# Dokumentasi Django 6.0.7

# Pencarian khusus PostgreSQL

## Kemiripan trigram

### `trigram_similar`

Pencarian `trigram_similar` mengizinkan anda melakukan pencarian triagram, mengukur angka dari triagram (tiga karakter berurutan) dibagi, menggunakan tambahan PostgreSQL keseluruhan. Sebuah pencarian triagram diberikan sebuah pernyataan dan mengembalikan hasil bahwa mempunyai pengukuran kemiripan lebih besar dari ambang kemiripan saat ini.

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")
    <QuerySet [<City: Middlesbrough>]>

### `trigram_word_similar`

The `trigram_word_similar` lookup allows you to perform trigram word similarity lookups using a dedicated PostgreSQL extension. It can be approximately understood as measuring the greatest number of trigrams shared between the parameter and any substring of the field. A trigram word lookup is given an expression and returns results that have a word 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_word_similar` lookup can be used on `CharField` and `TextField`:

    >>> Sentence.objects.filter(name__trigram_word_similar="Middlesborough")
    <QuerySet [<Sentence: Gumby rides on the path of Middlesbrough>]>

### `trigram_strict_word_similar`

Similar to `trigram_word_similar`, except that it forces extent boundaries to match word boundaries.

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_strict_word_similar` lookup can be used on `CharField` and `TextField`.

## `Unaccent`

Pencarian `unaccent` mengizinkan anda melakukan pencarian aksen-peka menggunakan tambahan PostgreSQL khusus.

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")
    <QuerySet [<City: Mexico>]>

    >>> User.objects.filter(first_name__unaccent__startswith="Jerem")
    <QuerySet [<User: Jeremy>, <User: Jérémy>, <User: Jérémie>, <User: Jeremie>]>

Peringatan

Pencarian `unaccent` harus tampil baik dalam kebanyakan pengunaan kasus. Bagaimanapun, permintaan menggunakan penyaring ini akan umumnya melakukan pemindaian tabel penuh, yang dapat melambatkan pada tabel-tabel besar. Dalam kasus-kasus tersebut, menggunakan alat-alat pengindeksan teks penuh yang berdedikasi mungkin sesuai.