[ShryukGrandhi]

Why make this change?

Fixes #3849

When an entity defines more than one relationship to the same target entity (for example production_country and default_load_country, both pointing to country), the generated join for either relationship includes the foreign key predicates of all of them:

WHERE [table0].[production_country_id] = [table1].[id]
  AND [table0].[default_load_country_id] = [table1].[id]

So the nested object comes back null unless both FK values happen to be equal. This is the same bug reported earlier in #1718 and #2223.

What is this change?

AddJoinPredicatesForRelatedEntity looks up the foreign key definitions by (source entity, target entity), and that list contains the definitions of every relationship between the two entities. Each ForeignKeyDefinition already carries the RelationshipName it was created from, so the method now takes the relationship name (already available as fkLookupKey.RelationshipName in AddJoinPredicatesForRelationship) and skips definitions that belong to a different relationship of the same source entity.

Definitions that come from the target entity's side of the relationship (the fallback lookup) have a different SourceEntityName and are unaffected, as are self-joins, which already use the per-relationship RelationshipToFkDefinition lookup. This covers both nested selection and nested filters, since both go through AddJoinPredicatesForRelationship.

How was this tested?

• Integration Tests
• Unit Tests

Added AddJoinPredicatesForRelationship_MultipleRelationshipsToSameTarget_UsesOnlyRequestedRelationship to BaseSqlQueryStructureHelperTests. It sets up a Book entity with two relationships (author, editor) to Author and checks that each one produces a single join predicate on its own source column. Before the fix both cases failed (2 predicates instead of 1). After the fix the whole test class passes (23/23).

I couldn't run the database integration suites locally.

Sample Request(s)

With the config from the issue:

{ product_grades { items { name production_country_id production_country { id name } } } }

now returns production_country for rows where production_country_id and default_load_country_id differ.

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[Copilot]

🟡 Changes recommended

Regression coverage is missing for the linking-object scenario, including verification that relationship filtering preserves the requested foreign keys, linking-table join, and parent-correlation predicate while excluding the other relationship.

1 open issue

• Test foreign-key filtering with different linking objects · New

What changed in this PR

Fixes relationship join generation for #3849 by selecting only the requested relationship’s foreign keys when multiple relationships target the same entity.

Changes:

• Passes the relationship name into related-entity join generation and filters out other source-side relationships.
• Adds parameterized regression tests verifying that author and editor relationships each use their own foreign key.

File	Description
src/​Service.Tests/​UnitTests/​BaseSqlQueryStructureHelperTests.cs	Adds regression coverage and updates the existing helper call.
src/​Core/​Resolvers/​Sql Query Structures/​BaseSqlQueryStructure.cs	Filters join foreign keys by the requested relationship name.

_{Review effort: Balanced}