#29722: Improve introspection for special table and view types in PostgreSQL
-------------------------------------+-------------------------------------
Reporter: Nick Pope | Owner: nobody
Type: New | Status: new
feature |
Component: Database | Version: master
layer (models, ORM) | Keywords: postgresql,
Severity: Normal | introspection, inspectdb, views,
Triage Stage: | partitions
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Looking at the documentation for
[https://www.postgresql.org/docs/10/static/catalog-pg-class.html pg_class]
there are the following types that we might be interested in introspecting
for generation of models:
- `r` — ordinary table — obviously this is already supported.
- `v` — views — support was implemented in #29004.
- `f` — foreign table — being addressed by #29719.
- `m` — materialized views — could be handled much like #29004, mapping
`m` to `v`.
- `p` — partitioned table — could be handled mapping `p` to `t`, but gets
more complicated, read on below...
For partitioned tables, we are unlikely to want to generate models for all
of the individual partitions, although this could be supported with an
`--include-partitions` flag.
From [https://paquier.xyz/postgresql-2/partition-information/ this link]
we can see an example of output for partitioned tables:
{{{
relid | relname | relsize | relispartition | relkind
-------+--------------------+---------+----------------+---------
16410 | population | 0 | f | p
16417 | population_s | 8192 | t | r
16424 | population_t | 0 | t | p
16431 | population_t_10_20 | 8192 | t | r
16445 | population_t_20_30 | 8192 | t | r
}}}
On PostgreSQL 10+ we need to filter on `NOT relispartition` to ignore all
of the partitions and only include the parent (which is the table that is
usually interacted with).
--
Ticket URL: <https://code.djangoproject.com/ticket/29722>
Django <https://code.djangoproject.com/>
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