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POPutting in extra restrictions when filtering on foreignkey in django-admin
 

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    <p>When getting members based on Unit, I only want to get the ones who are <em>actually in that unit as of now</em>.</p> <p>I've got a model looking like this:</p> <pre><code>class Member(models.Model): name = models.CharField(max_length=256) unit = models.ManyToManyField(Unit, through='Membership') class Membership(models.Model): member = models.ForeignKey(Member) unit = models.ForeignKey(Unit) start = models.DateField(default=date.today) stop = models.DateField(blank=True, null=True) class Unit(models.Model): name = models.CharField(max_length=256) </code></pre> <p>As you can see, members can have a "fake" membership in unit, that is only history and should not be considered in the searches and listings of the admin. They <em>should</em> be shown in the change-page for a single object though.</p> <p>The admin looks like this:</p> <pre><code>class MembershipInline(admin.TabularInline): model = Membership extra = 1 class MemberAdmin(admin.ModelAdmin): list_filter = ('unit',) inlines = [MembershipInline,] </code></pre> <p>So how can I (if at all possible this way), when filtering on unit only get those units whose <code>membership__stop__isnull=True</code>?</p> <p>I tried Managers, I can make them work on the model in the admin itself, but not on the filtering/searches. There is also a <code>def queryset(self)</code> method that is overrideable, but I can't wrap my head around how to use it to fix my problem.</p> <p><strong>Edit</strong>, how this is used: A member has only one membership in a unit, however, they could be members from before, but they are ended (with stop). So I only want to filter (and show, in the list view) those members who have an open-ended membership (like, that they are members of that unit now).</p> <p>Any ideas?</p>
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