writing to an existing item within a C++ model to update QML listview

[saitej]

Hi

I am using a similar model as described here. I need to update the value of an existing item . So i guess i need to setdata() and then emit datachanged() signal (please do correct me if I am wrong!!). Can someone guide me how to write the setdata() function.

This is what I have written:

I need to change only the size values so I have added a setdata() in the Animal class also.

Function I have added to Animal class:*

void Animal::setData(const QString size, int role){
       if(role == AnimalModel::SizeRole)
        setsize(size);
    else
        return;
}


void Animal::  setsize(const QString size){

              if(QString::compare(size,m_size,Qt::CaseInsensitive))
                       return;
    m_size = size;
}

void AnimalModel::setdata(const QModelIndex &index,const QString &type,const QString &size){

Q_UNUSED(type)
if (index.row() < 0 || index.row() >= m_animals.count())
               return;

m_animals.at(index.row()).setData(size,role);

}

I get the error in this line :

error: passing 'const Animal' as 'this' argument of 'void Animal::setData(QString, int)' discards qualifiers [-fpermissive]
m_animals.at(index.row()).setData(value,role);
^

[Vicky Sharma]

@saitej
You may refer this post to understand this error happening.

http://stackoverflow.com/questions/5973427/error-passing-xxx-as-this-argument-of-xxx-discards-qualifiers