The logic about manytomany relationship

[medoer]

Overview of the issue

In a JHipster-generated application, there is an inconsistency in handling many-to-many relationships:

• The owner entity's edit page correctly retrieves and updates associated data.
• The other entity's edit page does not return associated records and does not allow modifications.

JHipster JDL Configuration

JDL Definitions

      entity Product {
        name String required,
        price BigDecimal required
      }
  entity Category {
    name String required
  }
  
  relationship ManyToMany {
    Product{categories} to Category{products}
  }
  
  paginate Product with pagination
  filter Product
  
  paginate Category with pagination
  filter Category

  

-->

• JDL is mandatory for bug reports. This will allow us to use automated tests and generate the broken sample using the jhipster from-issue command.

Motivation for or Use Case

This issue prevents proper handling of many-to-many relationships in the generated UI, leading to incomplete data retrieval and modification restrictions.

Reproduce the Error

1. Generate a JHipster application with a many-to-many relationship.
2. Go to the edit page of the owner entity and verify that associated data is retrieved correctly.
3. Go to the edit page of the other entity and observe that no related data is fetched or editable.

Related Issues

Suggest a Fix

JHipster Version(s)

8.9.0

Browsers and Operating System

• Tickets opened without reproduction steps or that do not follow the template recommendation will be closed.
• Checking this box is mandatory (this is just to show you read everything).

[mshima]

Please provide a full jdl with application in the issue description.

[medoer]

Just a example, this is all
`entity Category {
name String required
}

relationship ManyToMany {
Product{categories} to Category{products}
}

paginate Product with pagination
filter Product

paginate Category with pagination
filter Category`

The yo-rc.json

{ "generator-jhipster": { "applicationType": "monolith", "authenticationType": "jwt", "baseName": "y", "buildTool": "maven", "cacheProvider": "no", "clientFramework": "react", "clientTestFrameworks": [], "clientTheme": "litera", "clientThemeVariant": "primary", "creationTimestamp": 1742870855728, "databaseType": "sql", "devDatabaseType": "h2Memory", "enableHibernateCache": null, "enableTranslation": true, "entities": ["Product", "Category"], "feignClient": null, "jhipsterVersion": "8.9.0", "jwtSecretKey": "ODE5NTEwYjBiYzBjNzk0NDkwYzhhMWE1Y2E2YWU3OWJlOWZiOWYyMTY4YTlkZTAzODJjYjRjYTc1MTZkZmNmODQxZGRjZmMwMTRjZDBhZTY2MWY4YjE3NzhkZjRiZmUxNDBlY2U5ODMzMjM1NjZiNDU5OTQzNDk2OGE4Mjc4MTQ=", "languages": ["en"], "lastLiquibaseTimestamp": 1742871182000, "microfrontend": null, "microfrontends": [], "nativeLanguage": "en", "packageName": "com.mycompany.myapp", "prodDatabaseType": "mysql", "reactive": false, "serverPort": null, "serviceDiscoveryType": null, "syncUserWithIdp": null, "testFrameworks": [], "withAdminUi": true } }

@mshima