Grails : Could not set the value of parameter and kept on getting cannot be null

Question

Domain Class:

class Employee {
    .
    .
    Boolean syncFlag
    Date dateLastModified 
}

MySQL:

Column name              Data type                    Default value
---------------------------------------------------------------------                                                                                                                 
sync_flag                BIT(1)         Not Null      b'0'                                                                                                                                                                                                                                                                                                    

date_last_modified       TIMESTAMP      Not Null      CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

Controller:

def save() {      
       .
       .

    params.remove('id')

     if(params.dateLastModified){
        params.remove('dateLastModified')
     }

     if(params.syncFlag){
        params.remove('syncFlag')
     }

Hi, I've posted above all the necessary codes that might help you analyze what the problem was. Basically, the error is syncFlag and dateLastModified cannot be null. So what I did was removed these keys by using

params.remove('<column name>')

so that in the insert statement of hibernate these will be skipped and since I defined in MySQL that these should not be null, it will use the default value set. The problem is that I kept getting that same error (.... cannot be null). So what I did was set the default value of these in the domain class but it didn't works either. I also tried to hard code it like this:

params.syncFlag=false

but it also didn't works.

When print the value of those 2 fields, I get null even if I hard coded it already.

I think I've already made everything that I can to debug but all of it failed. Could you tell me what might have caused this and why I'm getting cannot be null?

Answer 1

Your domain class is set to not allow null properties. That's the Grails default. To allow nulls, use the nullable constraint .

class Employee {
    ...
    static constraints = {
        dateLastModified nullable: true
        syncFlag nullable: true
    }
}

Hint

To get a Map without certain keys you can follow this example:

def params = [
    id: 100,
    dateLastModified: new Date(),
    syncFlag: true,
    other: "This won't get filtered out"]

def ignore = ['id', 'dateLastModified', 'syncFlag']
assert params.findAll { key, value -> !(key in ignore) } == [other:"This won't get filtered out"]

You can filter them out with findAll() . Note that by filter I mean the original params remains unchanged.

Answer 2

You might actually think that this is weird but this fixed my problem.

Employee employeeInstance = new Employee(params);
employeeInstance.setSyncFlag(false);
employeeInstance.setDateLastModified(new Date());
employeeInstance.save(flush:true)

The issue is I had the hard time changing some of the value in params, and i dont know why. So what I did was, before I call save, I changed the value using the setters. And that worked.