Can't create foreignKey with Declarative Schema on table not created through DS

[peterjaap]

Preconditions (*)

1. Magento 2.3.0

Steps to reproduce (*)

1. Create a module that uses Declarative Schema by creating a db_schema.xml
2. Try to create a foreignKey with as referenceTable a table that isn't created/controlled through Declarative Schema (in my case a 3rd party extension's table)
3. Run php bin/magento setup:upgrade

Expected result (*)

1. Table is created with a foreign key to referenced table

Actual result (*)

1. Error Notice: Undefined index: referenced_table_name_here in vendor/magento/framework/Setup/Declaration/Schema/Declaration/SchemaBuilder.php on line 352

When I edit vendor/magento/framework/Setup/Declaration/Schema/SchemaConfig.php:77 and add print_r(array_keys($data['table']));exit; there, I get a list of all tables created by extensions that use Declarative Schema. The referenced table isn't one of them and thus setup:upgrade throws an error.

[magento-engcom-team]

Hi @peterjaap. Thank you for your report.
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@peterjaap do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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Hi @peterjaap thank you for you report, It will be processed faster if you move this to https://github.com/magento/community-features

[peterjaap]

@engcom-backlog-nazar but it's not a feature? It's a bug!

@peterjaap according to devdocs, seems like no.

@peterjaap In the following example, the selected constraint node defines the characteristics of the FL_ALLOWED_SEVERITIES foreign key. https://magento-devdocs.github.io/devdocs-for-tests/guides/v2.3/extension-dev-guide/declarative-schema/db-schema.html

[peterjaap]

@engcom-backlog-nazar could you elaborate on that?

@peterjaap this mean that you can create a foreign key only with tables created by declarative schema, because all table data loaded now with checking db_schema.xml