i have a Problem which i am unsure what the most django/pythonic way to solve it would be.
I have the following models:
class Order(models.Model):
ord_someinformation = models.CharField(max_length=10)
class Articles(models.Model):
myFK = models.ForeignKey(Order)
detail_article= models.CharField(max_length=10)
so every Order can have multiple Order_Details think about it like a shopping basket where i have an Order and within it i have multiple articles.
I want to iterate over the orders and the articles within the template. I thought about something like.
myOrder = Order.objects.("" i have no idea what to put here "")
within the template i thought about something like this:
{% for order in myOrder %}
{{ order.ord_someinformation }}
{% for articles in order.articles %}
{{ detail_article }}
{% endif %}
{% endif %}
is this possible?
If so how ?
I don't know why you think you need to put anything there. You just want to send all the orders to the template, then iterate through them their articles there.
myOrder = Order.objects.all()
...
{% for order in myOrder %}
{{ order.ord_someinformation }}
{% for article in order.articles_set.all %}
{{ article.detail_article }}
{% endif %}
{% endif %}
Related
I have two tables I want to check if there is data or not!
Models:
class Children(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
photo = models.ImageField(blank=True, default='avatar.jpg')
class Groups(models.Model):
child = models.ForeignKey(Children, on_delete=models.CASCADE)
Templates:
{% if user.children_set.all.groups_set.all.exists %}
It's Like:
get_groups = Groups.objects.fitler(child__user=request.user).count
BUT I need this statement to be in templates, because I am trying to create for loop on User table:
{% for user in users %}
{{user.username}}
{% if user.children_set.all.groups_set.all.exists %}
Yes
{% else %}
No
{% endif %}
{% endfor %}
you can also use if condition in template if checking numbers is the ultimate goal like this:
{% if user.children_set.all.groups_set.count == 0 %}
<p>this table is empty</p>
{% else %}
<p>this table is not empty and go with the looping to print items etc<p>
{% endif %}
this may help
Models:
class House(Model)
class Flat(Model):
house = ForeignKey(House, related_name="houses")
owner = ForeignKey(User)
class User(Model)
queryset:
queryset = User.objects.prefetch_related(
Prefetch("flats", queryset=Flat.objects.select_related("houses"))
And then flats:
{% for flat in user.flats.all %}
<p>№ {{ flat.number }}, {{ flat.house.name }}</p>
{% endfor %}
It's fine. But for houses I need only unique ones
{% for flat in user.flats.all %}
<p>House {{ flat.house.name }}</p>
{% endfor %}
But this template gives me ALL houses, with duplicates.
How can I avoid duplicates, any ideas? I tried .distinct() but it's dosen't work, looks like I using distinct() wrong or etc.
It seems you may end up with duplicate houses if a user is the owner of multiple flats, which are all in the same house. To get all houses that the user is related to via Flats, you can use a different query, starting with House so that you can use distinct:
distinct_houses = House.objects.filter(flats__owner=user).distinct()
The above returns one House object for each flat where the user is an owner, and makes sure you don't have duplicates. (Note that the above assumes the related_name is changed to flats for house = ForeignKey(House, related_name="flats"), since "houses" as the related_name seems like a typo to relate back to the Flat model.)
Alternatively, you could do something in-memory in Python, if you still also need to know all Flats via your original queryset = User.objects.prefetch_related(...) and don't want an additional query. Like:
distinct_houses = {flat.house for flat in user.flats.all()}
Side note: it looks like you have a typo in needing to use Flat.objects.select_related('house') rather than Flat.objects.select_related('houses') based on the Foreign Key field name being house.
Only found solution with template filters.
Queryset:
queryset = User.objects.filter(status="ACTIVE").prefetch_related(
Prefetch("flats", queryset=Flat.objects.select_related("house"))
)
With this I can get all flats for each user:
{% for user in object_list %}
{% for flat in user.flats.all %}
{{ flat.number }}, {{ flat.house.name }}
{% endfor %}
{% endfor %}
And I am using template filter to get unique houses.
{% for user in object_list %}
{% for flat in user.flats.all|get_unique_houses %}
{{ flat.house.name }}
{% endfor %}
{% endfor %}
# extra_tags.py
#register.filter(name="get_unique_houses")
def get_unique_houses(value):
return value.distinct('house')
I have two very simple classes for products and photos. I would like to present products on the main page of my store along with photos related to a foreign key. But I do not know how to do this, I found many answers to get this in the view using a join like 'prefetch_related' but my ID changes for each case. So how do you present your photos for each product? are there any Django tags about which I do not know?
my models.py
class Product(models.Model)
name = models.CharField(max_length=10)
class Image(models.Model)
image = models.ImageField()
name_related = models.ForeignKay(Product, on_delate=models.CASCADE)
views.py
def home(request):
product_list = Product.objects.all()[:12]
#img = ??
context = {'product_list': product_list,
}
return render(request, 'home.html', context)
home.html
{% for product in product_list %}
{{ product.name }}
<!-- {{ product.imge }} ' element presenting the first photo for each 'product' model'???-->
{% endfor %}
Any help will be appreciated.
Since a foreign relation has been established you can iterate through the related models from the parent model.
The related models are already accessible from the parent model without doing anything explicit.
In your template you can do this:
{% for product in product_list %}
{{ product.name }}
{% for product_image in product.image.all %}
<!-- Iterate through this products related images -->
{{ product_image.image.url }}
{% endfor %}
{% endfor %}
For performance reasons, you will want to prefetch the relations, or else for every product you will do an additional query, so, in your view you will want to add this:
product_list = Product.objects.all().prefetch_related('image')[:12]
Just do
{% for product in product_list %}
{{ product.name }}
{% for image in product.image.all %}
<!-- {{ image.image.url }} -->?
{% endfor %}
{% endfor %}
I'm working on a Django web app and have the following query:
I have a model called 'AppQoSList' which lists the applications available to all users.
I have then another model called 'BasicAppSDWANProfiles' which has a ManyToMany relationship with 'AppQoSList' .
In short, it means a user can have multiple 'BasicAppSDWANProfiles' associated to his account and multiple AppQoS can be within a particular BasicAppSDWANProfiles:
class AppQoSList(models.Model):
app_qos_name = models.CharField(max_length=50, blank=None, null=True)
app_qos_description = models.CharField(max_length=500)
def __str__(self):
return u'%s' % self.app_qos_name
class BasicAppSDWANProfiles(models.Model):
profile_name = models.CharField(max_length=30)
profile_basic_app_qos = models.ManyToManyField(AppQoSList)
tenant_id = models.ForeignKey(Tenant, default=3)
I'm facing issue in my template when I try to display the list of apps available and the associated BasicAppSDWANProfile:
{% for app in apps %}
{% for profile_app in sdwan_prof %}
{% for specific_app in profile_app.profile_basic_app_qos.all %}
{% ifchanged specific_app.pk %}
{% if app.pk == specific_app.pk %}
<td><h4><span class="label label-primary">{{ profile_app.profile_name }}</span></h4></td>
{% else %}
<td><h4><span class="label label-warning">Not Assigned</span></h4></td>
{% endif %}
{% endifchanged %}
{% endfor %}
{% endfor %}
{% endfor %}
Issue with this code is that 'Not Assigned' is displayed 6 times on each row (which corresponds to the number of Apps found in BasicAppSDWANProfiles associated with this user) whereas I would like to display it only once:
Would you have any solution for this ?
Thanks in advance.
I was able to address this issue.
First I did clean up my view code to remove duplicate 'Not Assigned' values.
I pass to my template context a dictionary with only apps that have a profile assigned such as below:
{'citrix-static': 'DPS-BLACKLIST',
'exchange': 'DPS-BLACKLIST',
'ms-lync-audio': 'DPS-WHITELIST',
'ms-update': 'DPS-GREYLIST',
'rtp': 'DPS-WHITELIST',
'share-point': 'DPS-WHITELIST'}
In my template, I only loop through this dictionary:
{% for k,v in app_prof_assign.items %}
{% if app.app_qos_name == k %}
<td><h4><span class="label label-primary">{{ v }}</span></h4></td>
{% endif %}
{% endfor %}
I then simply check if the app is not in the profile dictionary, outside the loop:
{% if app.app_qos_name not in app_prof_assign %}
<td><h4><span class="label label-warning">Not Assigned</span></h4></td>
{% endif %}
Finally, I can get the table populated as expected:
I am trying to get access to the instances of a ModelChoiceField to render them the way I want in a template by displaying several fields of the instances.
class MyForm(forms.Form):
mychoices = forms.ModelChoiceField(
queryset=ObjectA.objects.all(), widget=forms.RadioSelect(), empty_label=None
)
This does not work:
{% for choice in form.mychoices %}
{{ choice.pk}}
{% endfor %}
I also tried to use the queryset but it does not render anything
{% for choice in form.mychoices.queryset %}
{{ choice.pk}}
{% endfor %}
Any idea?
Thanks
{% for choice in form.mychoices.field.queryset %}
{{ choice.pk }}
{% endfor %}
Notice the extra .field. It's a bit strange the first time you come across it, but it gives you what you want. You can also access the choices attribute of that object, instead of accessing queryset directly, but you'll need to access the first element of the choice to get the PK of the instance, like this:
{% for choice in form.mychoices.field.choices %}
{{ choice.0 }}
{% endfor %}