Questions tagged [dto]
Data Transfer Objects are for moving data between processes.
99 questions
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Is exposing full backend entities to a Vue frontend a bad practice? A case for DTOs?
I am doing the frontend for a Java Spring backend. The project uses JavaFX for the front but I a migrating it for web usage (with VueJS). When I make an API call to retrieve an object, I am receiving ...
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2
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177
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How could I map a complex DTO to a Domain Aggregate in a Repository?
I'm working on a TypeScript application designed with DDD and using layered architecture. My infra layer has a repository that fetches a complex, nested DTO. My current implementation maps this DTO ...
2
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153
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When Should We Separate DTOs from REST API Serialization Classes? [closed]
We know that combining a domain entity, a DTO, and a REST API serialization class into one won't pass code review:
@JsonInclude(JsonInclude.Include.NON_NULL)
@Data
@Builder
@Entity
@Table(name = "...
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3
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502
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Do I really need this many (DTO) types for mapping a simple object to CRUD & database?
Say I'm building my own backend framework (really I'm just learning) and I have a simple class:
class User {
String email
String passwordHash
Date birthdate
Int getAge() {
...
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3
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622
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Autogenerate DTO classes?
Yesterday I screwed up:
One of the classes of my C# contained a property, called "DeliverdQuantity" (yep, there's a spelling mistake indeed). When I saw that, I decided to correct that, ...
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444
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DTO Interfaces naming convention in PHP
It might be that my question would sound a bit stupid but I would like to find the best way for naming my DTO interfaces. In my PHP application I have following DTO types:
Simple (which contains a ...
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1
answer
222
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DTOs and Single-responsibility principle
I'm developing a PHP application and trying to understand DTOs in context of single-responsibility principle. Being more specific, is it a bad practice having helper methods like toArray(), getValue(),...
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5
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1k
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DTO vs POJO (Entity) on POST request
If I have for example a User POJO like the following
@AllArgsConstructor
public class User {
@Id
private final String id;
private String username;
private String password;
private Date createdDate;...
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4
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2k
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Is it a code smell to modify a data transfer object (DTO) within a loop in a Spring service controller?
I have a Spring service that acts as an adapter for another service in my company. The service receives a request to generate push notifications for a given user and needs to call the other service ...
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4
answers
3k
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Validating data classes with nullable properties that should never be null
When retreiving data with an api and saving it in a DTO, some values are nullable: null on initial class initialization but VS also warns you for this. For example, an employee:
public class ...
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384
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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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3k
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Three layer architecture and using DTOs to transfer data between layers
I have a 3 layer architecture application with presentation layer, business layer and data access layer. UI -> BLL -> DAL UI Layer has reference to only BLL and BLL refer only to DAL.
My BLL has ...
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2k
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Is it OK to return different DTOs for the same endpoint when the user is logged in vs when it is anonymous?
Say that I have a REST endpoint for a chess server. If I'm not logged in and do a GET on /games I could get all running games like:
{
running_games: [
.....
]
}
but if I'm logged in I ...
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509
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Do usecase-class work with domain-model or data-model at cleanarchitecture?
I interessted in the "usecases" and "how they interacts with the "context" at "clean architecture".
If I understand right, there will be two contexts.
First is the ...
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2k
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CRUD service with or without DTOs
I'm about to create a service providing a simple CRUD Json REST-API. The main requirement is that documents stored/received always conform to a schema provided as JSON schema. So here's the thing:
...
- 119
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1k
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Mapping destination object from multiple source objects vs constructing using multiple source objects (as in constructor)
Lets say we have DTO class with 15 properties. Usually DTOs like these are mapped from other objects. But sometimes some DTOs may use values from multiple objects. In these cases, should we “Map” or “...
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426
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.Net Core Api - multiple Dto’s for single entity
I want to know the best Practice is about having multiple dto’s for different use cases.
Let’s say we have an api with a set of controllers to handle requests coming from a administration backend and ...
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1
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215
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Best mapping practices in an enterprise application
This question might seem like a trivial question. But here it goes.
Currently, I'm working with this .NET Core application, an N-tier application consisting of a Vue frontend, business logic layer, ...
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5k
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Is it a bad practice to use transformation functions within DTO objects
I'm looking for some guidance. Is it a bad practice to use transformation functions within DTO objects?
I have this example
public partial class AgEmpDto
{
private DateTimeOffset ...
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88
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MVVM List<T> from Model to View
I am writing a control app for a 6-DOF robot.
This app can send scripts to the robot, which in turn executes these and thus moves around.
In the app a robotprogram can be created by adding 3D ...
- 1,011
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1k
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Should the Use Case be responsible for transforming its primitive parameters into typed data for the Entity to use?
I'm building a Use Case for creating blog posts, this Use Case has its own "DTO", which is basically a parameter object with only primitive data, as follows:
Use Case's DTO (Parameter Object)...
- 391
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1k
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Should I run validation logic on the DTO or the entity model?
Suppose I have a Controller that takes a DTO that represents an Order. This DTO has inner DTOs that could potentially have entity IDs and/or entity data that's used to create an entity dynamically ...
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646
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Dealing with business logic on DTOs using a DDD
I have a scenario in which an Entity defines an EntityRepresentation that is created from another end. The EntityRepresentation is a value object that implements some logic that should be performed on ...
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11k
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When to use entity and when to use DTOs
Hi I am very new to using DTOs, and I am starting to understand it slowly, but there are still some missing puzzles for me.
I understand the use of DTOs in the way of decoupling the persistence data ...
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4k
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Is it okay to add userId to a DTO object?
I'm implementing the validation layer for a certain method on a controller, namely I need to check if certain image ids passed do really belong to the user making a request. In order to do that I need ...
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1k
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Design of DTO-Objects for an API with dynamic table design
We have a table design in our database to dynamically store settings:
You wouldn't need to understand every column in the table but basically tbl_Setting defines all possible settings and ...
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6k
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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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644
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How to retrieve login token from repository in network layer? Domain Driven Design - DDD
I am trying to come up with a design for an application I am working on.
Here is a basic picture of what I am looking to do. Everything up to the Data Layer is totally fine but the Data Layer makes ...
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2k
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Should the DTO be able to parse itself from and to Domain?
Let's say there's the class Book, with different models in different endpoints:
Endpoint A (consumer):
class Book{
Map<string,string> chapterName_content
}
Endpoint B (provider):
class Book{
...
- 145
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2
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3k
views
How to share entity classes (JPA) among projects, where not all have DB access?
So, I have project in which several WebServices will be created (REST). For the sake of simplicity, Lets name them A, B, and C. A and B handle different tasks, but both of them consume C, which is the ...
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1k
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Separate DTOs consequently for each module?
Following the hexagonal architecture and package design you will have somewhere an entry point reaching to your core functionality. Often this is done by using a facade.
To hide the core logic from ...
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662
views
Different fields for GET and POST methods in REST
I have a collection /users/{userId}/tools
and I want to GET and POST to that collection. Can I have different representation of that object based on the method?
For example, for POST I want to send ...
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1
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5k
views
Is it necessary to have DTO to domain entity mapping always?
I am working on a WebAPI application which follows the layered approach like Controller > Service Layer > Repository Layer > Entity Framework Core (SQL / Cosmos) The view is in Angular.
In many of ...
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7k
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Best practice for references in DTOs and entities in Spring
Given the following architecture and frameworks:
Spring Boot Application with Spring Data JPA (Hibernate is used as OR mapper); layered architecture as followed.
REST layer
Service layer
Persistence ...
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1
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176
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Are aspects of domain driven design limiting when we scale?
From what I have read about the domain driven design, an aspect of it is that there is a clear separation between domain objects and DTOs.
So the application level components deal with domain objects ...
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466
views
Is there a design pattern for transferring "partial" or related data objects?
I am writing a program in Kotlin which parses some input data and writes it to a MySQL database (through JDBC).
The database includes tables such as users and each table has a corresponding data ...
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1
answer
145
views
Defining characteristics of mutable data structure objects
Assume we have data structure objects - some of them are DTOs and some of them are VOs. Also assume that Value Objects are immutable and Data Transfer Objects are immutable and readonly, then:
How ...
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1
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1k
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Mapping bidirectional 'toMany' relation from DTO to entity
The application that I am working on has numerous ...toMany relations, e.i. class Model can have several parameters. In Unidirectional world, it is simple to manage a collection. I can clean the ...
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2k
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Role of DTOs in Rich Domain Model
I work with Spring applications. Recently I have found this article about the Anemic Domain Model.
They recommend putting logic in Entity classes. It solves a problem that Martin Fowler described in ...
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1
answer
430
views
Centralized REST API call management?
I was given a solution with many projects. Multiple projects call multiple REST APIs. These calls are scattered around the spaghetti code. Trying to figure out what calls are done in what sequence ...
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496
views
What is optimal number of entity abstraction levels?
Sorry about the vague question, please do suggest different formulations. Anyway here is the kernel of the question:
How many classes representing an entity/resource or whatever you want to call it, ...
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195
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How to add supporting information to the existing java object?
Is there a way or design pattern to add supporting information to the existing java object?
Example I have a model class Parent and it has child models. Its nothing but hibernate entities with parent-...
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288
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Looking for clarification on pub/sub systems and how an API gateway comes into play
I'm new to micro service architecture and I'm looking to understand how services should/can interact with each other.
The acceptance for my current story requires me to:
Email a document
Backup the ...
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18k
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Is it anti-pattern to have inheritence in a dto?
Are data transfer objects or POJOs meant to be final or can they be extended and create hierarchies for them?
It is not clear to me if such a value class is properly designed only as a final class and ...
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2k
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REST API: what should PUT do with complex objects?
Let's suppose I have the following objects in my domain:
class Warehouse
{
int Id;
string Address;
Item[] Inventory;
}
class Item
{
int Id;
string Name;
int Price;
int ...
user291864
3
votes
1
answer
807
views
DTO Design in Depth
I'm extending an existing application, which has an attempt at a logical tier design, using DTOs, a Services layer (business logic), and a DAL. However, as I'm investigating more about DTOs, my ...
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360
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Is using a pattern on a completely wrong way a terrible mistake [closed]
This is maybe a strange question, but I just trying to understand my colleague.
I know what is DTO, and what should be on it, but not that long time ago I found the whole micro-service written on the ...
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900
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In a DDD CQRS API, is it preferable to have a separate DTO per query or per representation of a resource?
I am in the middle of starting up a new project and just wanted some reassurance as to which approach to DTO's returned by the read-side was easier to maintain in a real world application with ...
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3
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2k
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Domain Models with complex properties construction
According to this article: Using Ids in Domain Models is not a good practice.
We should reference the entire domain model instead.
In this case, when we want to provide only Getters for our ...
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642
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Manage table relationships in Java dynamic web application that accesses a database, without using any framework
I'm developing a web application for academic purposes.
What i have to do is a simple website which keeps track of realties along with their respective owners and the tags they are bound to.
The ...
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