How can I prevent mapstruct from mapping lots of fields without having to exclude them all manually?

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I'm using mapstruct to map an object to a DTO. My object has 100 fields that need to be mapped in the DTO, and about 30 that shouldn't be mapped.

How can I ignore the 30 fields without having to write 30 times 

@Mapping(source = "fieldtoIgnore", ignore = true)

I'm not looking to ignore the warning, I want to completely prevent mapstruct from mapping some fields

Thank you

mapstruct dto jakarta-ee java
1 Answers

You can define on the mapping method the following annotation:

@BeanMapping(ignoreByDefault = true)

this will make mapstruct to ignore by default all matching fields between the two classes.

Here is a Quotation from Mapstruct documentation regarding this annotation:

By means of the @BeanMapping(ignoreByDefault = true) the default behavior will be explicit mapping, meaning that all mappings have to be specified by means of the @Mapping and no warnings will be issued on missing target properties.

and link to the javadoc: http://mapstruct.org/documentation/stable/api/org/mapstruct/BeanMapping.html

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