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توضیحات

Django application with some addons regarding PostgreSQL trigram text comparison

ویژگی	مقدار
سیستم عامل	-
نام فایل	djorm-ext-pgtrgm-0.3
نام	djorm-ext-pgtrgm
نسخه کتابخانه	0.3
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	José Antonio Leiva
ایمیل نویسنده	jleivaizq@gmail.com
آدرس صفحه اصلی	https://github.com/jleivaizq/djorm-ext-pgtrgm
آدرس اینترنتی	https://pypi.org/project/djorm-ext-pgtrgm/
مجوز	LGPL 3

djorm-ext-pgtrgm ================ Django pgtrgm is a Django application with some addons regarding PostgreSQL trigram (or trigraph) text comparison A trigram is a group of three consecutive characters taken from a string. We can measure the similarity of two strings by counting the number of trigrams they share. This simple idea turns out to be very effective for measuring the similarity of words in many natural languages. For example, the set of trigrams in the string "cat" is " c", " ca", "cat", and "at ". With this extension, we could use this feature inside Django ORM with a simple QuerySet filter keyword It is distributed under the terms of the [GNU Lesser General Public License](http://www.gnu.org/licenses/lgpl.html) PostgreSQL syntax ----------------- `text % text` -> boolean Returns true if its arguments have a similarity that is greater than the current similarity threshold set by set_limit. [How to install and use pg_trgm extension in PostgreSQL 9.2](http://www.postgresql.org/docs/9.2/static/pgtrgm.html) Requeriments ------------ - Django 1.5 (or higher). It's possible that works with other versions lower 1.5 - Postgres `pg_trgm` extension. In debian/ubuntu: `sudo apt-get install postgres-contrib` Installation ------------ - In your `settings.py` ```python INSTALLED_APPS = ( 'djorm_pgtrgm', ) ``` - You need to *register* the extension in your database. Run `./manage.py dbshell` and then execute: ```sql CREATE EXTENSION pg_trgm; ``` - Optionally, you can create an index over a text column for the purpose of very fast similarity searches. For example, supose you will filter a lot over the field `description` of the model `myapp.Product`: ```sql CREATE INDEX desctiption_trgm_idx ON myapp_product USING gist (description gist_trgm_ops); ``` Usage ----------- Adds a new query set filter keyword to allow text searching. ```python MyModel.objects.filter(field_name__similar='whatever') ``` To ensure results ordered by similarity, you could do this: ```python MyModel.objects.filter(field_name__similar='whatever'). extra(select={'distance': "similarity(name, 'whatever')"}). order_by('-distance')) ``` In a sake of brevity, you could use a provided `SimilarManager` that has a `filter_o` method. ```python from djorm_pgtrgm import SimilarManager class MyModel(models.Model): objects = SimilarManager() # your fields ... ``` `filter_o` is a shortcut for the `filter + extra + order_by` in the snippet above. ```python MyModel.objects.filter_o(field_name__similar='whatever') ``` So, this will return every similar `MyModel` instance with a `field_name` *similar* to `'whatever'` and sorted by the distance ot each intance's `field_name` value to target `'whatever'`. In addition, an extra field `field_name_distance` is added to each item in the queryset. Development ----------- You can get the last version of djorm-ext-pgtrgm by doing a clone of its repository: git clone git://github.com/jleivaizq/djorm-ext-pgtrgm.git 0.0.1 (2013-10-23) =================== * First version to djorm-ext-pgtrgm

نحوه نصب

نصب پکیج whl djorm-ext-pgtrgm-0.3:

pip install djorm-ext-pgtrgm-0.3.whl

نصب پکیج tar.gz djorm-ext-pgtrgm-0.3:

pip install djorm-ext-pgtrgm-0.3.tar.gz