rom-sql/spec/unit/plugin/pagination_spec.rb at bad3047d94bfcec0043bdfe401e919d3d812a8f8 · rom-rb/rom-sql · GitHub

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require 'rom/sql/plugin/pagination'

RSpec.describe 'Plugin / Pagination', seeds: false do
  include_context 'users'

  with_adapters do
    before do
      9.times { |i| conn[:users].insert(name: "User #{i}") }

      conf.relation(:users) do
        use :pagination

        per_page 4
      end
    end

    describe '#page' do
      it 'allow to call with stringify number' do
        expect {
          container.relations[:users].page('5')
        }.to_not raise_error
      end

      it 'preserves existing modifiers' do
        expect(
          container.relations[:users].send(:where, name: 'User 2').page(1).to_a.size
        ).to be(1)
      end
    end

    describe '#per_page' do
      it 'allow to call with stringify number' do
        expect {
          container.relations[:users].per_page('5')
        }.to_not raise_error
      end

      it 'returns paginated relation with provided limit' do
        users = container.relations[:users].page(2).per_page(5)

        expect(users.dataset.opts[:offset]).to eql(5)
        expect(users.dataset.opts[:limit]).to eql(5)

        expect(users.pager.current_page).to eql(2)

        expect(users.pager.total).to be(9)
        expect(users.pager.total_pages).to be(2)

        expect(users.pager.next_page).to be(nil)
        expect(users.pager.prev_page).to be(1)
        expect(users.pager.limit_value).to eql(5)
      end
    end

    describe '#total_pages' do
      it 'returns a single page when elements are a perfect fit' do
        users = container.relations[:users].page(1).per_page(3)
        expect(users.pager.total_pages).to eql(3)
      end

      it 'returns the exact number of pages to accommodate all elements' do
        users = container.relations[:users].per_page(9)
        expect(users.pager.total_pages).to eql(1)
      end

      it 'returns one page when relation is filtered' do
        users = container.relations[:users].per_page(1).where(name: "User 1")
        expect(users.pager.total_pages).to eql(1)

        users = container.relations[:users].where(name: "User 1").per_page(1)
        expect(users.pager.total_pages).to eql(1)
      end
    end

    describe "#next_page" do
      it "returns nil when there is no next page in filtered relation" do
        users = container.relations[:users].per_page(1).where(name: "User 1")
        expect(users.pager.next_page).to be(nil)

        users = container.relations[:users].where(name: "User 1").per_page(1)
        expect(users.pager.next_page).to be(nil)
      end
    end

    describe '#pager' do
      it 'returns a pager with pagination meta-info' do
        users = container.relations[:users].page(1)

        expect(users.pager.total).to be(9)
        expect(users.pager.total_pages).to be(3)

        expect(users.pager.current_page).to be(1)
        expect(users.pager.next_page).to be(2)
        expect(users.pager.prev_page).to be(nil)
        expect(users.pager.first_in_page).to eq(1)
        expect(users.pager.last_in_page).to eq(4)

        users = container.relations[:users].page(2)

        expect(users.pager.current_page).to be(2)
        expect(users.pager.next_page).to be(3)
        expect(users.pager.prev_page).to be(1)
        expect(users.pager.first_in_page).to eq(5)
        expect(users.pager.last_in_page).to eq(8)

        users = container.relations[:users].page(3)

        expect(users.pager.next_page).to be(nil)
        expect(users.pager.prev_page).to be(2)
        expect(users.pager.first_in_page).to eq(9)
        expect(users.pager.last_in_page).to eq(9)
      end
    end
  end
end