![]() Do collections have a Save() or Update() method? No! Here’s an example:Īnother reason your repositories should not have a Save() method is because sometimes as part of a transaction you may work with multiple repositories. I repeat: think of a repository as a collection of domain objects in memory. Yet another very common mistake! As I’ve explained in my YouTube video before, your repositories should not have a Save() or Update() method. What if you return OrderViewModel but somewhere else you need OrderDetailsViewModel or OrderSnapshotViewModel? So, the client of the repository should decide what it wants to map the Order object to. By mapping the domain objects to view models (or something else) inside a repository, you prevent the client of your repositories from getting access to the underlying domain object. Your repositories should return domain objects and the client of the repository can decide if it needs to do the mapping. It’s the responsibility of your controllers. Mapping is not the responsibility of the repository. I’ve seen many students using AutoMapper inside their repository methods: So it should not return view models/DTOs or anything that is not a domain object. Once again, a repository is like a collection of domain objects. Repositories that return view models/DTOs Instead, you should have a separate repository per domain class, like OrderRepository, ShippingRepository and ProductRepository. If you’re building an application called Vega, you shouldn’t have a repository like the following: You should think of a repository as a collection of domain objects in memory. ![]() While reviewing various solutions, I’ve encountered a few common mistakes in the implementation of the repository pattern. It’s the number one language employers are looking for and gives you 4x more job opportunities than C#.Īs part of my new ASP.NET Core course, I’ve been encouraging my students to post their code to GitHub. ![]() UPDATE (Nov 5 2018): While you’re here to become a better C# developer, I strongly recommend you to watch my Python tutorial on YouTube. docker-entrypoint.sh db: # the name here can bu changed, # but it will be used as the reference to it # for example in the DB_URL image: mongo:4.0-xenial ports:Īfter that, in the same directory, run these commands to build, inspect, and tear down.April 3rd, 2017 Comments 4 Common Mistakes with the Repository Pattern wait-for db:27017 & migrate-mongo up & npm start # equivalently command. backend:/app # you can also overwrite the CMD # command. 3001:3001 environment: # set env environment DB_URL: mongodb://db/vidly volumes: # easy volume mount frontend:/app # this is the line for test command: npm test api: # here we don't want to rebuild an image, we want to re-use one image: vidly_web # and yes we still want quick mount volumes: frontend:/app # and we can define test for web or api here as well, # just notice that it might be a little bit slow. # this is the folder for this container that folder # shall include everything a docker container will need build. You can also copying files inside and out: if you remove the related docker image and docker container, the file will still be there on the volume!) Copying Files between the Host and Containers even you created something in a container on this volume, the file will remain there as far as the volume is there (i.e. (So we shall create the data path in the Dockerfile to avoid this situation.)Īnother interesting part of this docker volume is that. However, if the doesn't exist, docker will create under root user, which will prevent other users from reading or writing to it. Note that if or doesn't exist, docker will create it for you. # then, you can check it via interactive shell Docker volume create # You can check the info of the volume:ĭocker volume inspect # to mount the volume to a container:ĭocker run -d -p 80:3000 -v app-data:/app/data react-app:2
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