You have a problem with the function itself. This function is designed to format the data in the client, not to get more that from the server. If you need more data to format it correctly you will need to find the correct function to load all the data from the server and call the format function once all data is the client.

About the Deffered idea, it works, but it doesnt work. Looks like you dont understand them either. The return you have in the "then" function is not the return of the "_format" function. In your code the "_format" function don't have  a return value.

As i said it work, if you console.log(Qweb....) it will print, but not place in the document.

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Below Code May Help You

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_format: function (row_data, options) {

this.session = session;

if (!row_data[this.id] || !row_data[this.id].value) {

return '';

}

var self = this;

var call_done = $.Deferred();

var arraygiven = [];

new model('sale.order.line').query(['order_id']).filter([['product_id', '=', row_data[this.id].value]]).all().then(function (records) {

for(var i = 0, len = records.length; i < len; i++){

arraygiven.push(records[i].order_id[1]);

}

call_done.resolve(arraygiven);

});

call_done.then(function (values) {

console.log(values); // YOUR VALUES(arraygiven) ARE COME HERE

return QWeb.render('producthistorylist', {widget: self, saleorderlinenum: values});

});

}