add method to iterate on blocks of any size and works with each row

lib/rasti/db/query.rb

@@ -74,6 +74,14 @@ def each(&block)
         all.each(&block)
       end
 
+      def each_page(size:, &block)
+        dataset.each_page(size) do |page|
+          page.each do |row|
+            block.call collection_class.model.new(with_graph(row))
+          end
+        end
+      end
+
       def graph(*relations)
         build_query relations_graph: relations_graph.merge(relations: relations)
       end

spec/minitest_helper.rb

@@ -132,6 +132,8 @@ class Minitest::Spec
   let :db do
     Sequel.connect(driver).tap do |db|
 
+      db.extension :pagination
+
       db.create_table :users do
         primary_key :id
         String :name, null: false, unique: true

spec/query_spec.rb

@@ -174,6 +174,17 @@
     users_query.detect(id: 3).must_equal User.new(id: 3, name: 'User 3')
   end
 
+  it 'Each page' do
+    user_pages = []
+    users_query.each_page(size: 2) do | page |
+      user_pages << page
+    end
+    user_pages.size.must_equal 10
+    user_pages.each_with_index do | user_page, i |
+      user_page.must_equal User.new(id: i+1, name: "User #{i+1}")
+    end
+  end
+
   it 'Where' do
     users_query.where(id: 3).all.must_equal [User.new(id: 3, name: 'User 3')]
   end