relation1, @relation2)
end
end
end
describe Relation, '[]' do
it "manufactures an attribute when given a symbol" do
@relation1[:id].should be_eql(Attribute.new(@relation1, :id))
end
it "manufactures a range relation when given a range" do
@relation1[1..2].should == RangeRelation.new(@relation1, 1..2)
end
end
describe Relation, '#include?' do
it "manufactures an inclusion predicate" do
@relation1.include?(@attribute1).should == RelationInclusionPredicate.new(@attribute1, @relation1)
end
end
describe Relation, '#project' do
it "collapses identical projections" do
pending
end
it "manufactures a projection relation" do
@relation1.project(@attribute1, @attribute2).should == ProjectionRelation.new(@relation1, @attribute1, @attribute2)
end
end
describe Relation, '#select' do
before do
@predicate = EqualityPredicate.new(@attribute1, @attribute2)
end
it "manufactures a selection relation" do
@relation1.select(@attribute1, @attribute2).should == SelectionRelation.new(@relation1, @attribute1, @attribute2)
end
end
describe Relation, 'order' do
it "manufactures an order relation" do
@relation1.order(@attribute1, @attribute2).should == OrderRelation.new(@relation1, @attribute1, @attribute2)
end
end
end
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