Trigram similarity
The trigram_similar
lookup allows you to perform trigram lookups, measuring the number of trigrams (three consecutive characters) shared, using a dedicated PostgreSQL extension. A trigram lookup is given an expression and returns results that have a similarity measurement greater than the current similarity threshold.
To use it, add 'django.contrib.postgres'
in your INSTALLED_APPS
and activate the pg_trgm extension on PostgreSQL. You can install the extension using the TrigramExtension
migration operation.
The trigram_similar
lookup can be used on CharField
and TextField
:
>>> City.objects.filter(name__trigram_similar="Middlesborough") ['<City: Middlesbrough>']
Unaccent
The unaccent
lookup allows you to perform accent-insensitive lookups using a dedicated PostgreSQL extension.
This lookup is implemented using Transform
, so it can be chained with other lookup functions. To use it, you need to add 'django.contrib.postgres'
in your INSTALLED_APPS
and activate the unaccent extension on PostgreSQL. The UnaccentExtension
migration operation is available if you want to perform this activation using migrations).
The unaccent
lookup can be used on CharField
and TextField
:
>>> City.objects.filter(name__unaccent="México") ['<City: Mexico>'] >>> User.objects.filter(first_name__unaccent__startswith="Jerem") ['<User: Jeremy>', '<User: Jérémy>', '<User: Jérémie>', '<User: Jeremie>']
Warning
unaccent
lookups should perform fine in most use cases. However, queries using this filter will generally perform full table scans, which can be slow on large tables. In those cases, using dedicated full text indexing tools might be appropriate.
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