I have one json file in my local path sendmail.json it contains data like this
{
"from": {
"datatype": "String",
"required": false
},
"subject": {
"datatype": "String",
"required": false
},
"text": {
"datatype": "String",
"required": false
},
"to": {
"datatype": "String",
"required": false
}
}
i want to deserialize this data in mvc and i want to pass this data to .js angular controller please provide the way how to do it.
If you want to deserialize JSON and sent it to the client side, you can do it like this.
[HttpGet]
public ActionResult mailData()
{
List<test> myDeserializedObjList = (List<test>)Newtonsoft.Json.JsonConvert.DeserializeObject(Request["jsonString"], typeof(List<test>));
return Json(jsonString, JsonRequestBehavior.AllowGet);
}
Hope it works for you..!
There is no need to deserialize the JSON into an object and then serialize the object into JSON to send it to the browser.
Why not send directly the JSON file to the browser?
public class MailController : Controller
{
// GET: Mail
public ActionResult Schema()
{
return File(this.Server.MapPath("~/App_Data/sendmail.json"), "application/json");
}
}
EDIT:
Anyway here you have what you asked for:
public class MailController : Controller
{
// GET: Mail
public ActionResult Schema()
{
using (var reader = new StreamReader(this.Server.MapPath("~/App_Data/sendmail.json")))
{
var json = reader.ReadToEnd();
var data = JsonConvert.DeserializeObject<Dictionary<string, PropertyDefinition>>(json);
return this.Json(data, JsonRequestBehavior.AllowGet);
}
}
}
public class PropertyDefinition
{
public string datatype;
public bool required;
}
It needs Newtonsoft.JSON nuget package
Related
How I get a list/elements in an Json. To get the input i use this:
enterJson(productName, expirydDate, stock, notifications) {
OverviewProduct overviewProduct =
OverviewProduct(productName, expirydDate, stock, notifications);
Map<String, dynamic> map = {
'Product_Name': overviewProduct.productName,
'Expiry_date': overviewProduct.expirydDate,
'Stock': overviewProduct.stock,
'Notifications': overviewProduct.notifications
};
String rawJson = jsonEncode(map);
print(rawJson);
}
Now, i get {"Product_Name":"Test","Expiry_date":"12","Stock":1,"Notifications":true}. This, I would now like to add this into a json file. The json file should have more or less this structure:
[
{
"Product_Name": "Pom-Bär Original",
"Expiry_date" : "10.05.21",
"Stock" : "1",
"Notifications" : "True"
},
{
"Product_Name": "Ja! Natürliches Mineralwasser",
"Expiry_date" : "23.11.21",
"Stock" : "1",
"Notifications" : "True"
}
]
instead of "enterJson" use below code in "OverviewProduct Class":
factory OverviewProduct.fromMap(Map<String, dynamic> map) {
return new OverviewProduct(
Product_Name: map['Product_Name'],
Expiry_date: map['Expiry_date'] ,
Stock: map['Stock'] ,
Notifications: map['Notifications']
);
}
and use it as this:
(map['Products']).map((p) => OverviewProduct.fromMap(p)).toList()
This is my second question in a few days about working with spring data rest and HATEOAS links.
tl;dr
How can my application use the link for 'manyToOne' attribute to populate the 'current value' for an html select drop down?
"Spring data rest" generated links behave differently than with "old school ids".
Context
Converting an app to spring JPA and spring data rest.
Simple 'product/category' table structure per below
I've added a projection name 'full' to 'join/get' descriptions
Tables
*Product*
---------
Product ID
Product Name
Category ID
*Category*
---------
Category ID
Category Name
Spring Data Rest Domain Objects
Product
#Entity
#Table(name="products")
public class Products
{
private static final long serialVersionUID = 5697367593400296932L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
public long id;
public String product_name;
#ManyToOne(optional = false,cascade= CascadeType.MERGE)
#JoinColumn(name = "category_id")
private ProductCategory productCategory;
public Products(){}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public Products(String product_name) {
this.product_name = product_name;
}
public String getProduct_name() {
return product_name;
}
public void setProduct_name(String product_name) {
this.product_name = product_name;
}
public ProductCategory getProductCategory()
{
return productCategory;
}
public void setProductCategory(ProductCategory pProductCategory)
{
productCategory = pProductCategory;
}
#Projection(name = "full", types = { Products.class })
interface VirtualProjection
{
String getProductName() ;
#Value("#{target.productCategory.category}")
String getCategory();
}
}
Product Category
#Entity
#Table(name="productcat")
public class ProductCategory implements Serializable{
private static final long serialVersionUID = 890485159724195243L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
public long id;
public String category;
#OneToMany(mappedBy = "productCategory", cascade = CascadeType.ALL)
#JsonBackReference
Set<Products> products;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public Set<Products> getProducts() {
return products;
}
}
Problem: Impedance Mismatch between list of Categories, value in object
When the angular client retrieves a product, the product 'category link' for the product category looks like this:
href" : "http://localhost:8080/api/rest/products/8/productCategory"
When the client retrieves a list of 'product categories', the link for the category looks like this:
href": "http://localhost:8080/api/rest/productcat/4"
Here's the "select" code. The UI will only show select if "product.productCategory" maches one of the value for 'options'.
<select ng-model="product.productCategory >
<option value="http://localhost:8080/api/rest/productcat/1">Foo Product Type
</option>
<option value="http://localhost:8080/api/rest/productcat/2">Bar Product Type
</option>
<option value="http://localhost:8080/api/rest/productcat/3">Baz Product Type
</option>
</select>
Question
How do I code my server API to make "generated links" client
friendly? What's the Springiest approach?
Should I change the API to receive, for update, "values" rather than "IDs/Links", i.e. the Category Name,rather than the ID? (i.e. and look up the category by name and update it on the server side)
What javascript/angular tools and techniques do you recommend for working with links?
I coded around the problem by 'de-referencing' the "productCategory" value via javascript,
- retrieving the URL in the "productCategory" attribute, e.g.:
http://localhost:8080/api/rest/products/8/productCategory
replacing the "productCategory" attribute/url with the values from the HATEOAS links.
pItem[pPropName] = data._links.self.href;
This approach brings a lot of complexity for a simple drop down. It doesn't smell right.
De-reference code
function dereferenceProperty(pItem,pPropName )
{
var myRef = pItem._links[pPropName];
if (myRef && myRef.href)
{
var myUrl = myRef.href;
$http.get(myUrl).success(function (data, status)
{
pItem[pPropName] = data._links.self.href;
});
}
}
Usage
dereferenceProperty(pProduct,"productCategory");
After this 'de-refrence':
Angular/Browser populated the drop down correctly
an HTTP PATCH update the API (and tables) correctly
I don't completely understand what do you mean, but if you need to get Product list within ProductCategory or you need to get implicitly ProductCategory within Product you can use, for example, projections:
#Projection(name = "withProducts", types = ProductCategory.class)
public interface WithProducts {
String getName();
Set<Product> getProducts();
}
#Projection(name = "withCategory", types = Product.class)
public interface WithCategory {
String getName();
BigDecimal getPrice();
ProductCategory getCategory();
}
Then if you GET http://localhost:8080/api/productCategories/1?projection=withProducts you retrieve something like this:
{
"_embedded": {
"products": [
{
"name": "Product1",
"category": {
"name": "Category1"
},
"price": 1,
"_links": {
"self": {
"href": "http://localhost:8080/api/products/1"
},
"product": {
"href": "http://localhost:8080/api/products/1{?projection}",
"templated": true
},
"category": {
"href": "http://localhost:8080/api/products/1/category"
}
}
},
{
"name": "Product2",
"category": {
"name": "Category1"
},
"price": 2,
"_links": {
"self": {
"href": "http://localhost:8080/api/products/2"
},
"product": {
"href": "http://localhost:8080/api/products/2{?projection}",
"templated": true
},
"category": {
"href": "http://localhost:8080/api/products/2/category"
}
}
}
]
},
"_links": {
"self": {
"href": "http://localhost:8080/api/productCategories/1/products?projection=withCategory"
}
}
}
Or if you GET http://localhost:8080/api/products/1/category?projection=withProducts you retrieve something like this:
{
"name": "Category1",
"products": [
{
"name": "Product1",
"price": 1
},
{
"name": "Product2",
"price": 2
}
],
"_links": {
"self": {
"href": "http://localhost:8080/api/productCategories/1"
},
"productCategory": {
"href": "http://localhost:8080/api/productCategories/1{?projection}",
"templated": true
},
"products": {
"href": "http://localhost:8080/api/productCategories/1/products"
}
}
}
Working example.
I have a Solr Schema and I am trying to do Facet Pivoting on it by passing multiple fields in facet.pivot parameter while making a call through SolrJ. My Solr response looks something like below:
"facet_pivot": {
"boolean_value,int_value": [
{
"field": "boolean_value",
"value": false,
"count": 1,
"pivot": [
{
"field": "int_value",
"value": 364,
"count": 1
}
]
},
{
"field": "boolean_value",
"value": true,
"count": 2,
"pivot": [
{
"field": "int_value",
"value": 406,
"count": 1
},
{
"field": "int_value",
"value": 409,
"count": 1
}
]
}
]
}
How, can I parse the above response using SolrJ in form of Nested objects i.e. PivotField having relation of which int_value falls under which boolean_value.
SolrJ Version tried: 4.10.4
Update:
When you make a call through SolrJ check the SolrQuery that gets generated. In my above case the SolrQuery was:
facet.pivot=boolean_value&facet.pivot=int_value
Solr considers above pivots as two different ones and you won't get nested pivoting. For Nested Pivoting your SolrQuery should have
facet.pivot=boolean_value,int_value
I had the same problem and wrote a simple tester application. It queries Solr and writes the pivot values to StdOut as hierarchical Strings. If there are any suggestions to implement that more nicely, please let me know. Here's the code:
public class Tester {
public static final String HIERARCHICAL_FACET_SEPARATOR = "/";
public static void main(String[] args) throws SolrServerException, IOException {
CloudSolrClient solr = ... ;
SolrQuery query = new SolrQuery(...);
query.setFacet(true);
query.addFacetPivotField(new String[]{"field1,field2,field3"});
QueryResponse result = solr.query(query);
NamedList<List<PivotField>> facetPivot = result.getFacetPivot();
List<String> parsedPivotResult = parsePivotResult(facetPivot);
parsedPivotResult.forEach((s) -> {
System.out.println(s);
});
}
private static List<String> parsePivotResult(final NamedList<List<PivotField>> pivotEntryList) {
final Set<String> outputItems = new HashSet<>();
for (final Entry<String, List<PivotField>> pivotEntry : pivotEntryList) {
System.out.println("Key: " + pivotEntry.getKey());
pivotEntry.getValue().forEach((pivotField) -> {
renderOutput(new StringBuilder(), pivotField, outputItems);
});
}
final List<String> output = new ArrayList<>(outputItems);
Collections.sort(output);
return output;
}
private static void renderOutput(final StringBuilder sb, final PivotField field, final Set<String> outputItems) {
final String fieldValue = field.getValue() != null ? ((String) field.getValue()).trim() : null;
final StringBuilder outputBuilder = new StringBuilder(sb);
if (field.getPivot() != null) {
if (outputBuilder.length() > 0) {
outputBuilder.append(HIERARCHICAL_FACET_SEPARATOR);
}
outputBuilder.append(fieldValue);
outputItems.add(new StringBuilder(outputBuilder).append(" (").append(field.getCount()).append(")").toString());
field.getPivot().forEach((subField) -> {
renderOutput(outputBuilder, subField, outputItems);
});
} else {
if (outputBuilder.length() > 0) {
outputBuilder.append(HIERARCHICAL_FACET_SEPARATOR);
}
outputBuilder.append(fieldValue);
outputItems.add(outputBuilder.append(" (").append(field.getCount()).append(")").toString());
}
}
}
I would like to include stuctured data as a parameter to my HTTP GET call and think I have it set up correctly, but my API is not receiving the data as I expected. How do I set up both sides to communicate the structured data?
My angular application is asking a complicated question to the REST API written in Web API 2.
The controller method is defined as:
[RoutePrefix("v1/questions")]
public class VersionsController : ApiController
{
[Route("askComplicated")]
[HttpGet]
[ResponseType(typeof(ComplicatedResponseDto))]
public IHttpActionResult AskComplicatedQuestion(ComplicatedRequestDto complicatedRequest)
{
var responseElements = new List<ComplicatedResponseElementDto>();
foreach (var requestElement in complicatedRequest.Elements)
{
responseElements.Add(new ComplicatedResponseElementDto()
{
Id = requestElement.Id,
answer = "it is unknowable!!!"
});
}
return Ok(new ComplicatedResponseDto() { Elements = responseElements.ToArray()});
}
The DTOs:
public class ComplicatedRequestDto
{
public ComplicatedRequestElementDto[] Elements { get; set; }
}
public class ComplicatedRequestElementDto
{
public int Id { get; set; }
public string Question { get; set; }
}
public class ComplicatedResponseDto
{
public ComplicatedResponseElementDto[] Elements { get; set; }
}
public class ComplicatedResponseElementDto
{
public int Id { get; set; }
public string Answer { get; set; }
}
I broke it down this way because I like a simple request and a simple response. I'm adopting the patterns that worked best for my past WCF work (and understand that might be my problem here).
From the angular side, here is my code:
var request = $http({
method: "get",
url: "http://localhost:65520/v1/questions/askComplicated",
data: {
complicatedRequest : {
elements: [
{ id: 2, question: 'what is the meaning of life?' },
{ id: 3, question: 'why am I here?' },
{ id: 4, question: 'what stock should I pick?' }
]
}
}
});
return request.then(handleSuccess, handleError);
When I call the REST API from my angular application, the WEB API 2 application receives it, but the ComplicatedRequestDto is null. How do I properly send that data so it will go through?
Update your API from Get to Post, because when we want to pass complex object it contains more data and we have restrictions to send maximum characters in URL.
Do below modifications:
[RoutePrefix("v1/questions")]
public class VersionsController : ApiController
{
[Route("askComplicated")]
[HttpPost]
[ResponseType(typeof(ComplicatedResponseDto))]
public IHttpActionResult AskComplicatedQuestion([FromBody]ComplicatedRequestDto complicatedRequest)
{
//write ur code here...
}
}
Update your js code as below:
var request = $http({
method: "post",
url: "http://localhost:65520/v1/questions/askComplicated",
data: {
complicatedRequest : {
elements: [
{ id: 2, question: 'what is the meaning of life?' },
{ id: 3, question: 'why am I here?' },
{ id: 4, question: 'what stock should I pick?' }
]
},
}
});
return request.then(handleSuccess, handleError);
You should add [FromUri] anotation before the method parameter to inform WebAPI that you want to load this parameter from the application Uri, and this is where your data goes when you use GET http action with data parameter.
So your code should look like this
[RoutePrefix("v1/questions")]
public class VersionsController : ApiController
{
[Route("askComplicated")]
[HttpGet]
[ResponseType(typeof(ComplicatedResponseDto))]
public IHttpActionResult AskComplicatedQuestion([FromUri]ComplicatedRequestDto complicatedRequest)
{
var responseElements = new List<ComplicatedResponseElementDto>();
foreach (var requestElement in complicatedRequest.Elements)
{
responseElements.Add(new ComplicatedResponseElementDto()
{
Id = requestElement.Id,
answer = "it is unknowable!!!"
});
}
return Ok(new ComplicatedResponseDto() { Elements = responseElements.ToArray()});
}
You also have to correct the payload to match stucture of your classes.
The corect value should look like this:
{
"Elements": [
{
"Id": 1,
"Question": "sample string 2"
},
{
"Id": 1,
"Question": "sample string 2"
}
]
}
And finally to provide the JavaScript code example it will be like (I only have jQuery, but payload will be the same for Angular):
$.ajax({url:"/v1/questions/askComplicated",data: {
"Elements": [
{
"Id": 2,
"Question": "what is the meaning of life?"
},
{
"Id": 3,
"Question": "why am I here?"
}
]
}})
I would like to create an array with JSON-Builder.
Expected format:
{
"Header": {
"SomeKey" : "SomeValue"
}
"Data": [
{
"SomeKey" : "SomeValue"
},
{
"SomeKey" : "SomeValue"
}
]
}
My Code:
def builder = new groovy.json.JsonBuilder()
def root = builder {
Header {
"Typ" "update"
"Code" "UTF-8"
"TransaktionsNr" item.transactionNumber
"DatumZeit" new Date().format("dd.MM.yyyy HH:mm")
}
customers.each ({ customer->
"Data" {
"Email" customer.code
"Newsletter" customer.newsletterSubscribed
}
})
However whatever I do I only get one element in the Data section. I tried using [] instead of {}, but I still only get one element, what am I doing wrong?
That's duplicate key for JSON structure. There should not be duplicate key in the same hierarchy or they will override each other:
class Customer { String code; boolean newsletterSubscribed }
customers = [
new Customer(code:"11111", newsletterSubscribed:true),
new Customer(code:"22222", newsletterSubscribed:false)
]
def builder = new groovy.json.JsonBuilder()
def root = builder {
Header {
"Typ" "update"
"Code" "UTF-8"
"TransaktionsNr" 987
"DatumZeit" new Date().format("dd.MM.yyyy HH:mm")
}
customers customers.collect { customer ->
["Email":customer.code,
"Newsletter":customer.newsletterSubscribed]
}
}
assert builder.toString() == {"Header":{"Typ":"update","Code":"UTF-8","TransaktionsNr":987,"DatumZeit":"21.12.2012 13:38"},"Data":{"Email":"22222","Newsletter":false},"customers":[{"Email":"11111","Newsletter":true},{"Email":"22222","Newsletter":false}]}