thinkphp 3.2 View model query out BOOL (FALSE) solution

thinkphp 3.2 View model query out bool (false) solve
It's written in this model.

 
  namespace Home\model;
Use Think\model\viewmodel;
Class Picviewmodel extends  viewmodel{
    Public $viewFields =array (
       ' Picture ' = = Array (' Pictitle ', ' pictoken ', ' Piccategroy ', ' picauthor ', ' picposttime ', ' _type ' = ' left '),
        ' Picture_attachment ' =>array (' Pictureid ', ' pictureurl ', ' creattime ', ' _on ' = ' picture.pictoken ' = picture_ Attachment.pictureid '),

    );
}

Picture and picture_attachment two tables
That's what the controller says. I instantiate Picview with the D method. Is this the real table name that must be in the database?

    Public Function  Pic () {
         $PicModel =d (' Picview ');

        Dump ($PicModel);
         $s =   $PicModel->select ();
        Dump ($s);

    }

Some of the errors returned
["DB":p rotected] + object (think\db\driver\mysql) #8 (19) {
["DbType":p rotected] = NULL
["Autofree":p rotected] = bool (false)
["Model":p rotected] and string (7) "_think_"
["Pconnect":p rotected] = bool (false)
["Querystr":p rotected] = string (0) ""
["Modelsql":p rotected] = = Array (0) {
}
["Lastinsid":p rotected] = NULL
["NumRows":p rotected] = Int (0)
["Numcols":p rotected] = Int (0)
["Transtimes":p rotected] = Int (0)
["Error":p rotected] + string (0) ""
["LinkID":p rotected] = = Array (0) {
}
["_linkid":p rotected] = NULL
["Queryid":p rotected] = NULL
["Connected":p rotected] = bool (false)
["Autoinc":p rotected] = bool (false)
["Patchvalidate":p rotected] = bool (false)
------to solve the idea----------------------

# Picview Model initialization, if the Picview class exists, is called and initialized and, if not present, initializes the model based on the table name
         $PicModel =d (' Picview ');

The SQL statement that #输出所有数据 actually executes is
# SELECT * from Picview
         $s =   $PicModel->select ();

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