Rails - Jul 2006 - How do I change :type attribute in a view?

I''m using single table inheritance and want to change the :type 
attribute from an admin view.  How do I do this given that :type has to 
be handled with special care?

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Jose Hales-garcia wrote:
> I''m using single table inheritance and want to change the :type 
> attribute from an admin view.  How do I do this given that :type has to 
> be handled with special care?
type is protected from mass assignment so you have to do something like:

@model = Model.find(params[:id])
@model[:type] = params[:model][:type]
@model.update_attributes(params[:model])

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We develop, watch us RoR, in numbers too big to ignore.

Mark Reginald James wrote:
> Jose Hales-garcia wrote:
>> I''m using single table inheritance and want to change the
:type
>> attribute from an admin view.  How do I do this given that :type has to
>> be handled with special care?
> 
> type is protected from mass assignment so you have to do something like:
> 
> @model = Model.find(params[:id])
> @model[:type] = params[:model][:type]
> @model.update_attributes(params[:model])
Thank you on the advice for the controller code.  But I''m getting an 
error in the view (see below).  Are there special techniques for 
handling the :type attribute inside of a view?

wrong argument type String (expected Module)
Extracted source (around line #12):

9: 					<td></td>
10: 				</tr>
11: 				<tr>
12: 					<td><%= select :document, :type, 
ApplicationHelper::DOCUMENT_TYPES %></td>
13: 					<td></td>
14: 				</tr>
15: 				<tr>

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Jose Hales-Garcia wrote:
> Thank you on the advice for the controller code.  But I''m getting
an
> error in the view (see below).  Are there special techniques for 
> handling the :type attribute inside of a view?
> 
> wrong argument type String (expected Module)
> Extracted source (around line #12):
> 
> 12: <td><%= select :document, :type,
ApplicationHelper::DOCUMENT_TYPES %></td>

Yes, it''ll be using the Ruby built-in type method rather than the
AR type attribute method because the latter uses method_missing.

You''ll have to do one of three things:

1. Change to a different attribute name using set_inheritance_column
2. Add a method to the document model so that type can be accessed under
    a different method name
3. Code as:
    select_tag ''document[type]'',
      options_for_select(ApplicationHelper::DOCUMENT_TYPES, @document[:type])

-- 
We develop, watch us RoR, in numbers too big to ignore.