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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Relation do
before do
@relation = Table.new(:users)
@attribute1 = @relation[:id]
@attribute2 = @relation[:name]
end
describe '[]' do
describe 'when given an', Attribute do
it "return the attribute congruent to the provided attribute" do
@relation[@attribute1].should == @attribute1
end
end
describe 'when given a', Symbol, String do
it "returns the attribute with the same name, if it exists" do
@relation[:id].should == @attribute1
@relation['id'].should == @attribute1
@relation[:does_not_exist].should be_nil
end
end
end
describe Relation::Operable do
describe 'joins' do
before do
@predicate = @relation[:id].eq(@relation[:id])
end
describe '#join' do
describe 'when given a relation' do
it "manufactures an inner join operation between those two relations" do
@relation.join(@relation).on(@predicate). \
should == Join.new("INNER JOIN", @relation, @relation, @predicate)
end
end
describe "when given a string" do
it "manufactures a join operation with the string passed through" do
@relation.join(arbitrary_string = "ASDF").should == Join.new(arbitrary_string, @relation)
end
end
describe "when given something blank" do
it "returns self" do
@relation.join.should == @relation
end
end
end
describe '#outer_join' do
it "manufactures a left outer join operation between those two relations" do
@relation.outer_join(@relation).on(@predicate). \
should == Join.new("LEFT OUTER JOIN", @relation, @relation, @predicate)
end
end
end
describe '#project' do
it "manufactures a projection relation" do
@relation.project(@attribute1, @attribute2). \
should == Projection.new(@relation, @attribute1, @attribute2)
end
describe "when given blank attributes" do
it "returns self" do
@relation.project.should == @relation
end
end
end
describe '#alias' do
it "manufactures an alias relation" do
@relation.alias.relation.should == Alias.new(@relation).relation
end
end
describe '#select' do
before do
@predicate = Equality.new(@attribute1, @attribute2)
end
it "manufactures a selection relation" do
@relation.select(@predicate).should == Selection.new(@relation, @predicate)
end
it "accepts arbitrary strings" do
@relation.select("arbitrary").should == Selection.new(@relation, "arbitrary")
end
describe 'when given a blank predicate' do
it 'returns self' do
@relation.select.should == @relation
end
end
end
describe '#order' do
it "manufactures an order relation" do
@relation.order(@attribute1, @attribute2).should == Order.new(@relation, @attribute1, @attribute2)
end
describe 'when given a blank ordering' do
it 'returns self' do
@relation.order.should == @relation
end
end
end
describe '#take' do
it "manufactures a take relation" do
@relation.take(5).should == Take.new(@relation, 5)
end
describe 'when given a blank number of items' do
it 'returns self' do
@relation.take.should == @relation
end
end
end
describe '#skip' do
it "manufactures a skip relation" do
@relation.skip(4).should == Skip.new(@relation, 4)
end
describe 'when given a blank number of items' do
it 'returns self' do
@relation.skip.should == @relation
end
end
end
describe '#group' do
it 'manufactures a group relation' do
@relation.group(@attribute1, @attribute2).should == Grouping.new(@relation, @attribute1, @attribute2)
end
describe 'when given blank groupings' do
it 'returns self' do
@relation.group.should == @relation
end
end
end
describe Relation::Operable::Writable do
describe '#delete' do
it 'manufactures a deletion relation' do
Session.start do
mock(Session.new).delete(Deletion.new(@relation))
@relation.delete.should == @relation
end
end
end
describe '#insert' do
it 'manufactures an insertion relation' do
Session.start do
record = {@relation[:name] => 'carl'}
mock(Session.new).create(Insertion.new(@relation, record))
@relation.insert(record).should == @relation
end
end
end
describe '#update' do
it 'manufactures an update relation' do
Session.start do
assignments = {@relation[:name] => Value.new('bob', @relation)}
mock(Session.new).update(Update.new(@relation, assignments))
@relation.update(assignments).should == @relation
end
end
end
end
end
describe Relation::Enumerable do
it "implements enumerable" do
@relation.collect.should == @relation.session.read(@relation)
@relation.first.should == @relation.session.read(@relation).first
end
end
describe '#call' do
it 'executes a select_all on the connection' do
mock(connection = Object.new).execute(@relation.to_sql) { [] }
@relation.call(connection)
end
end
end
end
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