[Bug] this.serializers does not get updated when adding new array types

[fgodino-milu]

Hi all, we've run into an issue when trying to insert arrays of enums into the database because of how array serializers work.

Context
We use typeorm pglite driver to run tests. The PGLite instance gets initiated, we run the db migrations, and then we execute tests.

Reproduction

1. PGLite instantiates the array serializers using _initArrayTypes
2. User executes a query like this

CREATE TYPE mood AS ENUM ('sad', 'happy');
CREATE TABLE IF NOT EXISTS test (
    id SERIAL PRIMARY KEY,
    moods mood[]
);

3. User tries to insert a new record

await db.query(`INSERT INTO test (moods) VALUES ($1);`,[['sad', 'happy']],)

4. Because the new array type doesn't exist in this.serializers[type.typarray], the query fails to parse the input array into a valid syntax.

Solution

I see two possible solutions:

1. Add the ability to reprocess the array serializers
2. Check if there are any new array types to add to the serializer whenever there is a new CREATE type of query.

I'd appreciate any help, I am happy to submit a PR to address the issue.

Thanks!