Yet another word to the wise: take care of your ordering of the ‘extends’ configuration files within your buildout. It makes complete sense, and especially so with respect to version pinning: the later configuration’s versions will be the last one applied.
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Disclaimer: this post isn’t giving relationship advice (or..it is in some twisted way). Unsurprisingly, removing content in Plone via the ZMI when Plone says something can’t be deleted is likely to cause problems.
In my case, the fact I removed a Dexterity-based container (“Project”) caused users to no longer add or edit content of my Project type. The reason for this boiled down to my use of RelationChoice fields, in order link Projects to Person objects and vice versa. The backend storage for the RelationChoice field is an instance of z3c.relationfield.index.RelationCatalog, and this keeps records of where the relations are going to and going from.
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A nice ‘gotcha’ is the distinction between Zope’s schema.Date and schema.Datetime. The difference is obvious and straightforward when the two terms are laid out side-by-side: one is for dates only and the other adds a time component. Where things fell down for me in my usage of these fields with a Dexterity-based content type in Plone is the human component. When these fields are mashed in together within a lot of other text/Python/names, it’s easy to miss those 4 little letters of ‘time’. This lead me trying to use a DatetimeFieldWidget when I really could only use a DateFieldWidget. Wrong widget for the wrong type = unpredictable.
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Today, we’re looking at how to utilise computed fields within a Dexterity-based content type. The specific use-case is that of having two separate fields (first name and surname, for a Person type, for example) generate the complete object title. The first part of this — having the title of the content displayed correctly — is pretty straight forward once you know what documentation to read and understand how things happen. The second part — having the ID of the content correctly generated to be first name/surname is slightly more complicated.
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