#152 Rails 2.3 Extras

Mar 09, 2009 | 9 minutes | Rails 2.3, Active Record, Active Support

This episode finishes up this series on Rails 2.3. Here you will learn about several smaller additions in 2.3.

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Resources

          bash
                
        gem install rails --source http://gems.rubyonrails.org
        
gem install rails --source http://gems.rubyonrails.org

          ruby
                
        # find in batches
Product.count
Product.find_in_batches(:batch_size => 10) do |batch|
  puts "Products in batch: #{batch.size}"
end
Product.each(:batch_size => 10) do |product|
  puts product.name
end

# scoped_by
Product.scoped_by_price(4.99).size
Product.scoped_by_price(4.99).first
Product.scoped_by_price(4.99).scoped_by_category_id(3).first

# try method
Product.find_by_price(4.99).name
Product.find_by_price(4.95).name
Product.find_by_price(4.95).try(:name)
Product.find_by_price(4.99).try(:name)
        
        
        
        
        
        
        
        
        
      
# find in batches
Product.count
Product.find_in_batches(:batch_size => 10) do |batch|
  puts "Products in batch: #{batch.size}"
end
Product.each(:batch_size => 10) do |product|
  puts product.name
end

# scoped_by
Product.scoped_by_price(4.99).size
Product.scoped_by_price(4.99).first
Product.scoped_by_price(4.99).scoped_by_category_id(3).first

# try method
Product.find_by_price(4.99).name
Product.find_by_price(4.95).name
Product.find_by_price(4.95).try(:name)
Product.find_by_price(4.99).try(:name)

          product.rb
                
        default_scope :order => "name"
        
default_scope :order => "name"

          categories_controller.rb
                
        render 'new'
render 'products/edit'
        
render 'new'
render 'products/edit'

          products/index.html.erb
                
        <%= render @products %>
        
<%= render @products %>

          products/show.html.erb
                
        <%= render @product %>
        
<%= render @product %>