I would like to create a view for multiple object deletion. For this, I thought I could use a modelformset_factory
.
This are my models:
class Item(models.Model):
rfid_tag = models.CharField()
asset = models.OneToOneField('Assets', default=None, null=True,
on_delete=models.SET_DEFAULT,)
date = models.DateTimeField(name='timestamp',
auto_now_add=True,)
...
class Assets(models.Model):
id = models.AutoField(db_column='Id', primary_key=True)
assettag = models.CharField(db_column='AssetTag', unique=True, max_length=10)
assettype = models.CharField(db_column='AssetType', max_length=150)
...
class Meta:
managed = False
db_table = 'Assets'
ordering = ['assettag']
def __str__(self):
return f"{self.assettag}"
def __unicode__(self):
return f"{self.assettag}"
Below is the form and formset factory:
class ItemDelete(forms.ModelForm):
asset = forms.CharField(required=True,
help_text= "Item asset tag",
max_length=16,
)
delete = forms.BooleanField(required=False,
label="Delete",
help_text='Check this box to delete the corresponding item',
)
class Meta:
model = Item
fields = ['asset']
ItemDeleteMultiple= forms.modelformset_factory(model=Item,
form=ItemDelete,
extra=0,
)
The view:
class DeleteMultipleView(generic.FormView):
template_name = *some html file*
form_class = ItemDeleteMultiple
success_url = *some url*
def form_valid(self, form):
return super().form_valid(form)
And the template:
{% extends "pages/base.html" %}
{% block title %}
<title>Delete Multiple</title>
{% endblock %}
{% block static %}
{% load static %}
{% endblock %}
{% block content %}
<h1>Delete Multiple Items</h1>
<form class="item_delete_multiple_form" action ="." method="POST"> {% csrf_token %}
<table border="2">
<tr><th colspan="3" scope="row">Select Items to Delete</th></tr>
{% for item_form in form %}
<tr>
{% if item_form.non_field_errors %}
<td>{{ item_form.non_field_errors }}</td>
{% endif %}
{% if item_form.asset.errors %}
<td>{{item_form.asset.errors}}</td>
{% endif %}
<td><label for="{{ item_form.asset.id_for_label }}">AssetTag {{forloop.counter}}:</label></td>
<td>{{item_form.asset}}</td>
{% if item_form.delete.errors %}
<td>{{item_form.delete.errors}}</td>
{% endif %}
<td>{{item_form.delete}}</td>
</tr>
{% endfor %}
</table>
</form>
{% endblock %}
{% block script %}
{% endblock %}
The template is not very easy to the eye, so here is the important part: <td>{{item_form.asset}}</td>
.
The issue is the following:
If I don't add the asset = CharField()
part in the ItemDelete
form, the template will render what the __str__ / __unicode__
method of the Assets
model will return (the assettag field) in a choice field.
If the asset field is a CharField
in the form, the template will render the id of the Assets
. The database entry in the Item
table.
I would like to render asset.assettag
in a CharField (read only text input). Is it possible to do this?
Or is there a better way to achieve the multiple delete operation, using a list of objects and a checkbox?
I have came to the following solution:
class ItemDelete(forms.ModelForm):
asset = forms.CharField(required=True,
help_text= "Item asset tag",
max_length=16,
disabled=True,
)
delete = forms.BooleanField(required=False,
label="Delete",
help_text='Check this box to delete the corresponding item',
)
def __init__(self, *args, **kwargs):
super(ItemDelete,self).__init__(*args, **kwargs)
self.initial['asset'] = Assets.objects.get(id=self.initial['asset']).assettag
class Meta:
model = Item
fields = ['asset']
Given that the input field is used just for presentation purposes (is disabled and cannot be edited), I think it will do. The downside is that it will hit the database for every object (being a formset, every object will have it's own form).
I am still open to better suggestions.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.