Ignore null values

[Vbuch]

Hello Team, 

Any idea how to ignore null values / not set properties on the source to target mapping?

In my case, I am converting a DTO to a JPA Entity. My JPA entity has an auto-increment field (cust_id) which I do not want to insert manually upon saving. 
When I try to map DTO to Entity using map struct, map struct sets the ID to 0 or null (Please note I do not have ID property set on DTO).

I tried using ignore on target as follows but it still sets it. Any help on this will be highly appreciated.

 @Mapping(target = "cust_id", ignore = true)

Customer customerDtoToEntity(CustomerDto customerDto);

Thanks!

[Filip Hrisafov]

Hey,

Can you please share how the getter and setter for your `Customer` look like?

What do you mean with MapStruct sets the ID to 0 or null? How does the generated code look like?

Cheers,

Filip

[Edson Alves Pereira]

For my understanding, a null ID means that this object is not persisted to database, then is completely right mapstruct live that way, if you get the entity from the persistence layer it will have an ID with a valid value. That is the way it works for me and I use all my IDs generated by database.

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[Edson Alves Pereira]

Just curious about, your IDs must be object as most of all properties to JPA, if mapstruct is giving you a 0 ID, maybe there is a change you are using a primitive property.