Failing to correctly handle complex data could result in malicious users being able to store data they would not normally be able to.
The beloved phrase all Salesforce admins eventually learn and evangelize when training users to log their data and activities into Salesforce so that manager reports can show meaningful metrics.
For the case that the record already has associated records in the database, you have the choice between two saving strategies: When saving, existing links will be removed and new links will be created in the junction table.
If there are existing link in the database to some of the entities intended to be saved, those links will be updated, not deleted and then re-saved. Whenever you add new records into an existing association you should always mark the association property as ‘dirty’.
Some additional advantages of this approach is that it reduces the number of operations to be executed when persisting the entity again.
Please note that this does not mean that the comment with id 2 was removed from the database, if you wish to remove the comments for that article that are not present in the entity, you can collect the primary keys and execute a batch delete for those not in the list: As you can see, this also helps creating solutions where an association needs to be implemented like a single set. The consideration made for patching has Many and belongs To Many associations apply for patching multiple entities: Matches are done by the primary key field value and missing matches in the original entities array will be removed and not present in the result: is allowed to change the validation rules and the saving options, such as the field whitelist.
Before editing and saving data back to your database, you’ll need to convert the request data from the array format held in the request, and the entities that the ORM uses.
The Table class provides an easy and efficient way to convert one or many entities from request data.This is to prevent inconsistent data from entering the entity object.Moreover, the data in When creating or merging entities from request data you need to be careful of what you allow your users to change or add in the entities.Applications will usually have a couple of ways in which data is saved.The first one is obviously through web forms and the other is by directly generating or changing data in the code to be sent to the database.This functionality is achieved by using the custom types system. This means that when retrieving data for that column, it will be unserialized from a JSON string in the database and put into an entity as an array.