Wt - Example of QueryModel and WTableView? - c++

Question

I'm beginning with Wt, and after taking the basics of ORM module, I'm trying to show the results of a table (TableTags) with no success.
I have defined table TableTag as:
class TableTag
{
public:
static const unsigned int tableVersion = 1;
std::string name;
//Wt::Dbo::collection< Wt::Dbo::ptr<TablePost> > tablePosts;
TableTag();
~TableTag();
static void initTableRecords(Wt::Dbo::Session &_session);
template<class Action>
void persist(Action &_action)
{
Wt::Dbo::field(_action, name, "Name");
//Wt::Dbo::hasMany(_action, tablePosts, Wt::Dbo::ManyToMany, "Post");
}
};
typedef Wt::Dbo::collection< Wt::Dbo::ptr<TableTag> > TableTags;
and I'm begginning with a code similar to:
DDBBApp::setDDBBBackendAndSession(ddbbBackend_,ddbbSession_);
ddbbSession_.mapClass<TableTag>("TableTag");
{
Wt::Dbo::Transaction transaction(ddbbSession_);
Wt::Dbo::QueryModel<TableTag> * qmTags = new Wt::Dbo::QueryModel<TableTag>();
TableTags tags = ddbbSession_.find<TableTag>();
Wt::Dbo::Query<TableTag> qTag(ddbbSession_.find<TableTag>());
qmTags->setQuery(qTag);
WTableView * wtv = new WTableView();
wtv->setModel(qmTags);
}
but compiler complains with this error (VS2013, translated to English):
DDBBApp.cpp(54): error C2664:
'Wt::Dbo::Query::Query(Wt::Dbo::Session
&,const std::string &,const std::string &)' : argument 1 cannot be converted from 'Wt::Dbo::Query' to 'const
Wt::Dbo::Query &'
I've tried several constructors, variable types, etc... I know the point is close to this:
Wt::Dbo::QueryModel<TableTag> * qmTags = new Wt::Dbo::QueryModel<TableTag>();
Wt::Dbo::Query< Wt::Dbo::ptr<TableTag> > q1 = ddbbSession_.find<TableTag>();
qmTags->setQuery(qTag); //Error here
Wt::Dbo::Query<TableTag> q2 = ddbbSession_.find<TableTag>(); //Error here
qmTags->setQuery(q2);
But I'm not able to deal with this, I think the right way is 2nd one, according to the docu and snippets I've googled.
Can someone post a simple example so I can clarify how Wt works with this?
Wy the wall, I'm using Wt 3.3.3 under Win 8.1 + VS 2013.

Answer 1

Finally I figured it ^_^ thanks to: Not getting headers on WTableView with QueryModel
The rigth piece of code is as follows:
Wt::Dbo::QueryModel< Wt::Dbo::ptr<TableTag> > * qmTags1 = new Wt::Dbo::QueryModel< Wt::Dbo::ptr<TableTag> >();
qmTags1->setQuery(ddbbSession_.find<TableTag>());
qmTags1->addAllFieldsAsColumns();
WTableView * wtv1 = new WTableView();
wtv1->setModel(qmTags1);
this->root()->addWidget(wtv1);
Note: don't forget to use QueryModel->setQuery()!!