# django-crud-mixins

CRUD and form mixins for Django.
Useful for single-page-applications using Gridstack.

# Usage
Add to your `requirements.txt` file:
```
git+https://git.zm.is/XF/django-crud-mixins
```

## View helpers
The view helpers help create simple CRUD views for your application. They are geared towards a single-page application using Gridstack, but can be used on full pages as well by specifying a `type` of `page` always.

The view permission helpers add a `user=request.user` argument to all queryset filters, ensuring your views can only access the data of the requesting user. Additional filters can be set by overriding the `set_extra_args` method (detailed below).

Import the helpers from your view:
```
from mixins.views import ObjectCreate, ObjectDelete, ObjectList, ObjectRead, ObjectUpdate
```

Then, add the views:
```python
class AccountList(LoginRequiredMixin, OTPRequiredMixin, ObjectList):
    list_template = "partials/account-list.html"
    model = Account
    page_title = "List of accounts"

    list_url_name = "accounts"
    list_url_args = ["type"]

    submit_url_name = "account_create"


class AccountCreate(LoginRequiredMixin, OTPRequiredMixin, ObjectCreate):
    model = Account
    form_class = AccountForm

    submit_url_name = "account_create"


class AccountUpdate(LoginRequiredMixin, OTPRequiredMixin, ObjectUpdate):
    model = Account
    form_class = AccountForm

    submit_url_name = "account_update"


class AccountDelete(LoginRequiredMixin, OTPRequiredMixin, ObjectDelete):
    model = Account
```

### Variables
These variables can be added to the classes to adjust functionality:

Basic:
* `list_template`: the name of the template for the list view
* `model`: the model you want to view with this helper
* `page_title`: the page title to render
* `page_subtitle`: the page subtitle to render

List URLs:
* `list_url_name`: the name of the list URL to include in the context, passed as `list_url`
* `list_url_args`: arguments for the above, taken from view kwargs, or locals

Submit URLs:
* `submit_url_name`: the name of the submit URL to include in the context, passed as `submit_url` -- used in the form
* `submit_url_args`: arguments for the above, taken from view kwargs, or locals

For `ObjectList` only:
* `delete_all_url_name`: the name of the delete-all URL to include in the context, passed as `delete_all_url` -- used in the form's "Delete all" button
* `widget_options`: options for the Gristack widget

For `ObjectCreate` and `ObjectUpdate` only:
* `hide_cancel`: whether to hide the cancel button in the form

For `ObjectUpdate` only:
* `pk_required`: whether the primary key `pk` is required in the URL kwargs

### Methods
These methods can be added to the classes to adjust functionality:

For `ObjectCreate` and `ObjectUpdate` only:
* `post_save(self, obj)`: called after the object has been saved

For `ObjectCreate` only:
* `pre_save_mutate(self, user, obj)`: called before the object is saved, AbortSave can be raised with an error message to abort the save


These methods can be used on all classes, as they are inherited from the `RestrictedViewMixin`:
* `set_extra_args(self, user)`: adjusts the queryset filter with extra parameters, set `self.extra_permission_args` from this method to a dictionary of arguments

## Form permission helper
The form permission helper `RestrictedFormMixin` can be used as a mixin in your forms:
```python
class YourModelForm(RestrictedFormMixin, ModelForm):
    class Meta:
        model = YourModel
        fields = (
            "name",
        )
```
It's that simple!
The form will automatically add a `user=request.user` argument to all queryset filters, ensuring your forms can only access the data of the requesting user.