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How to convert non HAL format to HAL format for nested entity

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0

There is a model class "Student" which extends ResourceSupport and contains attributes name(string), age(int), marks(int) and class_leader(Student). I have defined two views , basicview (applied for name and age) and fullview (extends basic view and applied for marks and class_leader). When I call an api to get all students details with full view, I am expecting a full view for each student with basic view for the class leader of that student. To add that facility , I have incorporated JSONSerializer for class_leader attribute and its working as expected. But the only problem which I face now is for the class_leader the Link is not coming in HAL format. If I am not using serializer fullview with proper HAL format is getting displayed.

Have tried annotating controller class with @EnableHypermediaSupport(type = [(EnableHypermediaSupport.HypermediaType.HAL)])

This is the serializer code which I am using.

class StudentSerializer: JsonSerializer<Any>() 

 @Throws(IOException::class, JsonGenerationException::class)
 override fun serialize(value: Any?, jgen: JsonGenerator?, provider: 
 SerializerProvider?) 
 var objectMapper = jacksonObjectMapper()
 objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
 //objectMapper.registerModule( Jackson2HalModule())
 objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value)
 

Expected Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/2"
 
 
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 


Actual Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "links": [
 
 "rel": "self",
 "href":"http://localhost:9090/class/students/2"
 
 ]
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 

spring-boot kotlin spring-hateoas

share|improve this question

asked Mar 24 at 6:53

DeepnaDeepna

301

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got it working : ` override fun serialize(value: Any?, jgen: JsonGenerator?, provider: SerializerProvider?) var objectMapper = jacksonObjectMapper() objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL) objectMapper.registerModule( Jackson2HalModule()) objectMapper.setHandlerInstantiator( Jackson2HalModule.HalHandlerInstantiator(AnnotationRelProvider(), null, null, HalConfiguration())) objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value) `
  
  – Deepna
  Mar 26 at 7:10
  
  

  
  
  
  

add a comment | 

0

There is a model class "Student" which extends ResourceSupport and contains attributes name(string), age(int), marks(int) and class_leader(Student). I have defined two views , basicview (applied for name and age) and fullview (extends basic view and applied for marks and class_leader). When I call an api to get all students details with full view, I am expecting a full view for each student with basic view for the class leader of that student. To add that facility , I have incorporated JSONSerializer for class_leader attribute and its working as expected. But the only problem which I face now is for the class_leader the Link is not coming in HAL format. If I am not using serializer fullview with proper HAL format is getting displayed.

Have tried annotating controller class with @EnableHypermediaSupport(type = [(EnableHypermediaSupport.HypermediaType.HAL)])

This is the serializer code which I am using.

class StudentSerializer: JsonSerializer<Any>() 

 @Throws(IOException::class, JsonGenerationException::class)
 override fun serialize(value: Any?, jgen: JsonGenerator?, provider: 
 SerializerProvider?) 
 var objectMapper = jacksonObjectMapper()
 objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
 //objectMapper.registerModule( Jackson2HalModule())
 objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value)
 

Expected Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/2"
 
 
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 


Actual Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "links": [
 
 "rel": "self",
 "href":"http://localhost:9090/class/students/2"
 
 ]
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 

spring-boot kotlin spring-hateoas

share|improve this question

asked Mar 24 at 6:53

DeepnaDeepna

301

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got it working : ` override fun serialize(value: Any?, jgen: JsonGenerator?, provider: SerializerProvider?) var objectMapper = jacksonObjectMapper() objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL) objectMapper.registerModule( Jackson2HalModule()) objectMapper.setHandlerInstantiator( Jackson2HalModule.HalHandlerInstantiator(AnnotationRelProvider(), null, null, HalConfiguration())) objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value) `
  
  – Deepna
  Mar 26 at 7:10
  
  

  
  
  
  

add a comment | 

There is a model class "Student" which extends ResourceSupport and contains attributes name(string), age(int), marks(int) and class_leader(Student). I have defined two views , basicview (applied for name and age) and fullview (extends basic view and applied for marks and class_leader). When I call an api to get all students details with full view, I am expecting a full view for each student with basic view for the class leader of that student. To add that facility , I have incorporated JSONSerializer for class_leader attribute and its working as expected. But the only problem which I face now is for the class_leader the Link is not coming in HAL format. If I am not using serializer fullview with proper HAL format is getting displayed.

Have tried annotating controller class with @EnableHypermediaSupport(type = [(EnableHypermediaSupport.HypermediaType.HAL)])

This is the serializer code which I am using.

class StudentSerializer: JsonSerializer<Any>() 

 @Throws(IOException::class, JsonGenerationException::class)
 override fun serialize(value: Any?, jgen: JsonGenerator?, provider: 
 SerializerProvider?) 
 var objectMapper = jacksonObjectMapper()
 objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
 //objectMapper.registerModule( Jackson2HalModule())
 objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value)
 

Expected Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/2"
 
 
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 


Actual Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "links": [
 
 "rel": "self",
 "href":"http://localhost:9090/class/students/2"
 
 ]
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 

spring-boot kotlin spring-hateoas

share|improve this question

asked Mar 24 at 6:53

DeepnaDeepna

301

class StudentSerializer: JsonSerializer<Any>() 

 @Throws(IOException::class, JsonGenerationException::class)
 override fun serialize(value: Any?, jgen: JsonGenerator?, provider: 
 SerializerProvider?) 
 var objectMapper = jacksonObjectMapper()
 objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
 //objectMapper.registerModule( Jackson2HalModule())
 objectMapper.writerWithView(Views.BaiscView :: class.java).writeValue(jgen, value)
 

Expected Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/2"
 
 
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 


Actual Result:


 "_embedded": 
 "studentList": [
 
 "roll_no":1,
 "name": "student1",
 "age": 10,
 "marks":47,
 "class_leader": 
 "roll_no":2,
 "name": "student2",
 "links": [
 
 "rel": "self",
 "href":"http://localhost:9090/class/students/2"
 
 ]
 , 
 "_links": 
 "studentdetail": 
 "href": "http://localhost:9090/class/students/1"
 
 
 ,
 ...
 ]
 ,
 "_links": 
 "self": 
 "href": "http://localhost:9090/class/students/"
 
 

share|improve this question

asked Mar 24 at 6:53

DeepnaDeepna

301

share|improve this question

asked Mar 24 at 6:53

DeepnaDeepna

301

asked Mar 24 at 6:53

DeepnaDeepna

301

asked Mar 24 at 6:53

DeepnaDeepna

301