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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Table do
before do
@relation = Table.new(:users)
end
describe '[]' do
describe 'when given a', Symbol do
it "manufactures an attribute if the symbol names an attribute within the relation" do
@relation[:id].should == Attribute.new(@relation, :id)
@relation[:does_not_exist].should be_nil
end
end
describe 'when given an', Attribute do
it "returns the attribute if the attribute is within the relation" do
@relation[@relation[:id]].should == @relation[:id]
end
it "returns nil if the attribtue is not within the relation" do
another_relation = Table.new(:photos)
@relation[another_relation[:id]].should be_nil
end
end
describe 'when given an', Expression do
before do
@expression = @relation[:id].count
end
it "returns the Expression if the Expression is within the relation" do
@relation[@expression].should be_nil
end
end
end
describe '#to_sql' do
it "manufactures a simple select query" do
@relation.to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`
FROM `users`
")
end
end
describe '#column_for' do
it "returns the column corresponding to the attribute" do
@relation.column_for(@relation[:id]).should == @relation.columns.detect { |c| c.name == 'id' }
end
end
describe '#prefix_for' do
it "returns the table name if the relation contains the attribute" do
@relation.prefix_for(@relation[:id]).should == 'users'
@relation.prefix_for(:does_not_exist).should be_nil
end
end
describe '#attributes' do
it 'manufactures attributes corresponding to columns in the table' do
@relation.attributes.should == [
Attribute.new(@relation, :id),
Attribute.new(@relation, :name)
]
end
describe '#reset' do
it "reloads columns from the database" do
lambda { stub(@relation.engine).columns { [] } }.should_not change { @relation.attributes }
lambda { @relation.reset }.should change { @relation.attributes }
end
end
end
describe 'hashing' do
it "implements hash equality" do
Table.new(:users).should hash_the_same_as(Table.new(:users))
Table.new(:users).should_not hash_the_same_as(Table.new(:photos))
end
end
describe '#engine' do
it "defaults to global engine" do
Table.engine = engine = Engine.new
Table.new(:users).engine.should == engine
end
it "can be specified" do
Table.new(:users, engine = Engine.new).engine.should == engine
end
end
end
end
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