Re: Admin many-to-many inlines - show editable fields from parent models

On Tue, Nov 28, 2017 at 9:12 AM, Jan Hartman <android4m3@gmail.com> wrote:

Hi, I'm having trouble with inlining models with a many-to-many relationship through the intermediary model. My models are recipes and categories (a category includes multiple recipes and a recipe can belong to multiple categories).

Models (simplified):

class Recipe(models.Model):

title = models.CharField(_('Title'), max_length=100, unique=True)

categories = models.ManyToManyField('Category', through='PairRecipeCategory', verbose_name=_('Categories'))

class Category(models.Model):

title = models.CharField(_('Title'), max_length=100, unique=True)

recipes = models.ManyToManyField('Recipe', through='PairRecipeCategory', verbose_name=_('Recipes'))

class PairRecipeCategory(models.Model):

category = models.ForeignKey(Category, on_delete=models.CASCADE)

recipe = models.ForeignKey(Recipe, on_delete=models.CASCADE)

Admin:

class RecipeInline(admin.TabularInline):

model = PairRecipeCategory

# fields = ['recipe__title']

class CategoryInline(admin.TabularInline):

model = PairRecipeCategory

# fields = ['category__title']

+ ordinary recipe and category ModelAdmin classes

What I want to do is to show editable fields from the parent model (Recipe or Category) in the inlined PairRecipeCategory model instead of just listing the inlines. I get the "Unknown field for model xyz error" because the fields are not reachable from the intermediary model if I uncomment the fields lines.
I've read about this on StackOverflow and such and I could not find a working solution. If anyone has any (even hacky) ideas, I would really appreciate the help.

I think that you are creating an inline for the intermediary model. not an inline for the other model, here is how you should:

https://docs.djangoproject.com/en/1.11/ref/contrib/admin/#working-with-many-to-many-models

And your code is for doing this:

https://docs.djangoproject.com/en/1.11/ref/contrib/admin/#working-with-many-to-many-intermediary-models

HTH :)

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