Questions tagged [repository-pattern]

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96 views

Encapsulation of External API in Infrastructure Layer AS Persistence

My question is about DDD, the Infrastructure layer, it's relation to the Domain, and specifically how we can take advantage of the ability to "swap out" one persistence implementation for ...
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1answer
59 views

Obtaining application generated ID from repostory or from entity constructor?

In the Book "Implementing Domain-Driven Design" the author suggests to implement a repository method to provide the next application-generated (not database-generated) ID. Like so: class ...
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1answer
63 views

Builder that creates a repository for a specific entity - is this an established pattern?

Suppose I have the following entities: class Employee { public string Id { get; set; } public ICollection<EmployeeBadge> Badges { get; set; } } class Badge { public string Id { get; ...
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3answers
254 views

Some thoughts on the Repository pattern

Until this moment, I have seen a lot of variations and combinations of the Repository pattern, implementations that simply queried the required information, some used something like a mapper, some ...
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0answers
19 views

Repository Pattern to support Bounded Context

I am building a REST Api from scratch so i am overthinking and revisiting various approaches and best practices. I have a Materials repository that serve all the sub-domains of our logic. Also i have ...
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1answer
132 views

CRUD is too simplistic for my usecases, how would you handle the repository pattern when using MediatR and EF Core?

I have a .Net 5 Web API project and use MediatR to encapsulate my business logic into commands and queries since I don't like to have a single CRUD service handling everything related to a specific ...
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3answers
150 views

domain model logic behavior (ddd)

How domain model capture business logic / domain logic since i cannot access repository? I see many posts saying that domain model = business objects But Business objects live in application layer (...
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1answer
183 views

C# Design for database queries and commands

Currently I'm working on a project that will interact with a database. Based on my research, I would like to develop a repository class which responsability is to write/extract entities to/from a ...
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1answer
131 views

ViewModels and DTO mixed with repository pattern

Some parts in our project's codebase implement the repository pattern in a different way from what we usually do Here's the example public class Repository : IRepository { public Repository(...
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1answer
67 views

Managing Documentation / Source Control for a Full-Stack Application Across Multiple Repos

TL;DR I have a moderately sized/complexity web application (Angular 11) in one repo and a standalone REST API (.NET Core 3 / C#) in another repo, and am trying to figure out the most efficient way to ...
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2answers
938 views

Error handling for repository: exceptions or wrapping return value?

The question is about a desktop application I'm creating in C# and WPF. As very common I'm using the repository pattern in my Data Access Layer for my CRUD operations. All data comes from the ...
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1answer
45 views

Deisgn Pattern: How to map UI requests to Controllers to Services?

I'm learning about writing WebApi design patterns. I am trying to create a simple CRUD web app with ReactJS UI and C# .NET CORE webapi with sql backend. Articles show that specific Repositories are a ...
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47 views

Structure convention for DTO in a WebApi project based on simplified repository pattern

I need to organize all my DTOs in a WebApi project done with .Net 5 and EF Core 5, based on repository pattern. I'm wondering if it's better to add the DTOs container (folder and namespace) under the ...
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2answers
402 views

Data Repository and Complex Queries (DTO)

Following the classic 3 layer architecture domain Model (a list of entities live there and has no dependencies) DAL layer - My Repositories lives there with DBContext implementation (Ado.net) Dal ...
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1answer
99 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 ...
1
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1answer
806 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 ...
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1answer
59 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 ...
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2answers
558 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 ...
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1answer
146 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 ...
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2answers
302 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 ...
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2answers
1k 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 ...
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4answers
831 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 ...
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2answers
251 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; }...
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3answers
111 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 ...
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58 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 ...
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2answers
3k 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 ...
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1answer
3k 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 ...
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0answers
104 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" ?> <...
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2answers
166 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 ...
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3answers
714 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 ...
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1answer
139 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 ...
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1answer
3k 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 ...
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2answers
3k 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 ...
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1answer
628 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 ...
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1answer
103 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 ...
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1answer
161 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, ...
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3answers
1k 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
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1answer
802 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 ...
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1answer
85 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 ...
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5answers
10k 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 ...
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1answer
74 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 ...
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1answer
2k 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 ...
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1answer
196 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 ...
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1answer
1k 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 ...
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2answers
708 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/...
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1answer
182 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 ...
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4answers
203 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 ...
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2answers
1k 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, ...
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3answers
5k 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. ...
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1answer
434 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 ...