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    <p>OK so the first two answers I got have now been contradicted by others. I've been researching this and I'm going to take a stab at answering it myself. Please vote if you think this is correct and/or comment if you disagree with my reasoning.</p> <ul> <li><p>Methods on models should accept objects and lists of objects, not ids as int/long or lists of id's or anything like that. This is because it will probably be called from a view or form and they have access to full objects from <code>cleaned_data</code> dict. The <code>create()</code> method on manager classes are another example where django itself accepts objects.</p></li> <li><p>The caller of the model layer methods should look up and convert the id's into full objects.</p></li> <li><p>You can override <code>save()</code> but if you do, you should be careful to accept <code>args</code> and <code>**kwargs</code></p></li> <li><p>If the models span applications, you should consider signals instead of overriding <code>save</code></p></li> <li><p>Don't try to get clever overriding the model manager <code>create</code> method. It wont get called if the view layer creates a new object and saves it. If you need to do extra processing before the save, you can override <code>save</code> or <code>__init__</code> or catch a signal. if you override <code>__init__</code> you can check for a pk to determine if it exists in the db yet or not.</p></li> </ul> <p>I'm going to put my create code in a separate method for now until I figure out which of the techniques I like best.</p> <p>I think this is a good set of guidelines for adding methods to the model layer. Anything I missed?</p>
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    1. POWhat kind of data do I pass into a Django Model.save() method?
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