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49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
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=====================
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Model index reference
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=====================
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.. module:: django.db.models.indexes
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.. currentmodule:: django.db.models
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.. versionadded:: 1.11
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Index classes ease creating database indexes. This document explains the API
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references of :class:`Index` which includes the `index options`_.
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.. admonition:: Referencing built-in indexes
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Indexes are defined in ``django.db.models.indexes``, but for convenience
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they're imported into :mod:`django.db.models`. The standard convention is
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to use ``from django.db import models`` and refer to the indexes as
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``models.<IndexClass>``.
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``Index`` options
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=================
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.. class:: Index(fields=[], name=None)
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Creates an index (B-Tree) in the database.
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``fields``
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-----------
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.. attribute:: Index.fields
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A list of the name of the fields on which the index is desired.
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``name``
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--------
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.. attribute:: Index.name
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The name of the index. If ``name`` isn't provided Django will auto-generate a
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name. For compatibility with different databases, index names cannot be longer
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than 30 characters and shouldn't start with a number (0-9) or underscore (_).
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.. seealso::
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Use the :class:`~django.db.migrations.operations.AddIndex` and
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:class:`~django.db.migrations.operations.RemoveIndex` operations to add
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and remove indexes.
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