[Django] #25023: Many to Many through - save new Data

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Jun 25, 2015, 5:50:21 AM6/25/15

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#25023: Many to Many through - save new Data
--------------------------------------+--------------------
Reporter: trap12 | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Forms | Version: 1.8
Severity: Release blocker | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Hi,

I am new in Django and have problems with the M2M-Fields with a custom
join table (through). I want to to save new Data (no duplicate). But the
form shows me just the data in the db, which I can select.
I have no access to the through-table "RecipeIngredients" which links the
ingredient with the recipe and holds the quantity.

I want to have a dynamic field, where I can add also new ingredient, which
are not in the db. And I want to add the field quanity in the RecipeForm.
(problem: the quantity field is not in the model Recipe, it is in the
RecipeIngredients)

models.py:
{{{
class Ingredient(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=200)

class Recipe(models.Model):
id = models.AutoField(primary_key=True)
recipename = models.CharField(max_length=200)
author = models.ForeignKey(Student, null=True)
pub_date = models.DateTimeField('date published', editable=False)
ingredients = models.ManyToManyField(Ingredient,
through='Recipeingredients')
description = models.CharField(max_length=20000)

class Recipeingredients(models.Model):
id = models.AutoField(primary_key=True)
ingredient = models.ForeignKey(Ingredient)
recipe = models.ForeignKey(Recipe)
quantity = models.CharField(max_length=30)
}}}

forms.py:

{{{

class RecipeForm(forms.ModelForm):
class Meta:
model = Recipe
exclude = ('id', 'author', 'pub_date')

}}}

views.py:

{{{

@login_required
def create(request):
if request.method == 'POST':
form = RecipeForm(user=request.user, data=request.POST)
if form.is_valid():
recipe = form.save()

return HttpResponseRedirect(recipe.get_absolute_url())
else:
form = RecipeForm()

return render(request, 'recipes/create.html', {'form': form}}

}}}
create.html:

{{{
<form action="{{ action_url }}" method="post" accept-charset="utf-8">
{{ form.as_p }}
{% csrf_token %}

<p><input type="submit" value="Save"/></p>
</form>
}}}

Like I said, I have no textfield to add new ones.

Do you know what I have to change?

thanks in advance!!!

regards,
trap123

--
Ticket URL: <https://code.djangoproject.com/ticket/25023>
Django <https://code.djangoproject.com/>
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Django

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Jun 25, 2015, 10:01:27 AM6/25/15

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#25023: Many to Many through - save new Data

Easy pickings: 0 | UI/UX: 0

-------------------------------------+-------------------------------------
Changes (by MoritzS):

* status: new => closed
* severity: Release blocker => Normal
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
* resolution: => invalid

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