ActionView module declared several times

[John Merlino]

The ActionView module is declared several times in the Rails source:

rails/actionpack/lib/action_view/base.rb,rails/actionpack/lib/
action_view/buffers.rb,rails/actionpack/lib/action_view/digestor.rb,
rails/actionpack/lib/action_view/helpers/asset_tag_helpers/
asset_paths.rb, and the list goes on and on.

How is it able to be declared like this in multiple files without the
previous definition of it being overwritten?

[Colin Law]

It is a basic feature of Ruby that you can re-open a class definition
and add or redefine methods.

Colin

[Иван Бишевац]

2012/9/3 John Merlino <stoi...@aol.com>

--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To post to this group, send email to rubyonra...@googlegroups.com.
To unsubscribe from this group, send email to rubyonrails-ta...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

It's kind of "metaprogramming—creating code at runtime that defines new methods. In fact, in a sense all Ruby programming is metaprogramming, since even a class definition is not a declaration as it is in Java but actually code that is executed at runtime. Given that this is true, you might wonder whether you can modify a class at runtime. In fact you can, by adding or changing instance methods or class methods, even for Ruby’s built-in classes".

This is citation from book Engineering Long-Lasting Software: An Agile Approach Using SaaS and Cloud Computing

[John Merlino]

Yes, it is a basic feature of ruby that you can reopen a class
definition. I forgot about that.

On Sep 3, 4:05 pm, Colin Law <clan...@googlemail.com> wrote:

[uma mahesh varma Seeram]

The metaprogramming nature of ruby is the most advantage feature of ruby. 

Thank You,

Uma Mahesh.