Questions tagged [repository-pattern]
Pattern that aims to manage a set of persistent objects or a database by providing an interface that emulates a collection.
140 questions
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How to handle overfetching efficiently with repository pattern in large applications?
I'm working on a large Typescript project in NodeJS with Prisma, where we have dozens of domain entities—some with 30+ fields and complex relations.
We're using the repository pattern to abstract data ...
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Is there a better way to soft delete navigation properties in Entity Framework 6 when using Repository pattern?
public void ReassignLineItems(InvoiceUpdateDto invoiceUpdate)
{
Invoice invoiceInRepository = _unitOfWork.InvoiceRepository
.FirstOrDefault(invoice => invoice.Id == invoiceUpdate.Id);
...
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What data type should a repository return?
In domain driven design, repositories are created for aggregate roots only. Does this mean that all repository methods should return an instance or a collection of the aggregate root for which the ...
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3rd party REST API calls in repository pattern
For a long time, I’ve been using Repository pattern to abstract data access logic from actual business logic, always using SQL or noSQL databases as my data source.
But how much valid is it, to ...
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Clean Architecture Chapter 8 - Financial Data Mapper
I’m studying Clean Architecture, and I came across a technical concept in the diagram from chapter 8. In this chapter, the author states that the Financial Data Mapper implements the Financial Data ...
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Passing In-Memory Specification to Repository
I am working on my DDD know-what/how and have the following questions related to the Specification Pattern, the Repository Pattern, persistence agnosticism, and performance.
Consider, for the sake of ...
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Where to put getOrSave responsibility?
I have many repeated parts of service logic which just fetches object if it exists or returns a newly saved one.
I want to move it from service because it just clutters up the logic. But I do not ...
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What is the correct way to configure a testing mode on a class?
I have a repository which reads and writes to Firestore, and some tests to make sure data is sent and comes back in the correct way.
In order to test this I added a protected function which returns ...
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How to structure repositories for a small number of entities?
I am working on a project implemented in DDD style, and I use Repository architecture pattern to persist domain changes. I have multiple roles in domain layer, and that's what raises my question - how ...
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Repository concerns
We have a layered application with (basically): WebAPI, App Services, Domain and Repository layers.
This fits for most situations, but now we face a slightly different challenge on where we need to ...
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How to Access the Private State of an Entity in the Save Method of its Repository
Consider the domain entity, Order, which can be persisted by the OrderRepository. Orders maintain state that is stored in the database. However, it does not expose all of it directly. That is, parts ...
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Is it an anti-pattern to use interface for entity?
I read an article about that using an interface for an entity is an anti-pattern for these reasons:
Your interface signature is identical to your class.
There’s only one implementation of your ...
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How to properly use Data Transfer Objects
I feel something is wrong with my approach handling MVP and the Repository Pattern. I'm making an album winform app just to practice MVP, crud and the Repos. Pattern.
First some code.
The model:
using ...
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Should I save my entire domain object or update individual properties?
Scenario:
An application is going to perform operations on an entity. That means retrieving it from storage, possibly making modifications, and then persisting those changes back to storage.
I'm ...
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How to implement Repository if only part of Entity properties are needed?
From many articles and answers on DDD Repository pattern, I got the feeling that a Repository should only CURD an Entity (Aggregate Root) as a whole.
Following this convention, we always need to query ...
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Build a Rust project using Clean architecture and DB transactions in the same DDD bounded context
This is just an example of an (still incomplete) real-world project written in Rust using a clean architecture: https://github.com/frederikhors/rust-clean-architecture-with-db-transactions.
Goals
My ...
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Using Repository Pattern with .NET Entity Framework with a single Get method with optional parameters for each table include
We have a very messy data repository component, with dozens of methods to interface a DbContext (entire database) in Entity Framework.
It was (and is) coded in a way that adds a new repo method for ...
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Best practices repository and service layer
I have read many articles about repository pattern and service layer but I have still some doubts in certain arguments:
Repository should return only aggregates and I should have repositories only ...
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Generic Repositories with different IDbConnections
I have two different connection strings for two different databases.
My first database has 2 relational tables:
First table has some default fields,among which average on UI, and some additional ...
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644
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What if a Repository needs to apply Business Logic to load an Aggregate?
I have an aggregate User and the user has a Score. The Score of a user is calculated by queriying a bunch of different tables and running through (often very large) result sets applying some business ...
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Where/how does the conversion of entity objects to data transfer objects take place in Clean Architecture?
Prolog:
I have a domain-layer which contains some entity-classes like Customer.
I have a application-layer which contains some data transfer object classes like CustomerDto.
My Problem:
At a presenter ...
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Should repositories return self persisting entities?
In domain driven design
A repository is a collection like "interface" that hides data source access. It furnish add, remove and retrieval method just like a collection would. It does it ...
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Are repositories async?
Repositories in ddd should give the illusion of an in memory
collection.
and
A Repository is essentially a facade for persistence that uses
Collection style semantics (Add, Update, Remove) to supply ...
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How to model transactions in a client-side functional DDD?
I'm new to DDD and I would like to clarify some concepts. I'm thinking about DDD in the client-side.
The first one is regarding transactions:
My understanding is that transactions are a responsibility ...
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How to manage the entity which have collection of child entities in DDD?
A play arena contain a list of Machines and Amenities
playArena :
guid : GUID
name : string
location: Location
owner: string
amenities: Amenities
playing_machines: PlayingMachines
...
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Clean Architecture: How to decouple the Repository from a CommandHandler?
We are just starting with event driven (and clean) architecture.
So far we have two main entrypoints, a consumer (reader from a Redis Stream / Kafka Topic), and an API.
As this is almost a modular ...
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Design pattern for persistent data storage - load and save arbitrary file, database, api etc
I have the following problem - I write the code for object data manager, and one of requirements is being able to save/load data into some persistent data storage. I want to make it as the following:
...
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How to integrate Androidx Paging-3 in Clean Architecture?
This blog on "Clean Architecture" describes how to build a modular Android application along with using Clean Architecture.
In that example project, the author places the business logic in a ...
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How to conform two repositories that work on the same entity but have different methods?
I have to implement 2 use cases, the first one is going to create a Company profile from its document number, so inside the use case, it reaches out to the third party API that contains information ...
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Difference between Strategy pattern and Repository pattern
I found the following definition of Repository Pattern:
Repositories are classes or components that encapsulate the logic required to access data sources. They centralize common data access ...
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In a layered architecture with exchangable data providers, how to deal with provider-specific implementation details?
Assume an application architecture with three layers (presentation, domain, data access - though presentation is irrelevant to this question) that follows dependency inversion:
The domain layer ...
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Should integration tests of a repository pattern use low-level ORM calls
Problem summary:
In an application with wrapper methods over SQLAlchemy add() and query() methods, can integration tests that use the add() method wrapper use the query() method wrapper to validate ...
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To which Clean Architecture layer should repositories implementations belong?
It's very common to see this use of repository in projects using clean architecture:
interface Hero { }
interface HeroRepository {
findById(id: number): Hero;
}
class FetchHeroUseCase {
...
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Is it a bad idea to save the database in middleware?
So I've implemented the repository pattern in a lot of projects, but there seems to be a bit of a discussion on what is right with this pattern. Previously, I've always added Update or Create methods ...
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Retrieving related information using the repository pattern [duplicate]
I'm currently working on refactoring a project to use the repository pattern, but I'm currently struggling with how related information should be retrieved.
Let's say I have a Hotels and Rooms. I have ...
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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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Obtaining application generated ID from repository 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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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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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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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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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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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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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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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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answer
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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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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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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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Data Repository and Complex Queries (DTO)
Following the classic 3 layer architecture
domain Model (a list of domain models live there and has no dependencies)
DAL layer - My Repositories lives there with DBContext implementation (Ado.net) ...
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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 ...
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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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