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- Is Mapper a valid design pattern or is it a variation of the Factory . . .
The Mapper is essentially a constructor inside out Suppose for a while, if you don't have a Mapper - when you need many seta of parameters they are all arguments on the constructor Now as things evolve, some applications are not aware of additional attributes that needs to go under constructor where one either computes it or use default
- How do Repository and Data Mapper patterns work together?
The problem there is that that now makes the Repository as dependent on the DB as the Data Mapper, which "feels wrong" The alternative is some other abstraction has to be injected into Repository along with the Data Mapper Or else, add more logic to Data Mapper, but then we get into eroding the careful distinction between the two
- Should I mock ObjectMapper in my unit tests?
He does not control it The lib in question is also not slow or so slow that it would need to be mocked for performance, so I don't think it should be mocked It could be replaced with a custom mapper later When testing the OP's methods I don't think that the call to the mapper matters, what I care about is that the result of the method is
- Assembler vs Entity Translator and Entities vs DTO
The mapper is implemented at the boundary of 2 domains, for instance in APIs to map between domain entities and DTOs The mapper itself is often tightly coupled to each domain, but it allows the two domains to evolve independently, only the mapper itself needs to be updated as the schemas diverge
- programming practices - Calling repository inside a mapper - Software . . .
I have a mapper class that maps a model to an entity for JPA In order to keep repository calls within my service, it requires additional loops code in order to get inside the right data, whereas my mapper already loops in through my models in such a way that I can just make a few calls inside there to my repository in order to get additional
- Best practices regarding type mapping and extension methods
Converter Mapper class I create separate class that will handle conversions and implement methods that will take source class instance as an argument and return destination class instance To sum up, my problem can be reduced to number of questions (all in context to what I described above):
- java - Best way to handle lazy models with mapstruct and spring . . .
But here the problem, When mapper starts to convert Engine it will get LazyInitializationException since transaction was already committed and closed in service and Engine is lazy initialized That moves us to Scenario#2 Ok so do the conversions in service then daa! while you still have the transaction opened, in service, so update the getCar
- Am I wrong in thinking that needing something like AutoMapper is an . . .
Automapper is an "object-object mapper" for Net, which means copying objects from a class into another class that represents the same thing Why is this ever useful? Is the duplication of classes ever useful good design?
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