Steve Hannah wrote:
> Hi,
>
> I would like to add some different image sizes to the image in
> ATNewsItem. Someone on IRC suggested that the best way to do this is
> by subclassing ATNewsItem. If I did it this way, it is important
> that my new type is a drop-in replacement for ATNewsItem so that all
> of the existing ATNewsItem objects in the site get converted to
> become objects of my custom NewsItem type and any part of the site
> that previously used ATNewsItems would know to use my custom type.
> (i.e. it should be seamless to the end user of the site).
You need to write migration for this. RichDocument tutorial covers how
to do this too.
> I have created custom content types before but they have all been of
> the variety that shows up as a completely separate content type (i.e.
> they didn't replace existing content types). I have read through the
> tutorial on RichDocument but I don't think that the examples there
> show how to replace the existing Document type with RichDocument - it
> just makes an additional RichDocument type available.
Which is what you should do. You can give it an archetype_name of 'News'
and then just diable global_allow for the standard News content type and
no-one will know the difference. You *could* do a full-on replacement,
i.e. have the same portal_type, like ATContentTypes migration does, but
trust me, it's almost certainly not worth the pain.
If you need to convert existing items, do a migration script.
Martin
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