Rails core - Nov 2006 - has_many :through extended with writer and clear methods

I hope this hasn''t been asked yet.  I couldn''t find it if it
was.

I''ve extended the has_many through association to include a clear
method as well as adding a mass assignment for the collection.

I wanted to know if what I am doing is sane and/or if it is redundant
because it is already being worked into rails edge.

The full description and code is at
http://www.nkryptic.com/2006/11/12/make-has_many-through-more-like-has_many

If there is a better way to handle this, or if there is some reason
that what I''m doing will cause other problems, please let me know.
Otherwise, feel free to use it.

Jacob


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I hope this hasn''t been asked yet.  I couldn''t find it if it
was.

I''ve extended the has_many through association to include a clear
method as well as adding a mass assignment for the collection.

I wanted to know if what I am doing is sane and/or if it is redundant
because it is already being worked into rails edge.

The full description and code is at
http://www.nkryptic.com/2006/11/12/make-has_many-through-more-like-has_many

If there is a better way to handle this, or if there is some reason
that what I''m doing will cause other problems, please let me know.
Otherwise, feel free to use it.

Jacob


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> I''ve extended the has_many through association to include a clear
> method as well as adding a mass assignment for the collection.
I dunno that I see the need for this.  If the instances of the
:through association don''t matter,  just use has_and_belongs_to_many.
If they do matter, then you should be constructing them yourself in
code.

> I wanted to know if what I am doing is sane and/or if it is redundant
> because it is already being worked into rails edge.
>
> The full description and code is at
> http://www.nkryptic.com/2006/11/12/make-has_many-through-more-like-has_many
>
> If there is a better way to handle this, or if there is some reason
> that what I''m doing will cause other problems, please let me know.
> Otherwise, feel free to use it.
>
> Jacob
>
>
> >
>

-- 
Cheers

Koz

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I stumbled across this same issue recently as well.  I haven''t seen
anything like it in edge.  The only difficulty I foresee is associating
objects if one hasn''t been saved to the database.

I think a few other changes would be needed in other places to really
take advantage of this.  For example, say you have an edit form for
Group and have a list of Users that are joined through Membership. if
you deselect all Users, nothing will get passed through as a parameter
to the update request.  In that case, the update_attributes method
should know that getting no Users back as a parameter means to remove
all Users from the Group.

Here is my write up of the problem
http://blog.tuples.us/?p=46

Jordan


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