kaminari--kaminari/spec/models/active_record/scopes_spec.rb

require 'spec_helper'

shared_examples_for 'the first page' do
  it { should have(25).users }
  its('first.name') { should == 'user001' }
end

shared_examples_for 'blank page' do
  it { should have(0).users }
end

describe Kaminari::ActiveRecordExtension do
  before do
    1.upto(100) {|i| User.create! :name => "user#{'%03d' % i}", :age => (i / 10)}
    1.upto(100) {|i| GemDefinedModel.create! :name => "user#{'%03d' % i}", :age => (i / 10)}
  end

  [User, Admin, GemDefinedModel].each do |model_class|
    context "for #{model_class}" do
      describe '#page' do
        context 'page 1' do
          subject { model_class.page 1 }
          it_should_behave_like 'the first page'
        end

        context 'page 2' do
          subject { model_class.page 2 }
          it { should have(25).users }
          its('first.name') { should == 'user026' }
        end

        context 'page without an argument' do
          subject { model_class.page }
          it_should_behave_like 'the first page'
        end

        context 'page < 1' do
          subject { model_class.page 0 }
          it_should_behave_like 'the first page'
        end

        context 'page > max page' do
          subject { model_class.page 5 }
          it_should_behave_like 'blank page'
        end

        describe 'ensure #order_values is preserved' do
          subject { model_class.order('id').page 1 }
          its('order_values.uniq') { should == ['id'] }
        end
      end

      describe '#per' do
        context 'page 1 per 5' do
          subject { model_class.page(1).per(5) }
          it { should have(5).users }
          its('first.name') { should == 'user001' }
        end
      end

      describe '#padding' do
        context 'page 1 per 5 padding 1' do
          subject { model_class.page(1).per(5).padding(1) }
          it { should have(5).users }
          its('first.name') { should == 'user002' }
        end
      end

      describe '#num_pages' do
        context 'per 25 (default)' do
          subject { model_class.page }
          its(:num_pages) { should == 4 }
        end

        context 'per 7' do
          subject { model_class.page(2).per(7) }
          its(:num_pages) { should == 15 }
        end

        context 'per 65536' do
          subject { model_class.page(50).per(65536) }
          its(:num_pages) { should == 1 }
        end

        context 'per 0 (using default)' do
          subject { model_class.page(50).per(0) }
          its(:num_pages) { should == 4 }
        end

        context 'per -1 (using default)' do
          subject { model_class.page(5).per(-1) }
          its(:num_pages) { should == 4 }
        end

        context 'per "String value that can not be converted into Number" (using default)' do
          subject { model_class.page(5).per('aho') }
          its(:num_pages) { should == 4 }
        end
      end


      describe '#current_page' do
        context 'page 1' do
          subject { model_class.page }
          its(:current_page) { should == 1 }
        end

        context 'page 2' do
          subject { model_class.page(2).per 3 }
          its(:current_page) { should == 2 }
        end
      end

      describe '#first_page?' do
        context 'on first page' do
          subject { model_class.page(1).per(10) }
          its(:first_page?) { should == true }
        end

        context 'not on first page' do
          subject { model_class.page(5).per(10) }
          its(:first_page?) { should == false }
        end
      end

      describe '#last_page?' do
        context 'on last page' do
          subject { model_class.page(10).per(10) }
          its(:last_page?) { should == true }
        end

        context 'not on last page' do
          subject { model_class.page(1).per(10) }
          its(:last_page?) { should == false }
        end
      end

      describe '#count' do
        context 'page 1' do
          subject { model_class.page }
          its(:count) { should == 25 }
        end

        context 'page 2' do
          subject { model_class.page 2 }
          its(:count) { should == 25 }
        end
      end

      context 'chained with .group' do
        subject { model_class.group('age').page(2).per 5 }
        # 0..10
        its(:total_count) { should == 11 }
        its(:num_pages) { should == 3 }
      end

      context 'activerecord descendants' do
        subject { ActiveRecord::Base.descendants }
        its(:length) { should_not == 0 }
      end
    end
  end
end