Re: Can't make ManyToMany form fields hidden

[Eric Abrahamsen]

Collin Anderson  writes:

> https://code.djangoproject.com/ticket/24453

For posterity: I should have been using a forms.MultipleHiddenInput
widget for the ManyToManyField, rather than a plain old
forms.HiddenInput.

> On Wednesday, March 4, 2015 at 12:40:40 AM UTC-5, Eric Abrahamsen
> wrote:
>
> Hi, 
>
> I'm making some heavily customized model formsets, to encourage my
> users 
> to input data. Mostly that involves cutting down the number of
> huge 
> drop-down menus they have to go surfing through. 
>
> So I have a model like this: 
>
> class Work(models.Model): 
> authors = models.ManyToManyField
> (Author,blank=True,related_name="works") 
>
> I first present them with a pre-query form, to choose an Author,
> then 
> give them a Work modelformset with the "authors" field pre-filled
> with 
> that author. So the initial data sort of looks like: 
>
> init["authors"] = [pre_query.cleaned_data["authors"]] # must be a
> list 
>
> for i in range(0, number_of_additional_forms): 
> initial.append(init) 
>
> formset = WorkFormSet(queryset=Work.objects.none(),
> initial=initial) 
>
> Nothing unusual there. Now I want to make the "authors" field
> hidden. 
> This is both to reassure my users, and to reduce the size of the
> page -- 
> these are really long dropdowns. 
>
> Adding the hidden widget to the "authors" field, however, gives me
> this 
> validation error: 
>
> (Hidden field authors) Enter a list of values. 
>
> The form input field looks like this: 
>
>  value="[37L]" /> 
>
> Looks like a list of values to me, but maybe it's not getting read
> that 
> way. 
>
> In the meantime it's not a disaster if the monster "authors"
> dropdown is 
> visible for each of my Work forms, but it would be really nice to 
> eventually get it hidden. 
>
> In the past I did this by manually *removing* fields from the
> forms, and 
> adding the values in during the POST/save process, but that always
> felt 
> bad to me. 
>
> Thanks! 
> Eric 

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Re: Can't make ManyToMany form fields hidden

[Collin Anderson]

https://code.djangoproject.com/ticket/24453

On Wednesday, March 4, 2015 at 12:40:40 AM UTC-5, Eric Abrahamsen wrote:
>
> Hi, 
>
> I'm making some heavily customized model formsets, to encourage my users 
> to input data. Mostly that involves cutting down the number of huge 
> drop-down menus they have to go surfing through. 
>
> So I have a model like this: 
>
> class Work(models.Model): 
>   authors = models.ManyToManyField(Author,blank=True,related_name="works") 
>
> I first present them with a pre-query form, to choose an Author, then 
> give them a Work modelformset with the "authors" field pre-filled with 
> that author. So the initial data sort of looks like: 
>
> init["authors"] = [pre_query.cleaned_data["authors"]] # must be a list 
>
> for i in range(0, number_of_additional_forms): 
>   initial.append(init) 
>
> formset = WorkFormSet(queryset=Work.objects.none(), initial=initial) 
>
> Nothing unusual there. Now I want to make the "authors" field hidden. 
> This is both to reassure my users, and to reduce the size of the page -- 
> these are really long dropdowns. 
>
> Adding the hidden widget to the "authors" field, however, gives me this 
> validation error: 
>
> (Hidden field authors) Enter a list of values. 
>
> The form input field looks like this: 
>
>  value="[37L]" /> 
>
> Looks like a list of values to me, but maybe it's not getting read that 
> way. 
>
> In the meantime it's not a disaster if the monster "authors" dropdown is 
> visible for each of my Work forms, but it would be really nice to 
> eventually get it hidden. 
>
> In the past I did this by manually *removing* fields from the forms, and 
> adding the values in during the POST/save process, but that always felt 
> bad to me. 
>
> Thanks! 
> Eric 
>
>

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Can't make ManyToMany form fields hidden

[Eric Abrahamsen]

Hi,

I'm making some heavily customized model formsets, to encourage my users
to input data. Mostly that involves cutting down the number of huge
drop-down menus they have to go surfing through.

So I have a model like this:

class Work(models.Model):
  authors = models.ManyToManyField(Author,blank=True,related_name="works")

I first present them with a pre-query form, to choose an Author, then
give them a Work modelformset with the "authors" field pre-filled with
that author. So the initial data sort of looks like:

init["authors"] = [pre_query.cleaned_data["authors"]] # must be a list

for i in range(0, number_of_additional_forms):
  initial.append(init)

formset = WorkFormSet(queryset=Work.objects.none(), initial=initial)

Nothing unusual there. Now I want to make the "authors" field hidden.
This is both to reassure my users, and to reduce the size of the page --
these are really long dropdowns.

Adding the hidden widget to the "authors" field, however, gives me this
validation error:

(Hidden field authors) Enter a list of values.

The form input field looks like this:



Looks like a list of values to me, but maybe it's not getting read that
way.

In the meantime it's not a disaster if the monster "authors" dropdown is
visible for each of my Work forms, but it would be really nice to
eventually get it hidden.

In the past I did this by manually *removing* fields from the forms, and
adding the values in during the POST/save process, but that always felt
bad to me.

Thanks!
Eric

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