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Max Williams

2007-Sep-20 13:03 UTC

Helper method for models, controllers and views?

Does anyone know where i can put a helper method so it can be accessed
from ANYWHERE?  ie from a model, a controller or a view?

Currently i''ve got model helper methods in lib/model_extensions.rb,
controller helper methods in application.rb and view helper methods in
application_helper.rb.
But there''s lots of things (usually text helpers) that i want to be
available to anything.

There must be a place for these, but does anyone know where?

thanks
max
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zer0ne

2007-Sep-20 13:24 UTC

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Re: Helper method for models, controllers and views?

Hi max.
I tried to understand you :D  Because my english not enough.

Anyway  the helpers are in our helper directories as you know.
We can use them in our views. But the important point,
if you wanna write your own helper and you wanna use it
all your views you must write your helper to application_helper.rp
For example.
  i use this def
----------------- application_helper.rb-----------------
  def  my_helper(number)
      number_to_currency(number)
  end


and in my view
------------   list.rhtml ---------

Price: <%= my_helper(book.price) %>

that is it.

my explorer show this:

Price:


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Max Williams

2007-Sep-20 13:51 UTC

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Re: Helper method for models, controllers and views?

Alper Türker wrote:
 But the important point,> if you wanna write your own helper and you wanna use it
> all your views you must write your helper to application_helper.rp
> Hi Alper - i''m sorry, but you did misunderstand my question.  I was 
asking if it''s  possible to put a single helper method in a single
place
so that it can be used in all views, models *and* controllers.

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Bob Showalter

2007-Sep-20 14:38 UTC

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Re: Helper method for models, controllers and views?

On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Does anyone know where i can put a helper method so it can be accessed
> from ANYWHERE?  ie from a model, a controller or a view?
>
> Currently i''ve got model helper methods in
lib/model_extensions.rb,
> controller helper methods in application.rb and view helper methods in
> application_helper.rb.
> But there''s lots of things (usually text helpers) that i want to
be
> available to anything.
>
> There must be a place for these, but does anyone know where?
You can put stuff in lib/ and "require" it from config/environment.rb

Typically you would define methods in a module that would be mixed in
when needed using "include".

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Max Williams

2007-Sep-20 16:30 UTC

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Re: Helper method for models, controllers and views?

Bob Showalter wrote:> On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>> There must be a place for these, but does anyone know where?
> You can put stuff in lib/ and "require" it from
config/environment.rb
> 
> Typically you would define methods in a module that would be mixed in
> when needed using "include".
Hmm, can''t get this to work...

I made a file called general_helpers.rb and put it in my lib folder.  It 
has this:

module GeneralHelpers
  def hello
    "hello world!"
  end
end

then, in one of my views, i have

include ''general_helpers''

<span><%= hello %></span>

And this generates an "unknown method or attribute "hello""
error.

(I already do something similar with a module called ModelExtensions, in 
lib/model_extensions.rb, which i require in my environment file.  The 
methods in there can be used by models, but not views or controllers.)
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Jonathan Rochkind

2007-Sep-20 16:52 UTC

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Re: Helper method for models, controllers and views?

There are probably several ways to do this. Me, I''d just make it a
class
method on the model (odds are, it''s really business logic that belongs 
to the model).

class MyModule
 def self.whatever
  # whatever
 end
end

Somewhere else, call:

MyModule.whatever()

It won''t have access to instance data and methods with self. of course,
but if you want it to be callable from model, view, and controller, then 
what instance data would it have access to anyway? Model and 
view/controller usually have completely distinct methods and accessors!

If your model and view/controller are going to have some methods in 
common, and you want this ''helper'' to take advantage of them,
then
you''ve got to go the module include route others have said.

Jonathan

Max Williams wrote:> Does anyone know where i can put a helper method so it can be accessed
> from ANYWHERE?  ie from a model, a controller or a view?
> 
> Currently i''ve got model helper methods in
lib/model_extensions.rb,
> controller helper methods in application.rb and view helper methods in
> application_helper.rb.
> But there''s lots of things (usually text helpers) that i want to
be
> available to anything.
> 
> There must be a place for these, but does anyone know where?
> 
> thanks
> max
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Rob Biedenharn

2007-Sep-20 17:01 UTC

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Re: Helper method for models, controllers and views?

On Sep 20, 2007, at 12:30 PM, Max Williams wrote:> Bob Showalter wrote:
>> On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>> There must be a place for these, but does anyone know where?
>> You can put stuff in lib/ and "require" it from
config/environment.rb
>>
>> Typically you would define methods in a module that would be mixed in
>> when needed using "include".
>
> Hmm, can''t get this to work...
>
> I made a file called general_helpers.rb and put it in my lib  
> folder.  It
> has this:
>
> module GeneralHelpers
>   def hello
>     "hello world!"
>   end
> end
>
> then, in one of my views, i have
>
> include ''general_helpers''
include GeneralHelpers
>
> <span><%= hello %></span>
>
> And this generates an "unknown method or attribute
"hello"" error.
>
> (I already do something similar with a module called  
> ModelExtensions, in
> lib/model_extensions.rb, which i require in my environment file.  The
> methods in there can be used by models, but not views or controllers.)
Under Rails, you don''t even have to require
''general_helpers'' as it
will be autoloaded.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org

Max Williams

2007-Sep-20 17:10 UTC

head link

Re: Helper method for models, controllers and views?

Rob Biedenharn wrote:> On Sep 20, 2007, at 12:30 PM, Max Williams wrote:
>> I made a file called general_helpers.rb and put it in my lib  
>>
>> include ''general_helpers''
> 
> include GeneralHelpers
> Under Rails, you don''t even have to require
''general_helpers'' as it
> will be autoloaded.
> 
> -Rob
> 
> Rob Biedenharn    http://agileconsultingllc.com
> Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
Thanks rob - this is still crashing with an "unknown method" problem 
though.  I''m not doing anything in environment.rb, just saying, in my 
view page:

include GeneralHelpers

<span><%= hello %></span>
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Jonathan Rochkind

2007-Sep-20 17:12 UTC

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Re: Helper method for models, controllers and views?

I''ve noticed that sometimes the stack trace stops at the .rhtml file, 
when the error was really in the method being called. Is there something 
in the ''hello'' method definition that could be raising the
method not
found exception?

ruby-debug may be helpful for debugging. It works well with Rails.

Max Williams wrote:> Rob Biedenharn wrote:
>> On Sep 20, 2007, at 12:30 PM, Max Williams wrote:
>>> I made a file called general_helpers.rb and put it in my lib  
>>>
>>> include ''general_helpers''
>> 
>> include GeneralHelpers
> 
>> Under Rails, you don''t even have to require
''general_helpers'' as it
>> will be autoloaded.
>> 
>> -Rob
>> 
>> Rob Biedenharn    http://agileconsultingllc.com
>> Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
> 
> Thanks rob - this is still crashing with an "unknown method"
problem
> though.  I''m not doing anything in environment.rb, just saying, in
my
> view page:
> 
> include GeneralHelpers
> 
> <span><%= hello %></span>
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Bob Showalter

2007-Sep-20 17:22 UTC

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Re: Helper method for models, controllers and views?

On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Bob Showalter wrote:
> > On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
> >> There must be a place for these, but does anyone know where?
> > You can put stuff in lib/ and "require" it from
config/environment.rb
> >
> > Typically you would define methods in a module that would be mixed in
> > when needed using "include".
>
> Hmm, can''t get this to work...
>
> I made a file called general_helpers.rb and put it in my lib folder.  It
> has this:
>
> module GeneralHelpers
>   def hello
>     "hello world!"
>   end
> end
>
> then, in one of my views, i have
>
> include ''general_helpers''
wrong syntax. include takes a module name.
>
> <span><%= hello %></span>
You''ll have to put

   include GeneralHelpers

into class ApplicationHelper (in app/helpers/application_helper.rb) in
order for those to be available in your views.

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Rob Biedenharn

2007-Sep-20 17:27 UTC

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Re: Helper method for models, controllers and views?

On Sep 20, 2007, at 1:10 PM, Max Williams wrote:> Rob Biedenharn wrote:
>> On Sep 20, 2007, at 12:30 PM, Max Williams wrote:
>>> I made a file called general_helpers.rb and put it in my lib
>>>
>>> include ''general_helpers''
>>
>> include GeneralHelpers
>
>> Under Rails, you don''t even have to require
''general_helpers'' as it
>> will be autoloaded.
>>
>> -Rob
>
> Thanks rob - this is still crashing with an "unknown method"
problem
> though.  I''m not doing anything in environment.rb, just saying, in
my
> view page:
>
> include GeneralHelpers
>
> <span><%= hello %></span>
I think that you actually want to extend the view object with this  
method so do:

extend GeneralHelpers

and see if that fixes the problem.  ''include'' is to give
instance
methods to a class/module while ''extend'' is to give methods to
the
object itself (frequently for class methods, but also on individual  
objects).

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org

Max Williams

2007-Sep-20 17:32 UTC

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Re: Helper method for models, controllers and views?

Bob Showalter wrote:> On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>
>>
>> include ''general_helpers''
> 
> wrong syntax. include takes a module name.
> 
>>
>> <span><%= hello %></span>
> 
> You''ll have to put
> 
>    include GeneralHelpers
> 
> into class ApplicationHelper (in app/helpers/application_helper.rb) in
> order for those to be available in your views.
ahh, i didn''t realise it had to be in ApplicationHelper...ok, that 
works.

Putting the same line in application.rb allows me to use the method in 
controllers as well.  So, 2 out of 3 so far! :)

However, i also put the same line in model_extensions, which gives 
methods that can be called by any model.  But, when i try to call the 
method inside one of my model''s methods i get an "unknown method 
"hello"" error again.

Thanks for your help - do you know why i''m not picking it up in my 
models?
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Max Williams

2007-Sep-20 17:37 UTC

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Re: Helper method for models, controllers and views?

Max Williams wrote:> Bob Showalter wrote:
> However, i also put the same line in model_extensions, which gives 
> methods that can be called by any model.  But, when i try to call the 
> method inside one of my model''s methods i get an "unknown
method
> "hello"" error again.
> 
> Thanks for your help - do you know why i''m not picking it up in my
> models?Btw, this might be to do with the fact that ModelExtensions is itself a
module - can you include a module in another module?
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Bob Showalter

2007-Sep-20 17:48 UTC

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Re: Helper method for models, controllers and views?

On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Max Williams wrote:
> > Bob Showalter wrote:
>
> > However, i also put the same line in model_extensions, which gives
> > methods that can be called by any model.  But, when i try to call the
> > method inside one of my model''s methods i get an
"unknown method
> > "hello"" error again.
> >
> > Thanks for your help - do you know why i''m not picking it up
in my
> > models?
> Btw, this might be to do with the fact that ModelExtensions is itself a
> module - can you include a module in another module?
Yes, you can include a module in another module.

I''m not familiar with ModelExtensions, but something like this should
work (put it in your general_helpers.rb)

module ActiveRecord
  class Base
    include GeneralHelpers
  end
end

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Max Williams

2007-Sep-20 19:17 UTC

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Re: Helper method for models, controllers and views?

Bob Showalter wrote:> On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>> > models?
>> Btw, this might be to do with the fact that ModelExtensions is itself a
>> module - can you include a module in another module?
> 
> Yes, you can include a module in another module.
> 
> I''m not familiar with ModelExtensions, but something like this
should
> work (put it in your general_helpers.rb)
> 
> module ActiveRecord
>   class Base
>     include GeneralHelpers
>   end
> end
That doesn''t seem to work for me...let me just run through what i have 
now as i may have got confused somewhere.

I have a file in the lib folder called "general_helpers.rb" with

  module GeneralHelpers
    def hello
      "hello world!"
    end

  end

  module ActiveRecord
    class Base
      include GeneralHelpers
    end
  end

And i have a method in my Movie model that looks like this:


  def hello_test
    return hello
  end

when i call this method on an instance of type Movie (in a view) i get

"undefined local variable or method `hello'' for
#<Movie:0x44c9a38>"

I tried restarting the server just in case, but it didn''t help...
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Bob Showalter

2007-Sep-20 20:01 UTC

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Re: Helper method for models, controllers and views?

On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Bob Showalter wrote:
> > On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
> >> > models?
> >> Btw, this might be to do with the fact that ModelExtensions is
itself a
> >> module - can you include a module in another module?
> >
> > Yes, you can include a module in another module.
> >
> > I''m not familiar with ModelExtensions, but something like
this should
> > work (put it in your general_helpers.rb)
> >
> > module ActiveRecord
> >   class Base
> >     include GeneralHelpers
> >   end
> > end
>
> That doesn''t seem to work for me...let me just run through what i
have
> now as i may have got confused somewhere.
>
> I have a file in the lib folder called "general_helpers.rb" with
>
>   module GeneralHelpers
>     def hello
>       "hello world!"
>     end
>
>   end
>
>   module ActiveRecord
>     class Base
>       include GeneralHelpers
>     end
>   end
>
> And i have a method in my Movie model that looks like this:
>
>
>   def hello_test
>     return hello
>   end
>
> when i call this method on an instance of type Movie (in a view) i get
>
> "undefined local variable or method `hello'' for
#<Movie:0x44c9a38>"
>
> I tried restarting the server just in case, but it didn''t help...
If you go into script/console and do this, it should work:

   >> GeneralHelpers
   GeneralHelpers
   >> Movie.new.hello
   "hello world!"

The problem is that nothing is causing general_helpers.rb to be
loaded. I forced it to load by referencing the module name as the
first thing.

You''ll need to go ahead and add to config/environment.rb (put it at the
bottom)

  require ''general_helpers''

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Max Williams

2007-Sep-20 20:23 UTC

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Re: Helper method for models, controllers and views?

Bob Showalter wrote:> On 9/20/07, Max Williams
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>> > work (put it in your general_helpers.rb)
>> I have a file in the lib folder called "general_helpers.rb"
with
>>       include GeneralHelpers
>> when i call this method on an instance of type Movie (in a view) i get
>>
>> "undefined local variable or method `hello'' for
#<Movie:0x44c9a38>"
>>
>> I tried restarting the server just in case, but it didn''t
help...
> 
> If you go into script/console and do this, it should work:
> 
>    >> GeneralHelpers
>    GeneralHelpers
>    >> Movie.new.hello
>    "hello world!"
> 
> The problem is that nothing is causing general_helpers.rb to be
> loaded. I forced it to load by referencing the module name as the
> first thing.
> 
> You''ll need to go ahead and add to config/environment.rb (put it
at the
> bottom)
> 
>   require ''general_helpers''
Thanks again Bob, but still no joy.  Even the console doesn''t work - it
seems to load the GeneralHelpers class ok, but give an "unrecognised 
method" error for hello.  I must have done something wrong somewhere, i 
have no ide what though.
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Rails - Sep 2007 - Helper method for models, controllers and views?

Helper method for models, controllers and views?

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Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

Re: Helper method for models, controllers and views?

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