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require File.join(File.dirname(__FILE__), '..', 'spec_helper')
describe JoinRelation do
before do
@relation1 = TableRelation.new(:foo)
@relation2 = TableRelation.new(:bar)
@predicate = EqualityPredicate.new(@relation1[:id], @relation2[:id])
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 '#qualify' do
it 'distributes over the relations and predicates' do
JoinRelation.new(@relation1, @relation2, @predicate).qualify. \
should == JoinRelation.new(@relation1.qualify, @relation2.qualify, @predicate.qualify)
end
end
describe '#to_sql' do
before do
@relation1 = @relation1.select(@relation1[:id] == @relation2[:foo_id])
class ConcreteJoinRelation < JoinRelation
def join_type
: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_s.should == SelectBuilder.new do
select do
column :foo, :name
column :foo, :id
column :bar, :name
column :bar, :foo_id
column :bar, :id
end
from :foo do
inner_join :bar do
equals do
column :foo, :id
column :bar, :id
end
end
end
where do
equals do
column :foo, :id
column :bar, :foo_id
end
end
end.to_s
end
end
end
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