I have a subclass of Wagtail Page class that has field of django ManyToManyField type. When I try to create a new instance of my page object, I get a list of objects that the the ManyToManyField points to and I am able select multiple items. However, after creating that page when I try to edit the same page, it seems no data got saved for the ManyToMany field. I know in Django ModelAdmin one have to override the save_related() to save ManyToMany field data. Is there a similar method for the Wagtail Page model?
You should define the field as a ParentalManyToManyField relation, as per the example here: http://docs.wagtail.io/en/v1.13.1/getting_started/tutorial.html#categories
This is a variant of ManyToManyField which is able to keep track of the relation in memory, allowing it to work in situations such as previewing and saving as draft (where it doesn't get saved to the normal database records).
I was able to use the 'after_edit_page' and 'after_create_page' hooks to save the data for the page's ManyToMany fields.
Related
I am currently using Shopizer as a sort of headless CMS, leveraging its out of the box admin pages and REST API for the content. There is a page for editing products in the admin system but I would like to add and/or remove specific fields. Making changes to the base code seems to be the most obvious solution but it is taking me a significant amount of time to implement it successfully.
Is there some sort of a config file or an initialization process to customize the fields for creating categories and products using Shopizer's admin page? What is the best practice for this scenario if the former approach is not possible?
If you need to add fields the easiest way is to add them in model objects
com.salesmanager.core.model.*
Example of an annotated field
#Column (name ="IP_ADDRESS")
private String ipAddress;
Once you restart your instance the new field will be available.
I'm using sonata admin in my project I have two entities, Order and Delivery which are related in a oneToMany relationship. Each of these has a oneToMany relationship with OrderItem and DeliveryItem respectively.
I would like to make it easier when creating a Delivery by loading corresponding Order Items by pre-populating the items delivered through an ajax call based on Order item selected.
I extended the edit theme and can make the ajax call which populates fine, however when trying to save, I get the error in relation to my form having extra fields even though I've followed sonata admin's naming convention to the letter.
Is there a way to do this?
when calling formMapper->add() you can pass the 'allow_extra_fields' => true option.
http://symfony.com/doc/current/reference/forms/types/form.html#allow-extra-fields
I have a single page application with AngularJs and Django. On my main page, I get all the forms needed when loading the page. BUT, some fields are dynamically updated.
Let's say I have
class Model1(models.Model):
pass
class Model2(models.Model):
model_1 = models.ForeignKey(Model1)
forms:
class Model2Form(forms.ModelForm):
class Meta:
model = Model2
fields = ('model_1', )
My SPA allows me to create instances of Model1 (without reloading the page). I know how to filter the options shown and dynamically add the new instances in the select field BUT, doing so, when the html is first rendered, before angular magic takes place and filter the available options, I get the queryset made by django which is by default model.objects.all(). All right, I'd like to display none of that. I tried to add in the init of my function:
self.fields['model_1'].queryset = Model1.objects.none()
and indeed no option is displayed in the select field when the form is first rendered but then, I can't validate my form, I get the error: Select a valid choice. That choice is not one of the available choices. (obviously, it had no option available due to the queryset.none() )
I'd really like not to load forms when called but doing it when my page first load. Is there any option to help me do so?
Cheers guyz,
Keep rocking
You need to specify that the model_1 field of Model2 can be null, as specified here:
Allow null in foreign key to user. Django
model_1 = models.ForeignKey(Model1, null=True, blank=True, default = None)
I find out how to handle that problem. It is quite stupid, I did not give you all the parameters of the problem.
The forms are rendered on load but when I validate it, it goes through a CRUD operation and an OTHER form is initialized at this point which will handle the data I'm sending. So I can override the queryset in the init of that (second) form based on some extra kwargs to differentiate between the form I'm using for the first rendering and the form to handle my data.
No need to make any field nullable or add extra validation.
Hope I'm clear enough. Cheers
In a Salesforce Junction object can I reference fields from the two Master-Detail relationships in formulas and/or the User Interface or am I going to have to switch to Apex code? I can write the apex, but I try to use the built in tools as much as possible :).
To use the examples from the Trailhead tutorials I have
1. A Job Position Object (Project Mananger, Sr Developer, etc).
2. A Posting Website Object (Monster.com, Dice.com, etc).
3. A "Job Posting" Junction Object to link the two.
Let's say I add a field to the Job Position Object called "Close Date" to keep track of the date the position closes. Can I display this field on the layout page of the Job Posting Junction object without using Apex code and/or a custom VisualForce page?
Thanks!
You can definitely do that. You can use a formula field and just reference the relationship name of the object and the field name (so for example something like Job_Position__r.Close_Date__c), or if you prefer you can use the "Insert Field" button when creating the formula which will allow you to select the object/field you want through the UI.
I have a page where it displays a filtered model instance list and allows users to update some fields of it or add new fields as a form.
I am curious what wpuld be a clever way of doing this, to delete and resave all the input data or make comparison for each data and save edited / new fields& entities.
I would like to mind you that I use postgres for saving these values and I display around 20 entries for this form.
The QuerySet object has the update() method - it's used in ie. Admin Panel for bulk updating multiple selected objects from change lists. Here is the method reference at django's official documentation.
How to use it:
Just create queryset with the models you want to update (assumng that MyModel has field named 'my_field'):
qs = MyModel.objects.all()
qs.update(my_field=value)
That's it - remember that update() method will not send any signals like the save() method - it will just run query directly to database.
As for 'adding fields via form' - I don't know if I got it right? You want to add additional related models or dynamically add fields to the model table on database?
If you want to add related models then use InlineFormset (http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#inline-form) - it's quite easy to handle.
Otherwise you have to add fields to models' _meta as described here: How dynamic add custom field to model.