Comments on: Dynamic Columns with Ajax Scaffold

By: Jonathan Donaldson

Jonathan Donaldson — Sat, 28 Oct 2006 06:11:06 +0000

Scott,

First off, thanks for both the nice response, and the plugin…it is making my life much easier.

Second, once you showed this, I found (at least to me) an easier way to do the column filtering….

I went ahead and did the usual:



@@scaffold_columns = [

AjaxScaffold::ScaffoldColumn.new(...),

AjaxScaffold::ScaffoldColumn.new(...)

]

for each of the common columns (ones that each user should see), then I did this in the def create_columns:



def create_columns

     if @user.is_admin?

         @@scaffold_columns.insert(2,AjaxScaffold::ScaffoldColumn.new(…admin only column)

     end

end

you can use the array insert to put a column before or after any of the ones set previously…(integer after .insert( is the position)

Thanks again for all the hard work!

By: Scott Rutherford

Scott Rutherford — Sat, 28 Oct 2006 06:11:06 +0000

Hi Jonathon, that looks pretty neat. I suspect there are a few more ways too. All good.

Cheers
Scott.

By: Jonathan Donaldson

Jonathan Donaldson — Sat, 28 Oct 2006 06:11:06 +0000

Hmmm…my thought above works great in development, but once I tried in production mode, it looks like it caches the @@scaffold_columns and goes through create_colums each time, so I end up with lots if repeats of ‘admin’ columns…

any ideas?

By: Scott Rutherford

Scott Rutherford — Sat, 28 Oct 2006 06:11:06 +0000

Hi Jonathon, ah yes, should of thought of that. I think the hash direction I originally outlined would be your best bet. Then the actual column objects are only instantiated once but you can dynamically assign them on each request. As you completely overriding the @@scaffold_columns array you won’t have this problem.

Cheers
Scott.

By: Jorge L. Cangas

Jorge L. Cangas — Sat, 28 Oct 2006 06:11:06 +0000

Well I’m just starting with ajaxscaffold … My problem is I want show a *few* columns in the grid view and *many* columns in the edit view. I tried the @@scaffold_columns way and I think my problem is related with the previous comments, but I’m also new in Ruby. Can help me, please?

By: Scott Rutherford

Scott Rutherford — Sat, 28 Oct 2006 06:11:06 +0000

Hi Jorge, to do this you will need to use the @scaffold_columns to define the grid view and create a custom _form.rhtml template for the edit view.

Cheers
Scott.

By: Jorge L. Cangas

Jorge L. Cangas — Sat, 28 Oct 2006 06:11:06 +0000

Thanks a lot: just this was my intuitive guess, but I find for some most "generic": I have some internal fields I need in each table. My feeling is Ajax-Scaffold is very good at "entry level" but it goes difficultd in more complex views: A master/detail form fo example. Well maybe I must wait for AS 4.0 . I’m tried also streamlinned framework for the same, but it seems immature for now for my work. Sorry if all these feelings is my low expertise in RoR, I don’t sure but I’m learning hard
Thansk! (sorry also my limited english)

By: Jeff Wattenmaker

Jeff Wattenmaker — Sat, 28 Oct 2006 06:11:06 +0000

I tried implementing this with a controller and table that has:

:suffix => true

On my column hash I get an error:

uninitialized class variable @@columns_hash in TeamController

I have tried naming the hash both columns_hash and users_columns_hash with the same result.

this is the code in the controller.

@@users_columns_hash[:user] = AjaxScaffold::ScaffoldColumn.new(:name => ‘first’, :name => ‘last’)
@@users_columns_hash[:foo] = AjaxScaffold::ScaffoldColumn.new(:name => ‘email’)

I have also tried without the AjaxScaffold:: before ScaffoldColumn and same result.

Assume I am doing something wrong, can you help.

thanks.

Jeff