In a Django Formset being returned in a Post, all Forms are showing all fields changed even though none have

问题

This is a non-model based Form:

from django import forms


class MeasureForm(forms.Form):
    name = forms.CharField(max_length=15)
    description = forms.CharField(max_length=100)
    datatype = forms.CharField(max_length=20)
    uom = forms.Char

Populated from a non-model based view:

def define_measures(request):
    measureformset = formset_factory(MeasureForm, extra=2)
    if request.method == 'POST': # If the form has been submitted...
        formset = measureformset(request.POST ) # A form bound to the POST data
        if formset.is_valid(): # All validation rules pass
            for form in formset:
                print form.changed_data
            return HttpResponseRedirect('/viscas/measures') # Redirect after POST
    else:


        measures = cass.get_all_measures()

        list_dict =[]
        for measure in measures:
            list_dict.append({'name': measure.name, 'description': measure.description, 'datatype': measure.datatype, 'uom': measure.uom})

        formset = measureformset(initial=list_dict)

    return render(request, 'viscas/measure.html', {
        'formset': formset,
    })

Being rendered "manually" in a template:

{% extends "base.html" %}
{% block content %}
    <body>
    <div class="container">
        <form action="{% url 'viscas:define_measures' %}" method="post">
            {% csrf_token %}
            <div>
                <table class="table table-hover" name="poi" id="tagTable">
                    <thead>
                    <tr>
                        <th>UOM</th>
                        <th>Description</th>
                        <th>Datatype</th>
                        <th>UOM</th>
                    </tr>
                    </thead>
                    {% for form in formset %}
                        <tr>
                            <td>{{ form.name }}</td>
                            <td>{{ form.description }}</td>
                            <td>{{ form.datatype }}</td>
                            <td>{{ form.uom }}</td>
                            {% if form.errors %}
                                <tr>
                                    <td>{{ form.errors }}</td>
                                </tr>{% endif %}
                        </tr>
                    {% endfor %}
                </table>
                {{ formset.management_form }}
            </div>
            <p></p><input type="submit" value="Submit"/></p>
        </form>
    </div>
    </body>

{% endblock %}

The page displays beautifully, put if I post with no change whatsoever on the web-page, each form is showing all fields changed (except the two extra which come back blank).

from this code:

if request.method == 'POST': # If the form has been submitted...
    formset = measureformset(request.POST ) # A form bound to the POST data
    if formset.is_valid(): # All validation rules pass
        for form in formset:
            print form.changed_data

I get this output:

['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
['name', 'description', 'datatype', 'uom']
[]
[]

回答1:

I think your solution is rather simple. Just add {{ formset.management_form }} above {% for form in formset %} in your template. It's required to set up any formset in a template.

For more detail see the Django formset page.

来源：https://stackoverflow.com/questions/21174686/in-a-django-formset-being-returned-in-a-post-all-forms-are-showing-all-fields-c

标签

django

forms

django-forms

django-views

formset