django-computed-property

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django-computed-property

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Computed Property Fields for Django

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# django-computed-property
Computed Property Fields for Django

Inspired by [Google Cloud Datastore NDB Computed Properties](https://cloud.google.com/appengine/docs/standard/python/ndb/entity-property-reference#computed).

Automatically store a computed value in the database when saving your model so you can filter
on values requiring complex (or simple!) calculations.

## Quick start

1. Install this library

```
    pip install django-computed-property
    ```
    
1. Add to `INSTALLED_APPS`
    
    ```python
    INSTALLED_APPS = [
        ...,
        'computed_property'
    ]
    ```

1. Add a computed field to your model(s)

```python
    from django.db import models
    import computed_property
 
    class MyModel(models.Model):
        doubled = computed_property.ComputedIntegerField(compute_from='double_it')
        base = models.IntegerField()
     
        def double_it(self):
            return self.base * 2
    ```

Documentation available at http://django-computed-property.readthedocs.io/en/latest/

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