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require File.join(File.dirname(__FILE__), '..', 'spec_helper')
describe 'between two relations' do
before do
@relation1 = TableRelation.new(:foo)
@relation2 = TableRelation.new(:bar)
@predicate = EqualityPredicate.new(@relation1[:a], @relation2[:b])
end
describe '==' do
it 'obtains if the two relations and the predicate are identical' do
JoinRelation.new(@relation1, @relation2, @predicate).should == JoinRelation.new(@relation1, @relation2, @predicate)
JoinRelation.new(@relation1, @relation2, @predicate).should_not == JoinRelation.new(@relation1, @relation1, @predicate)
end
it 'is commutative on the relations' do
JoinRelation.new(@relation1, @relation2, @predicate).should == JoinRelation.new(@relation2, @relation1, @predicate)
end
end
describe '#to_sql' do
before do
@relation1 = @relation1.select(@relation1[:c] == @relation2[:d])
class ConcreteJoinRelation < JoinRelation
def join_name
:inner_join
end
end
end
it 'manufactures sql joining the two tables on the predicate, merging the selects' do
ConcreteJoinRelation.new(@relation1, @relation2, @predicate).to_sql.to_s.should == SelectBuilder.new do
select { all }
from :foo do
inner_join :bar do
equals do
column :foo, :a
column :bar, :b
end
end
end
where do
equals do
column :foo, :c
column :bar, :d
end
end
end.to_s
end
end
end
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