spec/models/concerns/each_batch_spec.rb


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require 'spec_helper'

describe EachBatch do
  describe '.each_batch' do
    let(:model) do
      Class.new(ActiveRecord::Base) do
        include EachBatch

        self.table_name = 'users'
      end
    end

    before do
      5.times { create(:user, updated_at: 1.day.ago) }
    end

    shared_examples 'each_batch handling' do |kwargs|
      it 'yields an ActiveRecord::Relation when a block is given' do
        model.each_batch(kwargs) do |relation|
          expect(relation).to be_a_kind_of(ActiveRecord::Relation)
        end
      end

      it 'yields a batch index as the second argument' do
        model.each_batch(kwargs) do |_, index|
          expect(index).to eq(1)
        end
      end

      it 'accepts a custom batch size' do
        amount = 0

        model.each_batch(kwargs.merge({ of: 1 })) { amount += 1 }

        expect(amount).to eq(5)
      end

      it 'does not include ORDER BYs in the yielded relations' do
        model.each_batch do |relation|
          expect(relation.to_sql).not_to include('ORDER BY')
        end
      end

      it 'allows updating of the yielded relations' do
        time = Time.now

        model.each_batch do |relation|
          relation.update_all(updated_at: time)
        end

        expect(model.where(updated_at: time).count).to eq(5)
      end
    end

    it_behaves_like 'each_batch handling', {}
    it_behaves_like 'each_batch handling', { order_hint: :updated_at }
  end
end