Rails - Jan 2008 - (Non-active Record) Models and inheritance

I have a non-persisted model for a web form. Model is taking care of
business logic without mapping directly to a DB.

I have included validation for the form model by creating the following
Module :

module Validation::ModelValidation
   [:save, :save!, :update_attribute].each{ |attr| define_method(attr){}
}

   def method_missing(symbol, *params)
     if(symbol.to_s =~ /(.*)_before_type_cast$/)
      send($1)
     end
   end


   def self.append_features(base)
     super
     base.send(:include, ActiveRecord::Validations)
   end


end

and including in my model with:


class MyValidatedModel
  include Validation::ModelValidation

  ...
end

In ''MyValidatedModel'' I also have needed to add the method

  def self.human_attribute_name(attr)
    return @@atty_names[attr] || (attr.nil??attr:attr.humanize)
  end

for the framework to return friendly names to
''error_messages_for'', and
have my field names and corresponding names in a class hash as per :

  @@atty_names = {
    ''username'' => ''User Name'',
    ''email'' =>    ''E-Mail Address'',
    ''firstname'' =>''First Name'',
    ''lastname'' => ''Last Name'',
    ''dob'' =>      ''Date of Birth'',
  }

I wanted self.human_attribute_name(attr) to be in the module also, but
it wouldn''t work there, so I am looking at model inheritance for models
to achieve this.

I have other forms that I also want to use validation with.

I am thinking of creating a ValidatableModel class, with the
human_attribute_name(attr) method and associated hash in it and
including the module, and then inherit from this in all the
Non-active-record models I want to be validatable.

I am just wondering if there is a better way to solve this, and what are
the conventions for model inheritance for non-persisted models in rails.

So far I have only found discussions relating to ActiveRecord persisted
models online.

Still looking...
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Small point on error,

replace
>   def self.human_attribute_name(attr)
>     return @@atty_names[attr] || (attr.nil??attr:attr.humanize)
>   end
with

  def self.human_attribute_name(attr)
    return @@atty_names[attr] || attr.humanize
  end

if you are duplicating this as the ternary operation was unneccessary

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On 23 Jan 2008, at 13:15, Dara Ca wrote:
>
> In ''MyValidatedModel'' I also have needed to add the
method
>
>  def self.human_attribute_name(attr)
>    return @@atty_names[attr] || (attr.nil??attr:attr.humanize)
>  end
>
> for the framework to return friendly names to
''error_messages_for'',
> and
> have my field names and corresponding names in a class hash as per :
>
>  @@atty_names = {
>    ''username'' => ''User Name'',
>    ''email'' =>    ''E-Mail Address'',
>    ''firstname'' =>''First Name'',
>    ''lastname'' => ''Last Name'',
>    ''dob'' =>      ''Date of Birth'',
>  }
>
> I wanted self.human_attribute_name(attr) to be in the module also, but
> it wouldn''t work there, so I am looking at model inheritance for  
> models
> to achieve this.
The classic way of doing this is to have a ClassMethods module  
containing the class methods you want to add.
You can then to base.extend(ClassMethods) from self.included (or since  
from append_features since you''re use that)

Fred
>
>
> I have other forms that I also want to use validation with.
>
> I am thinking of creating a ValidatableModel class, with the
> human_attribute_name(attr) method and associated hash in it and
> including the module, and then inherit from this in all the
> Non-active-record models I want to be validatable.
>
> I am just wondering if there is a better way to solve this, and what  
> are
> the conventions for model inheritance for non-persisted models in  
> rails.
>
> So far I have only found discussions relating to ActiveRecord  
> persisted
> models online.
>
> Still looking...
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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