[html-formfu] Model::DBIC: additive mode for many_to_many and multi select fields

[Moritz Onken]

Hi Carl,

attached is a patch which adds support for "add_to_$rel" instead of  
"set_$rel" for many_to_many relationships and select-like fields.

The reason for this is that I want to create a form, where the user  
can choose a single element from a select box. This element should  
then be added to the m2m relationship. The current implementation did  
not allow this (I think :-) ).

And I found a minor inconsistency. If model_config is set model::dbic  
sets the default resultset to ucfirst $name. This is only done if  
stash->{schema} is set, not in a catalyst environment. Patch is  
included.

Hope you like it :-)

cheers,

moritz


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