## Summary
Postgres columns can be
- [generated as
identity](https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-identity-column/)
- [generated by a custom
expression](https://www.postgresql.org/docs/current/ddl-generated-columns.html)
In these 2 cases, the column is not required when inserting a new row.
This PR makes sure these types of column are not marked required in n8n.
### How to test
1. Create a Postgres table with all types of generated columns:
for version >= 10
```sql
CREATE TABLE "public"."test_table" (
"id" int8 NOT NULL DEFAULT nextval('test_table_id_seq'::regclass),
"identity_id" bigint GENERATED ALWAYS AS IDENTITY,
"id_plus" numeric GENERATED ALWAYS AS (id + 5) STORED,
"title" varchar NOT NULL,
"created_at" timestamp DEFAULT now(),
PRIMARY KEY ("id")
)
```
Before 10 you have to use serial or bigserial types:
```sql
CREATE TABLE distributors (
did serial not null primary key,
name varchar(40) NOT NULL CHECK (name <> '')
);
```
2. Add a postgres node to canvas and try to insert data without the
generated columns
3. Should successfully insert
More info in Linear/Github issue ⬇️
## Related tickets and issues
- fixes#7084
-
https://linear.app/n8n/issue/NODE-816/rmc-not-all-id-fields-should-be-required
-
https://linear.app/n8n/issue/NODE-681/postgres-cant-map-automatically-if-database-requires-a-field
## Review / Merge checklist
- [ ] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [ ] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [ ] Tests included.
> A bug is not considered fixed, unless a test is added to prevent it
from happening again.
> A feature is not complete without tests.
---------
Co-authored-by: Michael Kret <michael.k@radency.com>
bed04ec122
