djangoql 0.3.0

DjangoQL: query mini-language that translates to Django ORM

Query mini-language that translates into Django ORM. Supports logical operators, parenthesis, table joins, works with any Django models. Tested vs. Python 2.7, 3.5 and 3.6, Django 1.8, 1.9, 1.10.

Installation

$ pip install djangoql

Add 'djangoql' to INSTALLED_APPS in your settings.py:

INSTALLED_APPS = [
    ...
    'djangoql',
    ...
]

Add it to your Django admin

Add DjangoQLSearchMixin to your model admin, and it will replace standard Django search functionality with DjangoQL search. Example:

from django.contrib import admin

from djangoql.admin import DjangoQLSearchMixin

from .models import Book


@admin.register(Book)
class BookAdmin(DjangoQLSearchMixin, admin.ModelAdmin):
    pass

Can I use it outside of Django admin?

Sure. You can add DjangoQL search functionality to any Django model using DjangoQLQuerySet:

from django.db import models

from djangoql.queryset import DjangoQLQuerySet


class Book(models.Model):
    name = models.CharField(max_length=255)
    author = models.ForeignKey('auth.User')

    objects = DjangoQLQuerySet.as_manager()

With the example above you can perform search like this:

qs = Book.objects.djangoql(
    'name ~ "war" and author.last_name = "Tolstoy"'
)

It returns a normal queryset, so you can extend it and reuse if necessary. The following code works fine:

print(qs.count())

Alternatively you can add DjangoQL search to any existing queryset, even if it’s not an instance of DjangoQLQuerySet:

from django.contrib.auth.models import User

from djangoql.queryset import apply_search

qs = User.objects.all()
qs = apply_search(qs, 'groups = None')
print(qs.exists())

Language reference

DjangoQL looks close to Python syntax, however there’re some minor differences. Basically you just reference model fields like you do it in Python code, apply comparison and logical operators and parenthesis. DjangoQL is case-sensitive.

• model fields: exactly as they are defined in Python code. Access nested properties via ., for example author.last_name;

• strings must be double-quoted. Single quotes are not supported. To escape a double quote use \";

• boolean and null values: True, False, None. Please note that they can be combined with equality operators only, so you can write published = False or date_published = None, but published > False will cause an error;

• logical operators: and, or;

• comparison operators: =, !=, <, <=, >, >= - work as you expect. ~ and !~ - test that a string contains or not contains a substring (translated into __icontains);

• test a value vs. list: in, not in. Example: pk in (2, 3).

License

MIT