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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Expression do
before do
@relation = Table.new(:users)
@attribute = @relation[:id]
end
describe Expression::Transformations do
before do
@expression = Expression.new(@attribute, "COUNT")
end
describe '#bind' do
it "manufactures an attribute with a rebound relation and self as the ancestor" do
derived_relation = @relation.select(@relation[:id].eq(1))
@expression.bind(derived_relation).should == Expression.new(@attribute.bind(derived_relation), "COUNT", nil, @expression)
end
it "returns self if the substituting to the same relation" do
@expression.bind(@relation).should == @expression
end
end
describe '#as' do
it "manufactures an aliased expression" do
@expression.as(:alias).should == Expression.new(@attribute, "COUNT", :alias, @expression)
end
end
describe '#to_attribute' do
it "manufactures an attribute with the expression as an ancestor" do
@expression.to_attribute.should == Attribute.new(@expression.relation, @expression.alias, :ancestor => @expression)
end
end
end
describe '#to_sql' do
it "manufactures sql with the expression and alias" do
Expression.new(@attribute, "COUNT", :alias).to_sql.should == "COUNT(`users`.`id`) AS `alias`"
end
end
end
end
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