Croplio questions

• How to judge whether a Constant has been defined within a module namespace, not a global one?
• How can I know whether a class is inherited from another one? Some methods like is_a?
• How to config mercurial to push without asking my password through ssh?
• In rubyonrails, how to get the associated model class from and ActiveRecord::Relation object?
• How to judge whether a method has defined in a class?
• How to pass parameters to a proc when calling it by a method?
• In rails, how to destroy a 'join table item' with out deleting the real record?
• How to get the raw 'created_at' value in the database (not an object cast to an ActiveSupport::TimeWithZone)
• How to dynamically define a class method which will refer to a local variable outside?
• How to parse a yaml file into ruby hashs and/or arrays?

Croplio answers