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Questions tagged [repository-pattern]

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0
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2answers
29 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
102 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
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0answers
76 views

Repository pattern: anything besides standard CRUD operations? [duplicate]

I'm using a repository pattern, which exposes CRUD operations on the server-side (swift code): protocol Repository { associatedtype T: Model func getAll() -> Observable<[T]> .......
0
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2answers
237 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 ...
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0answers
48 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 ...
1
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1answer
75 views

How does a Repository delete removed Value Objects from the DB without ORM?

Let's say an Entity is composed of multiple ValueObjects. For instance, a wanderer might leave a few footprints behind. Imagine I load Wanderer from a repository and delete all footsteps north of the ...
1
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1answer
55 views

Repository pattern, call another API that updates a SOR's from service or repository class?

We are working on API's that call other API's that will inevitably retrieves/update a system of record like an SQL, MySQL or other database. Sometimes we'll have 3/4 layers of API's before the SOR is ...
4
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1answer
96 views

Repository that performs API calls internally - DDD

Please note: although my question relates to DDD, I am also interested in this from an architectural and OO design perspective. This question may also be a simple case of CQRS and/or interface ...
7
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3answers
373 views

Repository Pattern vs DAL Object Creation

As far as I've learned, the IRepository should contain CRUD. Then we inherit this IRepository in our other Interfaces like IProductand implement IProductconcrete class ProductRepository, with methods ...
2
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1answer
283 views

Access multiple entities in repository - clean architecture

I have a API call that returns a list of Payments, each Payment contains a User. I need to call it, save the results in the database, fetch all the payments and users and return them all to the ...
1
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0answers
38 views

Correct method for handling edit/update scenario in repository pattern

I have a repository pattern employed in my .NET Core 2.1 project. While implementing the edit/update scenario, I have a doubt. My domain: public class Component { public int Id { get; set; } ...
3
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0answers
733 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 ...
-1
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1answer
36 views

Domain model and feature Crypter

In my project I must implement a feature for encrypting some information when it is written into the database, and decrypt the information when it is reloaded. Should this concept be implemented in ...
1
vote
2answers
284 views

Unit of work + repository pattern + dependency injection

I am in the process of refactoring and improving a codebase. One of the major missing features is transactional safety and certain errors arising from each repository having its own DbContext. The ...
0
votes
1answer
35 views

Function for processing files: Business Layer, Service Layer, or anything else?

I read that Repositories should not refer to other repositories. I have a method ProcessFile that refers to multiple repositories, it parses a file, and inserts into many table models in different ...
0
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0answers
25 views

Implementing the Repository-Client and Interface Pattern with a common controller assembly

I'm currently working on an MVC project for a web utility. This utility takes input from a user, sends it off via JSON to an API that reads from a database, and brings the data back in tables; it does ...
4
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1answer
128 views

Repository Pattern whith complementary objects (agregates)

Refactoring an old API into a new one, because of several tools using it (admin and some mainteinance scripts) and compatibility with older versions reasons the database structure must remain the same....
4
votes
2answers
119 views

Handling disposables with dependency injection

I'm struggling to implement disposable objects via dependency injection, as the dependencies are injected in the constructor (and live as long as their containing object does), whereas I want the ...
4
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1answer
356 views

Should unit of work create repository?

Our "unit of work" class has a method which takes a class type and creates a repository: public IRepository<TEntity> GetRepository<TEntity>() where TEntity : class { ...
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0answers
658 views

Proper implementation of Repository Pattern with MVVM in WPF

I am currently refactoring a WPF application that is built on the principles of the Repository Pattern. It uses Entity Framework as its ORM, and is Database First. Each of those entities is wrapped by ...
0
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1answer
112 views

Swapping Entities or ORM in repository pattern

Lets say i am following Repository pattern in my application and i have class UserEntity { private $model; public function __construct() { $this->model = new UserModel(); } }...
-1
votes
1answer
36 views

What is the best way to use table and column names in repository pattern

My application follows repository pattern in the data access layer. However, I see, in repositories' data retrieval methods, column names and table name are hard-coded strings, which I think is not ...
0
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0answers
48 views

Creating a central repository for repositories with related data?

I am building a website for a fruit company. In my database I have a list of countries, and for each country, a list of distributors that sell my fruit products. The country and distributor are ...
3
votes
3answers
190 views

How can database-specific functionality, such as increment/decrement features, be used in DDD?

I have an entity that has a dollar balance property. Whenever an event occurs that causes the balance to change, such as a debit, within the same transaction the balance should be decremented by the ...
0
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1answer
119 views

Is invoking one repository from another a code smell?

I recently came accross an old webapp project which is using a repository layer between domain and persistance layer. However, the repository layer has been used weirdly. One example is the blog ...
1
vote
2answers
329 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 ...
-3
votes
1answer
132 views

Using pattern “Repository” for table relations

Have read about "Repository pattern", before it, I have used pattern DAO (data-acess-object). How should I implement table relations with this pattern? Should I create entity for links between tables?...
1
vote
2answers
98 views

How to implement Domain Model with Repository without leaking responsibility?

Imagine, we have test modules with large number of questions and we can create tests which will contain exactly 30 questions. public class Module { public long Id { get; set; } public List&...
0
votes
1answer
134 views

Hexagonal Architecture and database concurrency

I have been reading Alistair Cockburn's article on Hexagonal Architecture. One question that occurs to me, is how to handle situations where there are database concurrency issues. An obvious example ...
3
votes
3answers
2k views

Data Entities, Domain entities and the repositories

I'm trying to get my head around DDD but I'm stuck. This is how I setup my project: Data Access Layer -Entity models that map to the db -Db connection stuff -Repositories implementations Domain ...
4
votes
1answer
5k views

Generic repository pattern +EF and unit of work

I'm new to this Repository pattern and have seen lot of repository pattern + UoW implementations all over the internet and I'm not able to reach to a conclusion as to which of them is correct . After ...
2
votes
2answers
1k views

DDD - Aggregate inheritance and repositories, how to correctly design this situation?

I'm working on a legacy warehouse system. There is one Aggregate root, Product which has its correspondent ProductRepository. Right now I have a new requirement that says the following: Some ...
11
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5answers
5k views

If Repository Pattern is overkill for modern ORMs (EF, nHibernate), what is a better abstraction?

I've recently read a lot of arguments against using the repository pattern with powerful ORM's like Entity Framework as it incorporates repository-like functionality, along with Unit of Work ...
2
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0answers
165 views

How to implement Repository that supports ORM's validation?

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 to only bring the ...
10
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3answers
7k views

in DDD, should repositories expose an entity or domain objects?

As I understand it, in DDD, it is appropriate to use a repository pattern with an aggregate root. My question is, should I return the data as an entity or domain objects/DTO? Maybe some code will ...
116
votes
11answers
29k 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 ...
0
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1answer
377 views

More appropriate to validate a dependency filter parameter by mock+stub or by expression compile?

My lead is enforcing TDD on our project. He says he's following Uncle Bob (Robert Martin) and SOLID principles. One of the rules he's reinforcing is what I call "the single cog rule"--there should be ...
3
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2answers
207 views

Generic Repositories with DI & Data Intensive Controllers

Usually, I consider a large number of parameters as an alarm bell that there may be a design problem somewhere. I am using a Generic Repository for an ASP.NET application and have a Controller with a ...
2
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3answers
1k views

How to avoid duplication of code related to shared entities in the repository pattern?

I'm building a repository for a large CRM schema that has a high number of relations between entities. Some of the entities are referenced by almost all entities, e.g. Person and Company. Where I ...
3
votes
1answer
6k views

Generic repository unit testing best practice?

How can I unit test my generic repository? Unit testing code: [TestClass] public class UnitTestLanguage { private IUnityContainer _unityContainer; private IUnitOfWork _uow; private ...
59
votes
9answers
29k views

Should Repositories return IQueryable?

I have been seeing a lot of projects that have repositories that return instances of IQueryable. This allows additional filters and sorting can be performed on the IQueryable by other code, which ...
1
vote
1answer
200 views

Is it bad practise to create instances from a SQL-query?

I'm researching ways to create a OO-model/repository-layer using PHP's PDO. My idea was to create model classes that represent a domain object and a repository class for each model that has the ...
1
vote
1answer
2k views

CQRS with Repository pattern and Inversion of Control (with DI)

I assigned a POC project to someone where I asked to implement both Command Query Responsibility Segregation, Inversion of Control (with Dependency Injection) and Repository pattern. “Someone” gave ...
2
votes
2answers
5k views

Unit of work/repository pattern with dependency injection advice

I'm developing a series of repository classes and a UnitOfWork class (plus its IUnitOfWork interface of course). I'm using Castle Windsor, which injects dependencies via constructors. My business ...
1
vote
2answers
155 views

How do you handle objects that need custom behavior, and need to exist as an entity in the database?

For a simple example, assume your application sends out notifications to users when various events happen. So in the database I might have the following tables: TABLE Event EventId ...
7
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2answers
962 views

Should I create repositories with special functions like getStaffActive()?

I have seen lots of articles but none really help me. That is because I want to use dapper as a DAL. Should I create repositories with special functions? Like getStaffActive()? If I use repositories ...
2
votes
1answer
855 views

DDD Model Design and Repository Persistence Performance Considerations

So I have been reading about DDD for some time and trying to figure out the best approach on several issues. I tend to agree that I should design my model in a persistent agnostic manner. And that ...
1
vote
3answers
748 views

Aggregate root & Repository dilemma

I am in a big dilemma here. I have a League, Team and Player entities. I have created a repo for the league only as a Team cannot exists without a League. At first I had bounded the players only with ...
16
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2answers
8k views

Relationship between Repository and Unit of Work

I am going to implement a repository, and I would like to use the UOW pattern since the consumer of the repository could do several operations, and I want to commit them at once. After read several ...
2
votes
1answer
1k views

DDD: Identifying aggregate root

I am designing the a web application using Domain-Driven Design. I have following scenario: Each Application Group can have one Application and each Application can have multiple Configurations. I am ...