#35539: SearchVector GinIndex raises IMMUTABLE error
----------------------------------+------------------------------------
Reporter: Alastair D'Silva | Owner: (none)
Type: Bug | Status: closed
Component: contrib.postgres | Version: 5.0
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Charette):
You don't need this patch at all of the `save()` shenanigans. All you are
doing here is circumventing the fact that must specify a language
configuration for `ts_vector` to be immutable by running the
`update(search_vector=self.search_vector)` that will use the session
configured `default_text_search_config`.
You can simply do
{{{#!python
class Document(models.Model):
title = models.CharField(max_length=255)
metadata = models.JSONField(null=True)
class Meta:
indexes = [
GinIndex(
SearchVector('title', Coalesce('metadata', Value('')),
config='english'),
name='document_search',
),
]
}}}
Or use a `GeneratedField` if you want to materialize the search vector
{{{#!python
class Document(models.Model):
title = models.CharField(max_length=255)
metadata = models.JSONField(null=True)
search_vector = GeneratedField(
SearchVector('title', Coalesce('metadata', Value('')),
config='english')
output_field=SearchVectorField()
)
class Meta:
indexes = [
GinIndex(
'search_vector', name='search_vector_idx'
),
]
}}}
The key part here is that **a `config` must be specified if you want to
use `SearchVector` in an index or generated field to make it `IMMUTABLE`**
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Ticket URL: <https://code.djangoproject.com/ticket/35539#comment:5>
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