django-find 0.1

Easily add complex search functionality to Django projects

# django-find

## Summary

**django-find** is a Django app that makes it easy to add complex
search functionality to your project. It supports two different ways
to search your Django models: Query-based, or JSON-based.

### Query-based search

By query-based, we mean that you can use statements like these
to search your model:

- `hello world` (searches all fields for hello and world)
- `author:robert OR title:road` (searches the field "author" for "robert", and "title" for "road")
- `author:"robert frost" and (title:road or chapter:2)`
- `^robert` (find anything that starts with "robert")
- `robert$` (find anything that ends with "robert")
- `^robert$ and not title:road` (find anything that equals "robert" and not the title "road")

In other words, you can write anything from super-simple text based
searches, to complex boolean logic.

### JSON-based search

To make it easy to do complex searches spanning multiple models, a
JSON-based search functionality is provided:

```
{
"Author":{"name":[[["equals","test"]]]},
"Book": {"title":[[["notcontains","c"]]]},
"Chapter": {"content":[[["startswith","The "]]]}
}
```

django-find is smart in figuring out how to join those models
together and return a useful search results.

## Example

Enabling the functionality is as simple as the following:

1. Make sure your model inherits the `Searchable` mixin. A word of
caution: Inherit from models.Model first, then Searchable.
2. Add a "find" attribute to your models, that lists the
aliases and maps them to a Django field using Django's selector
syntax (underscore-separated field names).

Example:

```python
from django.db import models
from django_find import Searchable

class Author(models.Model, Searchable):
name = models.CharField("Author Name", max_length=10)

find = [
('author', 'name'),
('name', 'name'),
]

class Book(models.Model, Searchable):
author = models.ForeignKey(Author, on_delete=models.CASCADE)
title = models.CharField("Title", max_length=10)
rating = models.IntegerField()

find = [
('author', 'author__name'), # Note the selector syntax
('title', 'title'),
('rating', 'rating'),
]
```

That is all, your models now provide the following methods:

```python
# Query-based search returns a standard Django QuerySet that you
# can .filter() and work with as usual.
query = Book.by_query('author:"robert frost" and title:"the road"')

# You can also get a Django Q object for the statements.
q_obj = Book.q_from_query('author:"robert frost" and title:"the road"')

# JSON-based search exhausts what Django's ORM can do, so it does
# not return a Django QuerySet, but a row-based PaginatedRawQuerySet:
query, field_list = Book.by_json_raw('''{
"Chapter": {"title":[[["contains","foo"]]]}
}''')
print('|'.join(field_list))
for row in query:
print('|'.join(row))
```

You can pass the PaginatedRawQuerySet to Django templates as you
would with a Django QuerySet, as it supports slicing and
pagination.

## Quick start

1. Add "django\_find" to your `INSTALLED_APPS` setting like this::

```python
INSTALLED_APPS = [
...
'django_find',
]
```

2. Include the django\_find URLconf in your project urls.py like this::

```python
path('django_find/', include('django_find.urls')),
```

3. Run `python manage.py migrate` to create the django\_find models.