Question

Having trouble with Grails Domain Classes. I am overriding the constructor to build the domain class object from a net.sf.json.JSONObject. This works fine when I insantiate an object via a controller. Then I tried to instantiate it via a test case, and got an exception:

No signature of method: profileplugin.Contact.addToEmails() is applicable for argument types: (java.lang.String) values: [[e-mail]]

I should also point out that this seems to work with some classes, but not others. Very frustrating — I’m new to Grails, so if anyone can point me in the right direction, I’d appreciate it very much.

Here’s my domain class code.

package profileplugin

import net.sf.json.JSONObject

class Contact
{
    static hasMany =
    [
        phones: String,
        faxes: String,
        emails: String,
        websites: String,
    ];

    Contact() {};  // standard constructor must be specified, or grails dies
    Contact(JSONObject source)
    {
        source.get('emails').each()         { this.addToEmails(it);   };
        source.get('websites').each()       { this.addToWebsites(it); };
        source.get('phones').each()         { this.addToPhones(it);   };
        source.get('faxes').each()          { this.addToFaxes(it);    };
    };

}

And here’s an example source JSON string …

[
    addresses:[], 
    phones:["[phone]"], 
    faxes:[], 
    emails:["[e-mail]"], 
    websites:["http://www.google.com"]
]

And, finally, here’s the version of the code that worked (after getting feedback below):

class Contact
{
    def phones = [];
    def faxes = [];
    def emails = [];
    def websites = [];

    Contact() {};  // standard constructor must be specified, or grails dies
    Contact(JSONObject source)
    {
        print source;

        source.get('phones').each()         { this.phones.add(it);   };
        source.get('emails').each()         { this.emails.add(it);   };
        source.get('websites').each()       { this.websites.add(it); };
        source.get('faxes').each()          { this.faxes.add(it);    };
    };

}

Answer 1

Check your source code, you should not have a , at the end of your websites: String, I am surprised it did compile.

There is nosense to put hasMany relationship for a String class (unless you want to make database transaction on it then it is better to create domain classes for phones, faxes, emails and websites). You should rewrite this way:

package profileplugin

import net.sf.json.JSONObject

class Contact
{

    String[] phones=new String[]
    String[] faxes=new String[]
    String[] emails=new String[]
    String[] websites=new String[]

    ...

}

and then use:

this.emails.add(it)

Also and probably more importantly, you SHOULD NOT add business logic inside your domain class, it should be inside your controller, service or in some external classes (under src directory).

EDIT:
actually it does not compile properly, the right syntax is:

def emails = []
etc...

thanks to ben