Questions tagged [repository-pattern]

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votes
2answers
8k views

Unit Of Work with multiple database context

I have created an application (net core 2 & ef core) with Unit Of Work and Generic repository pattern. I used to have one database context but due to some business logic I had to create a second ...
0
votes
1answer
54 views

Best practice for pulling bulk data from APIs and storing in database

I have written a small application using ASP.NET Core to create and manage collections of cards for a collectable card game. I currently have a version that successfully downloads bulk card data via ...
0
votes
1answer
103 views

Repository Pattern with Services Layer - Good Practice?

This is my first time I am using repository pattern and applying a layered architecture in a project. I have followed the article found here. The complete code found on the article can also be found ...
5
votes
3answers
3k views

Is it a good idea to share repositories across microservices in Spring Boot Application?

We are migrating a desktop application into web based Spring Boot micro services application with a client imposed mandate of using their existing MySQL database, so all micro services share a common ...
-4
votes
1answer
51 views

Changing databases in general repository methods when using Dapper [closed]

I'm developing a multi-database application. There is one admin database and many customer databases which are identical in structure. I also have a generic RepositoryBase which looks like the ...
6
votes
2answers
1k views

Avoiding Repository pattern - implementing Onion Architecture with DbContext only

I am trying to follow the Onion Architecture to design my application where I have the following layers - Domain Layer: is the inner-most layer and defines repository interfaces Infrastructure ...
133
votes
11answers
45k views

Are (database) integration tests bad?

Some people maintain that integration tests are all kinds of bad and wrong - everything must be unit-tested, which means you have to mock dependencies; an option which, for various reasons, I'm not ...
2
votes
1answer
66 views

Database Model Classes in TypeScript

I'm using Knex.js with TypeScript for database access. Table uid (UUID, auto-generated by Postgres) name (varchar) Model interface User { uid: string | null; name: string; }...
1
vote
2answers
140 views

Repository pattern - using information from other repositories

I am trying to understand what is the proper approach when the objects generated from a Repository have a reference to objects which are responsible for another Repository. Let's say I have terminals ...
0
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2answers
152 views

repository pattern, using the domain object as data access object

I'm very puzzled by a specific part of the repository pattern that seems simple but turn out to be tricky. I took this great explanation of this topic by Mosh Hamedani; it's a C# implementation of ...
0
votes
1answer
83 views

Repository layer with multiple data sources

I am implementing a repository layer in my mobile application. I would like the repository layer to complete to abstract the details about where the data it coming from/ or how we retrieve it from the ...
-1
votes
1answer
903 views

Update Entity for Repository Pattern and UOW Pattern C#

In one mock solution, I have created 3 mock projects to implement layered architecture design mainly the - Presentation Layer (Web) - Domain Model Layer - Infrastructure Layer. I haven't yet to add ...
9
votes
5answers
4k views

Which layer do DDD Repositories belong to?

In his DDD book Evans promotes the idea of layered architecture, and in particular that the business logic should be confined to domain layer and separated from UI/persistence/other concerns. He also ...
-1
votes
1answer
800 views

Is it okay to have one Service with two different Repositories in Spring Boot MVC?

I have a backend Spring Boot API that should have one(?) endpoint that returns some statistics to display in a frontend. These statistics are calculated from data that comes from two different ...
5
votes
4answers
407 views

Should access control be implemented in controller or repository layer?

I've got a project with an HTTP API which returns data from a database. The layers it goes through to get to the API look like this: DB -> Repository -> Controller I'm looking to restrict the ...
-1
votes
2answers
207 views

How to use Dependency Injection on repositories in Generic Repository Pattern with base class inheritance

How to dependency inject repositories that inherit an abstract class (that inherits another abstract class) which implements the interface? I will give you a simplified version of my current ...
-1
votes
3answers
109 views

When adding a ListFooForBar method, should it go into the FooRepository or BarRepository?

I have a requirement to list country codes (e.g. CA, US) by username. A single user may have zero, one or more countries and a single username. A country has a single country code. I have a ...
1
vote
1answer
82 views

Do authorization checks belong in the controller or the repository/persistor

I have a Laravel project where the controllers (all derived from one of two base controllers) use repository and persistor classes to interface with Eloquent models. Authorization logic is implemented ...
1
vote
2answers
725 views

Where to place POCOs validation - N-layers architecture

I am developing an n-layer app. One of the layer is the BusinessLayer and consumes a set of POCOs defined in the CoreLayer. Also I have a PresentationLayer (WinForms) CoreLayer POCOs (classes with ...
2
votes
2answers
1k views

Is unit of work pattern really needed with repository pattern

I am trying to use EF6 with my project. I just watched Repository Pattern with C# and Entity Framework, Done Right | Mosh video. I understand the necessity of Repositories but I still don't understand ...
0
votes
0answers
37 views

Repository Pattern without OR Mapper - Accessing of Attributes

I have a aggregate root called "Billing Document" which has some additional entities as attributes ("Billing lines"). I want to persist these objects together into my database. I read about the ...
0
votes
0answers
151 views

Domain driven design and asynchronous code (repository)

I am trying to write domain code and I am pretty happy with my architecture so far. Problem started at point when I needed to create different implementation of repository, that required asynchronous ...
1
vote
0answers
65 views

Changing entities in Clean Architecture

I'm modeling the "Domain" Layer of "Clean Architecture" for an application that gets its data from an XML file when starts. The XML file looks like: <?xml version="1.0" encoding="UTF-8" ?> <...
0
votes
0answers
62 views

Implementing Core Data parent-child context relationship via Entity Framework

I'm working on porting an iOS app to Xamarin, where it's hoped that the Xamarin project will match as much of the logic and layout of the iOS project as possible. One big area that the iOS project ...
3
votes
2answers
158 views

Should entities have nullable id because they're autoganerated by the database?

Suppose I have a domain entity representing a person. (Examples in TypeScript) class Person { constructor(public name: string) {} } Now, because other parts of the domain will need to reference ...
-4
votes
3answers
283 views

Why local database should be the only source of truth for mobile application?

Being mobile developer for quite some time (ios/android) I've learnt that local database is very rarely needed. Mobile application are mobile by definition, they usually serve only as clients to ...
-3
votes
1answer
109 views

Is it acceptable to ditch the Repository pattern in a layered architecture?

My app is using this kind of layered architecture: Controller > Service > Repository > Data Mapper > Persistence Often I notice that my service methods are just directly calling ...
2
votes
1answer
1k views

Clean architecture and Repository pattern

I'm working in a new project and I'm trying to use the Clean Architecture approach with Repository pattern. I'm using .net core 3, C#, Automapper, MediatR and Dapper. I have these layers: Domain (in ...
7
votes
1answer
298 views

How to prevent concurrency problems when using the repository pattern?

Considering that: when using the repository pattern you deal with entities - those are the atomic units you persist (regardless of Hibernate or "manually") when changing an entity you save it as a ...
2
votes
1answer
80 views

Should I use Repositories or wrap that logic in an additional service layer in my Controllers

I am building a Loopback4 app just for learning; I have a scenario where I have to check for a couple of things before sending that request to the database, so my entry point is my Controllers Method, ...
2
votes
3answers
659 views

DataAccess Layer coupling with Domain Layer

We have an issue with how the implementation of the Data Access layer (EF6 Includes more specifically), influences the behavior of our Domain layer. A theoretical example to illustrate: Application ...
1
vote
1answer
331 views

Is it acceptable to invoke business logic inside the repository layer?

I'm learning DDD and I'm wondering if it's ok to invoke domain model logic from inside the repository layer? I don't mean that the business logic exists as part of the repository, merely that the ...
0
votes
1answer
70 views

How to access parent relationship in repository pattern

I have two models Permission and Role, now in roles/create, I need to show all the available permissions to allow admin to select the permission and create a role, now should I import both ...
3
votes
2answers
621 views

How to implement Repository that supports ORM's validation?

Domain Driven Design(DDD) has an abstract repository pattern to handle saving and fetching/finding entities in storage (db, external service, doesn't matter). My question is if Repository Pattern has ...
0
votes
1answer
53 views

Questions about Direct access to data source from Services

Background: I'm trying to separate my concerns in the application architecture the best possible way. In a nutshell: The requests are parsed and go to an Action Action decides which service(s) to ...
2
votes
1answer
181 views

Mercurial topology in three stage implementation

A few years ago, now, we had a chap working with us who introduced the following topology for Mercurial... The main repository server obviously holds the primary repositories, as you'd expect, but ...
2
votes
1answer
835 views

Domain Driven Design - updating part of aggregate

I'm playing around with DDD in a node.js project and struggling with updates to child entities from the aggregate root. For the sake of example, let's say I have two domain objects where Event is my ...
2
votes
2answers
501 views

Dependency inversion vs repository pattern (app layer dependency on ORM)

Let's say we have an application layer with some command handler and we use an Entity Framework database context/ORM context in that handler. I would invert dependencies from the Entity Framework/...
0
votes
1answer
151 views

Does a 'leaky' repository implementation defeat the point of a repository?

I've seen some tutorials and examples of implementing a repository pattern, and I don't quite understand something. My impression was that the whole point of a repository pattern was to hide the ...
1
vote
4answers
201 views

Object Oriented Design: Repositories and Inheritance

I have an OO design concern. Let's say my models as following: class Account {} class LocalAccount extends Account {} class SocialAccount extends Account {} These Account entities are persisted and ...
1
vote
2answers
831 views

How to get ORM (Ef Core) Entities follow a DDD style . Which is the best approach?

I am considering mutliple options to face a problem. I want to develop software following DDD style. The problem arise when I have to define my entities and I am working with Entity Framework Core, ...
8
votes
2answers
4k views

Should Entity Framework 6 not be used with repository pattern?

So I am asking this after reading the following: Why shouldn't I use the repository pattern with Entity Framework?. It seems there is a large split of people who say yay and those that say nay. ...
0
votes
1answer
300 views

Circuit Breaker + Retry - Repository or Application Layer

I currently have a Web App using ASP.NET Core 2.2, Domain Driven Design, Clean Architecture, and CQRS. I'm using MongoDB as persistence. I have developed a Repository pattern to abstract the MongoDB ...
-1
votes
1answer
33 views

where to put business constraints

We have a 3-tier architecture: Web, Business, Models using the MVC pattern. Models are Code-First using EF6. Currently we access the dbContext directly in our Controllers to query and save changes. We ...
5
votes
3answers
219 views

Is a repository return a graph of entities violating SRP?

I'm working in this scenario Post entity has many Image entities. I also have repository to both entities: PostRepository ImageRepository Since this entities are tightly related, when I get a Post ...
15
votes
1answer
10k views

How to structure microservices in your repository

I am assigned to a project where we have about 20 micro-services. Each of them is in a separate repository without any references to any other, apart from one Nuget package where we maintain some ...
-1
votes
2answers
42 views

Logic to create/update values while maintaining their uniqueness (in a multi-threaded environment)

Assume I have a dumb repository which stores numbers (for sake of this example). It is dumb because it may only create new record, update specified record and list all the existing records - no other ...
0
votes
2answers
2k views

CQRS using queries or read services only?

Discussing about a CQRS implementation with my team we don’t agree on a point concerning the Query side. On the Commad side we have actual command clases; a CommandDispatcher that schedules commands, ...
0
votes
2answers
547 views

Is it ok for Repository Pattern to contain unusual method names?

For example I need to find a user which its status is 0 and its name is John. So beside usual methods for a Repository pattern (e.g. find, create), I decide to create a method in UsersRepository ...
1
vote
0answers
84 views

Should a UnitOfWork contain every Repository?

I'm trying to get the Repository/UnitOfWork pattern figured out. We're working on a project with EntityFramework and our DBContext contains 200+ tables. Right now our approach is to inject whatever ...