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require '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" do
check @relation[:id].should == @attribute1
check @relation['id'].should == @attribute1
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
join = @relation.join(@relation).on(@predicate)
join.relation1.should == @relation
join.relation2.should == @relation
join.predicates.should == [@predicate]
join.should be_kind_of(InnerJoin)
end
end
describe "when given a string" do
it "manufactures a join operation with the string passed through" do
arbitrary_string = "ASDF"
join = @relation.join(arbitrary_string)
join.relation1.should == @relation
join.relation2.should == arbitrary_string
join.predicates.should == []
join.should be_kind_of StringJoin
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
join = @relation.outer_join(@relation).on(@predicate)
join.relation1.should == @relation
join.relation2.should == @relation
join.predicates.should == [@predicate]
join.should be_kind_of OuterJoin
end
end
end
describe '#project' do
it "manufactures a projection relation" do
project = @relation.project(@attribute1, @attribute2)
project.relation.should == @relation
project.projections.should == [@attribute1, @attribute2]
project.should be_kind_of Project
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 '#where' do
before do
@predicate = Predicates::Equality.new(@attribute1, @attribute2)
end
it "manufactures a where relation" do
where = @relation.where(@predicate)
where.relation.should == @relation
where.predicates.should == [@predicate]
where.should be_kind_of Where
end
it "accepts arbitrary strings" do
where = @relation.where("arbitrary")
where.relation.should == @relation
where.predicates.length.should == 1
where.predicates.first.value.should == "arbitrary"
where.should be_kind_of Where
end
describe 'when given a blank predicate' do
it 'returns self' do
@relation.where.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
take = @relation.take(5)
take.relation.should == @relation
take.taken.should == 5
end
describe 'when given a blank number of items' do
it 'raises error' do
lambda { @relation.take }.should raise_exception
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 == Group.new(@relation, [@attribute1, @attribute2])
end
describe 'when given blank groupings' do
it 'returns self' do
@relation.group.should == @relation
end
end
end
describe 'relation is writable' do
describe '#delete' do
it 'manufactures a deletion relation' do
Session.start do |s|
s.should_receive(:delete).with(Deletion.new(@relation))
@relation.delete
end
end
end
describe '#insert' do
it 'manufactures an insertion relation' do
Session.start do |s|
record = { @relation[:name] => 'carl' }
s.should_receive(:create).with(Insert.new(@relation, record))
@relation.insert(record)
end
end
end
describe '#update' do
it 'manufactures an update relation' do
Session.start do |s|
assignments = { @relation[:name] => Value.new('bob', @relation) }
s.should_receive(:update).with(Update.new(@relation, assignments))
@relation.update(assignments)
end
end
end
end
end
describe 'is enumerable' do
it "implements enumerable" do
@relation.map { |value| value }.should ==
@relation.session.read(@relation).map { |value| value }
end
end
end
end
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