Shortcut for admin inlines

[radiac]

Add a shortcut for admin inlines - pick up when inlines contains a bare Model, or a model class name, and create a basic inline for it.

I'm going to say inline options are out of scope. I can think of lots of ways to implement it, but the main goals of this project are to streamline the simplest option and let you knock out prototypes quickly and cleanly by reducing boilerplate. Trying to support inline options in a decorator would make it more complicated to use and implement, and make the admin decorator harder to read.

In that spirit, I think it'll make sense to use a StackedInline with no option to override - it scales better than Tabular, so is a better default. If someone wants a Tabular they (a) know about it, and (b) they can write it out manually, it's only 4 lines.

I did wonder if adding this could confuse newcomers, but there's already a lot of special stuff in nanodjango, and convert will show them the correct way.

class SubThing(models.Model):
    thing = models.ForeignKey("Thing")
    name = models.CharField(max_length=255)

@app.admin(inlines=[SubThing, "OtherSubThing"])
class Thing(models.Model):
    name = models.CharField(max_length=255)

class OtherSubThing(models.Model):
    thing = models.ForeignKey("Thing")
    name = models.CharField(max_length=255)

Inlines will be defined and converted as:

class SubThingInline(admin.StackedInline):
    model = SubThing
    extra = 1