Re: How to store multiple instances of a single object in the database

Have you considered using the 'through' argument for the many to many field?  This lets you specify your own intermediate table to which you can add extra data.  So you could add in a quantity field so you would know how many of each molecule you need.

Here is the documentation: http://docs.djangoproject.com/en/1.3/topics/db/models/#intermediary-manytomany

Hope this helps,

Ryan

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