# django-filtered-form

## Installation

In your virtualenv, use pip install django-filteredform.

You don't need to install it into your settings.INSTALLED_APPS, as it does not provide any models or templates, only forms.

## Usage

Declarative way to define filters on fields on a django model form:

from django import forms
from people.models import Person
from filtered_form.forms import FilteringForm

class Meta:
model = Person

instance_filters = {
'units': 'company.units'
}
filters = {
'units': models.Q(is_active=True),
'colours__in': ['red','blue','green']
}


### instance_filters

instance_filters are things that allow for relational filters to be applied.

For instance, if you have a triple of models, Person, Unit and Company, and every person and unit have a foreign key to a company, you can use an instance filter to easily select only the associated company's units for a queryset when viewing a person.

Alternatively, you can supply a queryset method (that does not require arguments), for more filtering:

instance_filters = {
'units': 'company.units.active'
}


### plain filters

A more conventional filter structure, that allows you to supply a Q object, or a dict of key-value pairs, which will be passed to .filter() on the queryset.

You can quite easily shoot yourself in the foot if your filter keys are not valid arguments for a filter function on that queryset.

### FormSets

You can either create a form using this method, and then pass that to your formset class or factory. Or, you can have a formset class based on filtered_form.forms.FilteredFormSet, which will also set up the queryset values on the empty form correctly, which is very useful if you are using dynamic forms.

## Version History

### 1.0.1

Improve documentation.

Allow for a callable in the value of an instance_filter.

Allow for a dict in the value of a filter.

Initial Release.