CollectionModel | The goal of this pod is provide a data structure | iOS library
kandi X-RAY | CollectionModel Summary
kandi X-RAY | CollectionModel Summary
The goal of this pod is to provide a data structure to represent what a collectionView/tableView is displaying. It enables to extract any business logic from the dataSource of your view to the part of your code that is responsible for generating its viewModel. Which help to enforce a better separation of concerns within your application, and keep your dataSources easily maintanable.
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CollectionModel Key Features
CollectionModel Examples and Code Snippets
Lines of Code : 26License : Permissive (MIT)
Copyclass SimpleCollectionViewDataSource: NSObject,
UICollectionViewDataSource {
typealias ViewModel = CollectionViewModel
var viewModel = ViewModel()
func numberOfSections(in collectionView: UICollectionView) -> Int {
viewMod class SimpleTableViewDataSource: NSObject,
UITableViewDataSource {
typealias ViewModel = TableViewModel
var viewModel = ViewModel()
func numberOfSections(in tableView: UITableView) -> Int {
viewModel.sections.count
} Section(entities: entities) { entity in
cell1(for: entity)
}
Section(entities: entities) { entity in
cell1(for: entity)
if condition {
[
cell2(for: entity),
cell3(for: entity),
]
} else {
Community Discussions
Trending Discussions on CollectionModel
QUESTION
I followed the Spring on Building REST tutorial using HATEOAS at: https://spring.io/guides/tutorials/rest/ and mixed it with JPA and MySQL DB (Maven). When I run the app, I can see the initial 2 tables in MySQL workbench fine (although there is a 3rd one appearing out of nowhere?). If i perform a GET /players, it works fine. When I do a POST Request (http://localhost:8080/players) in Postman with body as JSON: { "playerName":"Pedro" }, I get a 500 status and I get an error from Spring
Not enough variable values available to expand 'id'] with root cause...
I would like to achieve full CRUD operations. A lot of doubts arises here, given that playerId is autoincrement, and the parameter registrariondate is a TIMESTAMP. This is secondary, as I guess the problem comes from making use RepresentationModelAssembler in my app, but not quite sure how to handle the responses and the petitions.
Here the project structure:
Log of the error:
...ANSWER
Answered 2021-Apr-04 at 11:37The method PlayerModelAssembler.toModel(Player player) uses PlayerController.one(@PathVariable Long playerId) to generate a self link.
If the name attribute of the annotation @PathVariable is not provided, Spring expects the parameter name is same as the name surrounded by {} in @GetMapping.
In your original code, the parameter name playerId is different from id. So to fix it,
QUESTION
I have the following ResponseHandler to override a Data Rest Response Handlers. Instead of returning all data, the handler returns only data for the owner (logged in user- currently hardcoded).
...ANSWER
Answered 2021-Mar-31 at 08:55Here is a sample code to achieve this. I have assumed that your Entity has a getter for id as getId().It can be changed as per the code.
There is a need to extend this RepresentationModel on the entity class to get the add method.
eg
QUESTION
I want to know if it is possible to change the word 'content' in the JSON response. Links and content are being created by CollectionModel. JSON example:
...ANSWER
Answered 2021-Feb-09 at 18:27ResponseEntity does serialize from your java-object, usually, it happens by some library such as jackson. There are ready solutions for change property name declarativity. For example:
QUESTION
Spring documentation tells me here: https://docs.spring.io/spring-hateoas/docs/1.2.2/reference/html/#migrate-to-1.0.changes.representation-models that I should use CollectionModel instead of Resources class. But when I do, my IDE tells me that CollectionModel is deprecated. Like here:
What should I do now or use now to achieve HATEOAS in Spring boot?
...ANSWER
Answered 2021-Jan-18 at 18:00Only the constructor is deprecated.
Instead you should use the static method from CollectionModel public static CollectionModel of(Iterable content,Iterable links)
Further informations are here: https://docs.spring.io/spring-hateoas/docs/current/api/org/springframework/hateoas/CollectionModel.html#CollectionModel-java.lang.Iterable-org.springframework.hateoas.Link...-
QUESTION
I've been checking similar issues and haven't found any answer addressing what I am observing.
The issue is that I've easily managed to get Hypermedia in HAL format in my REST API when I retrieve 1 resource, but when I hit the controller methods retrieving a list of entities, then the hypermedia is NOT the same.
Here are the ouputs:
single resource returned
"_links": { "self": { "href": "http://localhost:8080/celsvs/api/books/123567891099" }, "books": { "href": "http://localhost:8080/celsvs/api/books" } }
List of resources
"links": [ { "rel": "self", "href": "http://localhost:8080/celsvs/api/books/123567891099" }, { "rel": "books", "href": "http://localhost:8080/celsvs/api/books" } ]
I started with Spring hateoas 0.25, but as I had to uplift anyway Spring boot and I saw that the Hateoas API had changed, I am now on Spring hateoas 1.0... And even after adapting my code to the new API I am still getting the same result.
I am using the RepresentationModelAssemblerSupport class to keep my controllers clean from code to generate hateoas content. So this is how it looks like:
...ANSWER
Answered 2020-Dec-11 at 05:07The HAL specification says that the property _embedded is used to store an array of resource object.
Edit: To answer Alberto's question in his own answer
Still, if someone can tell me why in the previous implementation the attached links did not follow the HAL format, I would appreciate. Thanks
Spring HATEOAS customizes JSON serialization of RepresentationModel which is the parent class of CollectionModel.
QUESTION
I have created a RESTful API in Java using Spring Boot and began implementing JWT authentication by following this tutorial. After reading some advice on Hacker New, I decided not to use JWT and went and undid everything I added. However, when I re-ran my Java program, and made requests using Postman, it says I am unauthorized - which it did not prior to initially setting up JWT authorization.
My question is, is there a cache somewhere that I have to clear or am I just missing something? Why is it now requiring authorization?
Here is my project structure and code:
FlapiApplication.java
...ANSWER
Answered 2020-Nov-30 at 19:19The solution, as suggested by @M.Deinum, to try a clean install and rebuild the project worked perfectly.
QUESTION
Usually CollectionModel will return an _embedded array, but in this example:
ANSWER
Answered 2020-Nov-01 at 09:20if (optionalMaterial.isPresent()) {
List productMaterials = optionalMaterial.get().getProductMaterials();
CollectionModel productMaterialModels =
new ProductMaterialModelAssembler(ProductMaterialController.class, ProductMaterialModel.class).
toCollectionModel(productMaterials);
if(productMaterialModels.isEmpty()) {
EmbeddedWrappers wrappers = new EmbeddedWrappers(false);
EmbeddedWrapper wrapper = wrappers.emptyCollectionOf(ProductMaterialModel.class);
Resources resources = new Resources<>(Arrays.asList(wrapper));
return ResponseEntity.ok(new Resources<>(resources));
} else {
return ResponseEntity.ok().body(productMaterialModels);
}
}
QUESTION
I am using spring-data-rest and do request like PUT /{repository}/{id}/{property}
ANSWER
Answered 2020-Oct-14 at 16:07Spring Data REST requires a version field annotated with @Version to achieve ETag, according to the official documentation.
If you want to version an embedded property (field), how can you version that single embedded property individually? The answer is impossible.
If you want to version a referenced property (JPA join), then you should make a PUT/PATCH/DELETE request to /{that-property-repository}/{id} instead of /{repository}/{id}/{property}.
QUESTION
GOAL: I'm just trying to invoke a get call on REST endpoint of a Spring HATEOAS application. This is a simple project with MongoDB as the database.
Expected Result: When I try to invoke Get endpoint from the REST controller class, appropriate response should be return.
Actual Result: cannot invoke Get endpoint, giving me an internal server error when invoking using the postman.
below is the REST endpoint I'm trying to invoke
...ANSWER
Answered 2020-Sep-02 at 13:55Are you sure that you want your entities/models; Customer and Order, to inherit from RepresentationModel class which have the property private final List links; ?
If you have a look at the definition of RepresentationModel.java it says clearly that it's a Base class for DTOs to collect links., so IMHO I think that it should be used for DTOs not for entities.
Otherwise if you want to keep it as you described, the only way that I see to avoid the error is by ignoring the links field from being persisted :
- Overriding the getter of
links - Placing
@Transienton the getter oflinksproperty ofRepresentationModelclass
It will look like this :
QUESTION
I'm developing Spring HATEOAS REST api. Now I encountered a need to hide some fields of Employee class (I want to hide some of them).
As far as i understand DTO (data transfer objects) must be used. So i created new class (EmployeeDTO) with only this fields, that I need. I am using ModelMapper to map appropriate fields.
So now, I have a problem with data types. Do i have to change all return values in my Controller from Employee to EmployeeDTO? And then change everything in ModelAssembler?
Or maybe DTO class should extends RepresentationModel? (This forces to extends it in Entity too).
Looking forward for your help, all of this looks kinda messy (changing all return types) and I feel like there should be smarter solution.
That's how am I doing it right now:
Methods in EmployeeController:
...ANSWER
Answered 2020-Jun-19 at 18:18If you want to decouple the resource exposed by your API from your JPA entity, which is a good idea, you will have to update your controller to handle the appropriate types.
See the example below:
Firstly, let's suppose you have the following DTO:
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