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Uncaught TypeError: imagecopymerge(): Argument #9 ($pct) must be of type int, string given in /.../lib/Varien/Image/Adapter/Gd2.php:570 Stack trace: #0 /.../lib/Varien/Image/Adapter/Gd2.php...

...a Ruby on Rails application “booksandreviews.com” exists with three models: class Book < ActiveRecord::Base belongs_to :author has_many :reviews end class Author < ActiveRecord::Base has_many :books end

...Review < ActiveRecord::Base belongs_to :book end 1. Nested Queries Active Record’s where method returns an instance of ActiveRecord::Relation. These relations can be passed to other methods to...