Pivot fields missing for uni-directional relation

[Erik Gaal]

Describe the bug
When a relation is only specified in one direction on the ModelSchema, then the pivot fields are on the wrong side of the relation. For example, when there is a relationship users belongs to many roles, there is a rolesPivot on the User type. While there should only be a usersPivot on the Roles type, because there is no way to retrieve the users from the roles.

To Reproduce

// UserSchema.php
public function relations(): array
{
    return [
        'roles' => Field::collection(RoleSchema::class),
    ];
}

// RoleSchema.php
public function relations(): array
{
    return [];
}

// UserRole.php
public function fields(): array
{
    return [
        'comment' => Field::string(),
    ];
}

{
  user(id: 1) {
    roles {
      userPivot { comment }
    }
  }
}

# "{"errors":[{"message":"Cannot query field \"userPivot\" on type \"Role\".","category":"graphql","locations":[{"line":3,"column":17}]}]}"

• Laravel Version: v5.7.27
• Bakery Version v3.0.0