When providing the incorrect format of a field for a request to my application if the type throws an error then the error message returned by micronaut is vague.
E.G two scenarios
public class fakeClass {
#NotNull
private String fakeName;
}
if my request is {"fakeName": ""}
then the response, correctly, would be something like
{
"violations": [
{
"field": "create.fakeClass.fakeName",
"message": "must not be blank"
}
],
"type": "https://zalando.github.io/problem/constraint-violation",
"title": "Constraint Violation",
"status": 400 }
But lets say my class looks like this:
public class fakeClass {
#Format("yyyy-MM-dd")
private LocalDate exampeDate;
}
With an invalid date or incorrect format of {"exampleDate": 202222--01-01} or {"exampleDate": 2022/01/01}
Then the error message is
{
"type": "about:blank",
"parameters": {
"path": "/project"
},
"status": 400,
"detail": "Required argument [fakeClass fakeClass] not specified"
}
Is there a simple way to provide more information to the error message to make it clear why the request failed for an invalid format or type like #NotNull or #NotBlank?
The problem here is not Micronaut but your payloads. The examples you mentioned are invalid JSON documents.
For example this on here is invalid, since the value is not a number nor a string.
{
"exampleDate": 202222--01-01
}
this would be the a valid variant
{
"exampleDate": "202222--01-01"
}
Make sure you send the date as a String. In your case this is expected to be valid.
{
"exampleDate": "2022-11-01"
}
In general it is recommended to send date using the ISO-8601 format, which you did (yyyy-MM-dd). Furthermore I recommend to apply a global configuration rather than using on each POJO a #Format("yyyy-MM-dd") annotation.
jackson:
dateFormat: yyyyMMdd
timeZone: UTC
serializationInclusion: NON_NULL
serialization:
writeDatesAsTimestamps: false
#Format("yyyy-MM-dd") is a formatter not a Constraint.
You can use #Pattern(<regex>). There is also date specific ones like #Past, #PastOrPresent, #Futureand #FutureOrPresent.
I am using lighthouse-php as Api Gateway in a micro services architecture.
So for all my types I make a request internally through Guzzle.
But I am needing to implement filters that are suitable for any type and that give flexibility when making queries.
I need to implement a query like this:
query news (
order_by: {publication_date: desc}
where: {
_or: {categories_id: { _eq: 1 }, title: { _ilike: "news" } }
}
limit: 10
offset: 20
) {
id
category_name: name
photo
publication_date
text
title
}
But I have no idea how to implement this "where" filter that receives a composite object as in this example.
Remember that this query will not use any model within lumen, since it will be a custom query that will make a request to the microservice of news.
What I need is the way that my query receives whatever comes in where, limit and order, to send it on request. But I have no idea how to build something like this in the scheme.
Anyone have any idea how to do it?
Thanks friends.
Yes, you can.
Just now I'm making an component that will receive criterias to filter in graphql query so I need to fill filter's where params with those criterias.
Imagine the following schema:
type News{
id: ID!
title: String!
views: Int!
}
type Query{
getNews(where: _ #whereConditions(columns:["title", "views"])) : [News!] #all
}
We can make a query and fill where variables later
query GetNews($whereNews: [GetNewsWhereWhereConditions!]){
getNews(where: {OR: $whereNews}){
title
views
}
}
When querying we can fill the variables sending an object like
{
"where":[
{"column": "TITLE", "operator": "LIKE", "value": "Amazing title"},
{"column": "VIEWS", "operator": "GTE", "value": 10,
]
}
To stub http response I use WireMock.
So here my stubbed response as json file.
Location: /wiremock/__files/myproject/stub.resp.json
Content of stub.resp.json
{
"requestId": "903004f5-7033-4aa8-a605-a10d4ff19241",
"Code": 0,
"Text": "Success",
"data": {
"request_id": "a12c6161-463b-e911-85dc-c81f66ca042a",
"paid_currency_code": "USD",
"transfer_amount": 1.0,
"transfer_currency_code": "USD",
"paid_amount": 1.0,
"exchange_rate": 1.0,
"referenceNumber": "123456",
"receiverName": "Bruce Lee",
"receiveDate": "2019-02-28T12:48:00"
}
}
Nice. It's work fine.
But I have one question. As you can see the field receiveDate is hardcoded date-time (always 2019-02-28T12:48:00). But I need every time when return this stub response, in the field receiveDate to generate current date.
How I can do this?
And I need to generate current date in format "yyyy-MM-ddTHH:mm:ss"
You should be able to put something like this into your JSON response body:
"receiveDate": "{{now format='yyyy-MM-dd HH:mm:ssZ'}}"
For referecence: http://wiremock.org/docs/response-templating/, specifically the section under the heading: "Date and time helpers".
My purpose is to make a subscription so that accumulator server from the Orion's test package receives notifications when attribute's value exceeds a treshold. If I am correct this is not implemented on NGSI v1. So on NGSI v2 when I use the above subscription payload with the suitable Service and Subservice Headers
{
"description":"mydescription",
"subject":{
"entities":[
{
"id":"room1",
"type":"room",
"isPattern":"false"
}
],
"condition":{
"attrs":[
"temperature"
],
"expression":{
"q":"temperature>5"
}
}
},
"notification":{
"http":{
"url":"http://myURL:1028/accumulate"
},
"attrs":[
]
},
"expires":"2040-01
-01T14:00:00.00Z"
}
I don't receive any notifications on accumulator server. Without the expression I receive notifications on first place when i make the subscription and also every time that the attribute's value is changed.
Orion version: 1.7.0
I have also tried the solution with noCache for subscriptions on Context Broker.
EDIT: When I query the context for room1
curl -X GET localhost:1026/v2/entities/room1 -H "Fiware-Service: myService" -H "Fiware-ServicePath: /mySubService"
this is the reply from Orion.
{
"id":"room1",
"type":"room",
"TimeInstant":{
"type":"ISO8601",
"value":"2017-05-15T13:33:35.632Z",
"metadata":{
}
},
"temperature":{
"type":"float",
"value":"6",
"metadata":{
"TimeInstant":{
"type":"ISO8601",
"value":"2017-05-15T13:33:35.632Z"
}
}
}
}
Note that your temperature is a string ("6") and not a number. In order the filter to work it should be a number, i.e. you have to get:
{
..
"temperature":{
"type": "float",
"value": 6,
..
}
Note that the NGSIv1 API doesn't allow to create/update attributes with JSON native types other than strings (a more detailed explanation can be found in this presentation, "Native JSON datatypes" slides) If you attemp to create/update temperature as a number using NGSIv1 operations, it will be casted to string.
Thus you have to use the NGSIv2 API (which doesn't have such limitation) in order to create/update attributes with numeric values. For instance, the following request will update temperature value to the (numeric) value 6:
PUT /v2/entities/room1/attrs/temperature
{
"type": "float",
"value": 6
}
I want to support pagination in my RESTful API.
My API method should return a JSON list of product via /products/index. However, there are potentially thousands of products, and I want to page through them, so my request should look something like this:
/products/index?page_number=5&page_size=20
But what does my JSON response need to look like? Would API consumers typically expect pagination meta data in the response? Or is only an array of products necessary? Why?
It looks like Twitter's API includes meta data: https://dev.twitter.com/docs/api/1/get/lists/members (see Example Request).
With meta data:
{
"page_number": 5,
"page_size": 20,
"total_record_count": 521,
"records": [
{
"id": 1,
"name": "Widget #1"
},
{
"id": 2,
"name": "Widget #2"
},
{
"id": 3,
"name": "Widget #3"
}
]
}
Just an array of products (no meta data):
[
{
"id": 1,
"name": "Widget #1"
},
{
"id": 2,
"name": "Widget #2"
},
{
"id": 3,
"name": "Widget #3"
}
]
ReSTful APIs are consumed primarily by other systems, which is why I put paging data in the response headers. However, some API consumers may not have direct access to the response headers, or may be building a UX over your API, so providing a way to retrieve (on demand) the metadata in the JSON response is a plus.
I believe your implementation should include machine-readable metadata as a default, and human-readable metadata when requested. The human-readable metadata could be returned with every request if you like or, preferably, on-demand via a query parameter, such as include=metadata or include_metadata=true.
In your particular scenario, I would include the URI for each product with the record. This makes it easy for the API consumer to create links to the individual products. I would also set some reasonable expectations as per the limits of my paging requests. Implementing and documenting default settings for page size is an acceptable practice. For example, GitHub's API sets the default page size to 30 records with a maximum of 100, plus sets a rate limit on the number of times you can query the API. If your API has a default page size, then the query string can just specify the page index.
In the human-readable scenario, when navigating to /products?page=5&per_page=20&include=metadata, the response could be:
{
"_metadata":
{
"page": 5,
"per_page": 20,
"page_count": 20,
"total_count": 521,
"Links": [
{"self": "/products?page=5&per_page=20"},
{"first": "/products?page=0&per_page=20"},
{"previous": "/products?page=4&per_page=20"},
{"next": "/products?page=6&per_page=20"},
{"last": "/products?page=26&per_page=20"},
]
},
"records": [
{
"id": 1,
"name": "Widget #1",
"uri": "/products/1"
},
{
"id": 2,
"name": "Widget #2",
"uri": "/products/2"
},
{
"id": 3,
"name": "Widget #3",
"uri": "/products/3"
}
]
}
For machine-readable metadata, I would add Link headers to the response:
Link: </products?page=5&perPage=20>;rel=self,</products?page=0&perPage=20>;rel=first,</products?page=4&perPage=20>;rel=previous,</products?page=6&perPage=20>;rel=next,</products?page=26&perPage=20>;rel=last
(the Link header value should be urlencoded)
...and possibly a custom total-count response header, if you so choose:
total-count: 521
The other paging data revealed in the human-centric metadata might be superfluous for machine-centric metadata, as the link headers let me know which page I am on and the number per page, and I can quickly retrieve the number of records in the array. Therefore, I would probably only create a header for the total count. You can always change your mind later and add more metadata.
As an aside, you may notice I removed /index from your URI. A generally accepted convention is to have your ReST endpoint expose collections. Having /index at the end muddies that up slightly.
These are just a few things I like to have when consuming/creating an API.
I would recommend adding headers for the same. Moving metadata to headers helps in getting rid of envelops like result , data or records and response body only contains the data we need. You can use Link header if you generate pagination links too.
HTTP/1.1 200
Pagination-Count: 100
Pagination-Page: 5
Pagination-Limit: 20
Content-Type: application/json
[
{
"id": 10,
"name": "shirt",
"color": "red",
"price": "$23"
},
{
"id": 11,
"name": "shirt",
"color": "blue",
"price": "$25"
}
]
For details refer to:
https://github.com/adnan-kamili/rest-api-response-format
For swagger file:
https://github.com/adnan-kamili/swagger-response-template
As someone who has written several libraries for consuming REST services, let me give you the client perspective on why I think wrapping the result in metadata is the way to go:
Without the total count, how can the client know that it has not yet received everything there is and should continue paging through the result set? In a UI that didn't perform look ahead to the next page, in the worst case this might be represented as a Next/More link that didn't actually fetch any more data.
Including metadata in the response allows the client to track less state. Now I don't have to match up my REST request with the response, as the response contains the metadata necessary to reconstruct the request state (in this case the cursor into the dataset).
If the state is part of the response, I can perform multiple requests into the same dataset simultaneously, and I can handle the requests in any order they happen to arrive in which is not necessarily the order I made the requests in.
And a suggestion: Like the Twitter API, you should replace the page_number with a straight index/cursor. The reason is, the API allows the client to set the page size per-request. Is the returned page_number the number of pages the client has requested so far, or the number of the page given the last used page_size (almost certainly the later, but why not avoid such ambiguity altogether)?
just add in your backend API new property's into response body.
from example .net core:
[Authorize]
[HttpGet]
public async Task<IActionResult> GetUsers([FromQuery]UserParams userParams)
{
var users = await _repo.GetUsers(userParams);
var usersToReturn = _mapper.Map<IEnumerable<UserForListDto>>(users);
// create new object and add into it total count param etc
var UsersListResult = new
{
usersToReturn,
currentPage = users.CurrentPage,
pageSize = users.PageSize,
totalCount = users.TotalCount,
totalPages = users.TotalPages
};
return Ok(UsersListResult);
}
In body response it look like this
{
"usersToReturn": [
{
"userId": 1,
"username": "nancycaldwell#conjurica.com",
"firstName": "Joann",
"lastName": "Wilson",
"city": "Armstrong",
"phoneNumber": "+1 (893) 515-2172"
},
{
"userId": 2,
"username": "zelmasheppard#conjurica.com",
"firstName": "Booth",
"lastName": "Drake",
"city": "Franks",
"phoneNumber": "+1 (800) 493-2168"
}
],
// metadata to pars in client side
"currentPage": 1,
"pageSize": 2,
"totalCount": 87,
"totalPages": 44
}
This is an interessting question and may be perceived with different arguments. As per the general standard meta related data should be communicated in the response headers e.g. MIME type and HTTP codes. However, the tendency I seem to have observed is that information related to counts and pagination typically are communicated at the top of the response body. Just to provide an example of this The New York Times REST API communicate the count at the top of the response body (https://developer.nytimes.com/apis).
The question for me is wheter or not to comply with the general norms or adopt and do a response message construction that "fits the purpose" so to speak. You can argue for both and providers do this differently, so I believe it comes down to what makes sense in your particular context.
As a general recommendation ALL meta data should be communicated in the headers. For the same reason I have upvoted the suggested answer from #adnan kamili.
However, it is not "wrong" to included some sort of meta related information such as counts or pagination in the body.
generally, I make by simple way, whatever, I create a restAPI endpoint for example "localhost/api/method/:lastIdObtained/:countDateToReturn"
with theses parameters, you can do it a simple request.
in the service, eg. .net
jsonData function(lastIdObtained,countDatetoReturn){
'... write your code as you wish..'
and into select query make a filter
select top countDatetoreturn tt.id,tt.desc
from tbANyThing tt
where id > lastIdObtained
order by id
}
In Ionic, when I scroll from bottom to top, I pass the zero value, when I get the answer, I set the value of the last id obtained, and when I slide from top to bottom, I pass the last registration id I got