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Spring form submit validation for foreign key

General Tech Technology & Software 2 years ago

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Posted on 16 Aug 2022, this text provides information on Technology & Software related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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manpreet Tuteehub forum best answer Best Answer 2 years ago

 

My project is a spring mvc project.In my project i have a domain Technology which has foreign key reference.When i validating on form submit it threw error....For view part(jsp),i using form:select for viewing department in technology. How can i validate a foreign reference????? i tried below code

domain

@Entity
@Table(name = "technology")
public class Technology {
private int id;
@NotEmpty
private String name;
@NotEmpty
private Department department;
private Date createdDate;
private boolean isDelete;
}

message.properties

NotEmpty.technology.department=Required!

Technology.jsp

 method="post" action="add-technology"
            commandName="technology" id="technologyForm">

            Technology Name
             path="name" />errors path="name" class="error">errors>
             />
            Department
             path="department.id">

                 value="0" label="Select" />

                 items="${departments}" itemValue="id" itemLabel="name" />

            errors path="department" class="error">errors>
            <%--    <form:select path="department.id" items="${departments}" /> --%>
             type="submit" class="btn btn-primary"/>

controller

@RequestMapping(value = "/add-technology")
public String addTechnology(
        @ModelAttribute(value = "technology")@Valid Technology technology,
        BindingResult result) {
    if(result.hasErrors()){
        return "/secure/admin/technology";
    }
    java.util.Date utilDate = new java.util.Date();
    Date sqlDate = new Date(utilDate.getTime());
    technology.setCreatedDate(sqlDate);

    technologyService.saveTechnology(technology);
    return "redirect:/technologies";
}

ERROR

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manpreet 2 years ago

Here you have to implement validator for Technology object

class TechnologyValidator extends Validator {

    public boolean supports(Class cls) {
        return Technology .class.equals(cls);
    }

    public void validate(Object target, Errors errors) {
        super.validate(target, errors);
        Technology tecObj= (Technology ) target;
        //here i am assuming Technology name is REQUIRED and   
        //NotEmpty.technology.name is in message.properties
       ValidationUtils.rejectIfEmptyOrWhitespace(errors,"name",
                                           "NotEmpty.technology.name");


      Department dept = tecObj.getDepartment();
      //as from from your are binding department ID
      if (dept==null || dept.getId()==null || dept.getId()==0L ) {
         errors.rejectValue("department.id", "NotEmpty.technology.department");
      }
  }
}

And create bean of this class in Spring-context

@Autowired
TechnologyValidator techValid;

And call this validator in your controller like

@RequestMapping(value = "/add-technology")
public String addTechnology(
        @ModelAttribute(value = "technology") Technology technology,
        BindingResult result) {

    //call validator
    techValid.validate(technology, result);

    if(result.hasErrors()){
        return "/secure/admin/technology";
    }
    java.util.Date utilDate = new java.util.Date();
    Date sqlDate = new Date(utilDate.getTime());
    technology.setCreatedDate(sqlDate);

    technologyService.saveTechnology(technology);
    return "redirect:/technologies";
}

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manpreet 2 years ago

Here you have to implement validator for Technology object

class TechnologyValidator extends Validator {

    public boolean supports(Class cls) {
        return Technology .class.equals(cls);
    }

    public void validate(Object target, Errors errors) {
        super.validate(target, errors);
        Technology tecObj= (Technology ) target;
        //here i am assuming Technology name is REQUIRED and   
        //NotEmpty.technology.name is in message.properties
       ValidationUtils.rejectIfEmptyOrWhitespace(errors,"name",
                                           "NotEmpty.technology.name");


      Department dept = tecObj.getDepartment();
      //as from from your are binding department ID
      if (dept==null || dept.getId()==null || dept.getId()==0L ) {
         errors.rejectValue("department.id", "NotEmpty.technology.department");
      }
  }
}

And create bean of this class in Spring-context

@Autowired
TechnologyValidator techValid;

And call this validator in your controller like

@RequestMapping(value = "/add-technology")
public String addTechnology(
        @ModelAttribute(value = "technology") Technology technology,
        BindingResult result) {

    //call validator
    techValid.validate(technology, result);

    if(result.hasErrors()){
        return "/secure/admin/technology";
    }
    java.util.Date utilDate = new java.util.Date();
    Date sqlDate = new Date(utilDate.getTime());
    technology.setCreatedDate(sqlDate);

    technologyService.saveTechnology(technology);
    return "redirect:/technologies";
}

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