Laravel 5.3 Eloquent transactions and foreign key restrictions - postgresql

Question

Am working on bigger project where we have multiple schemas in one Postgres DB. We have created foreign keys between schemas. Here is an example >
We have company schema and user schema. Company schema has company_users table which have foreign key restriction on user.users table
CREATE TABLE company.company_user
(
id serial NOT NULL,
company_id integer NOT NULL,
user_id integer NOT NULL,
created_at timestamp(0) without time zone,
updated_at timestamp(0) without time zone,
deleted_at timestamp(0) without time zone,
CONSTRAINT company_user_pkey PRIMARY KEY (id),
CONSTRAINT company_user_company_id_foreign FOREIGN KEY (company_id)
REFERENCES company.companies (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT company_user_user_id_foreign FOREIGN KEY (user_id)
REFERENCES "user".users (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
Following queries run in Postgres without issue
BEGIN;
insert into "db"."user"."users" (id,"surname", "firstname", "email", "position", "language_id", "is_super_admin", "updated_at", "created_at") values (156,'Mueller', 'Julianne', 'julianne.mueller1#example.org', 'Nuclear Power Reactor Operator', 41, false, '2017-01-13 12:35:10', '2017-01-13 12:35:10') returning "id";
insert into "db"."company"."company_user" ("company_id", "user_id", "updated_at", "created_at") values (4445, 156, '2017-01-13 12:35:10', '2017-01-13 12:35:10') returning "id";
COMMIT;
However if i perform same queries via Eloquent in Laravel
\DB::beginTransaction();
$user = new User(["surname" => 'Mueller',
"firstname" => 'Julianne',
"email" => 'julianne.mueller1#example.org',
"position" => 'Nuclear Power Reactor Operator',
"language_id" => 41,
"is_super_admin" => false]
);
if (!$user->save()) {
\DB::rollBack();
return false;
}
\Log::error($user->id);
$company_user = new CompanyUser([
"company_id" => 4445,
"user_id" => $user->id
]);
if (!$company_user->save()) {
\DB::rollBack();
return false;
}
\DB::commit();
is throwing folloing error (it seems that it cannot find id of user in the table)
PDOException: SQLSTATE[23503]: Foreign key violation: 7 ERROR: insert or update on table "company_user" violates foreign key constraint "company_user_user_id_foreign"
Would anyone can say why this is not working? \Log::error($user->id) is printing id of inserted user. I tried to print out queries from Laravel with DB listener, all queries are executed in correct order, but am still getting this error.

Answer 1

Ok so we found a solution. It seems that we need to start transaction for each of schemas separately + each foreign key that are referencing different schema than their own should be created as deferred.

Answer 2

Make sure CompanyUser has $fillable:
$fillable = ['user_id', 'company_id'];
Also, make sure there is a user with this ID is already in users table. Maybe you'll need to get rid of transaction.