model

问题 Setup using a simple example: I've got 1 table ( Totals ) that holds the sum of the amount column of each record in a second table ( Things ). When a thing.amount gets updated, I'd like to simply add the difference between the old value and the new value to total.sum . Right now I'm subtracting self.amount during before_update and adding self.amount during after_update . This places WAY too much trust in the update succeeding. Constraint: I don't want to simply recalculate the sum of all the

问题 I have the following method: private void passStingR(StringBuilder retVal) throws BadLocationException { int scrollPositionR = scrollR.getVerticalScrollBar().getValue();//get value of scroll position stores in javas memory windowR.remove(scrollR); tableR.getModel(); modelR.setRowCount(0); Document docR = null; try { docR = loadXMLFromString(retVal.toString());//pull in the XML data into a new doc } catch (Exception ex) { Logger.getLogger(remit.class.getName()).log(Level.SEVERE, null, ex); }

问题 I'm trying to build a model that dynamically updates Session variables in a Meteor project. I know that plain JSON should not be stored within backbone models, so I have a Special model set up like so: initialize : function () { // Log the changed properties this.on('change', function (model, options) { for ( var i in options.changes) this.display(i); Session.set('NewSpecial', model); }); }, //Attributes defaults: { "Product" : null, "ShortDescription" : null, "Category" : "food", "Price" :

问题 Heres the problem... I Have an app in the app store, which uses core data... I have been updating my model correctly (using versions etc) but Just recently I have accidentally lost my latest model (the one that corresponds with the app store) and so now I get this error: reason = "Can't find model for source store"; I have created my model and to the best of my knowledge I have made the changes exactly the same from the previous version... yet I still can't get it to like my model version. So

问题 I want create a posts model, with tags, and be able to display all tags for each post. You know a best way to do it ?? I tried this <template name='postsLists'> {{#each post}} {{> postDetails }} {{/each}} </template> <template name='postDetails'> title: {{title}} {{#each tag}} {{tag}} {{/each}} </template> 回答1: You need to use this keyword to get value from an array: <template name='postDetails'> title: {{title}} {{#each tag}} {{this}} {{/each}} </template> 回答2: This code won't work: {{#each

问题 While defining an asset in hyperledger composer model file, how do we deal with forms, images, videos? What are the data types available? For example, if my asset is house and I want to store an image of the house how do I define this in an asset? I have referred the documentation, it says the primitive data types available are string, integer, double, DateTime and boolean.] 回答1: So technically, this is a Node question. Using Javascript, eg. fs.readFileSync(‘yourimageFile.jpg’).toString(

问题 I'm trying to get my models related using ReferenceProperty, but not have a huge amount of luck. I have 3 levels: Group, Topic, then Pros, and Cons. As in a Group houses many topics, and within each topic could be many Pros and Cons. I am able to store new Groups nice and fine, but I don't have any idea how to store topics underneath these groups. I want to link from a page with a link "New topic" underneath each group, that takes them to a simple form (1 field for now). Obviously the URL

问题 I'm trying to convert a JSON to GSON , but I can not model. Can anyone give me an example with this one. [ { "id": "1", "name": "lalala", "object1": [ "string1", "string1", "string1" ], "object2": [ "anotherString1", "anotherString2" ] }, { "id": "2", "name": "laaaaalala", "object1": [ "string1", "string1", "string1" ], "object2": [ "anotherString1", "anotherString2" ] } ] Thanks 回答1: Here you go. import java.io.FileReader; import java.util.List; import com.google.gson.Gson; public class Foo

问题 I am aware that the purpose of volatile variables in Java is that writes to such variables are immediately visible to other threads. I am also aware that one of the effects of a synchronized block is to flush thread-local memory to global memory. I have never fully understood the references to 'thread-local' memory in this context. I understand that data which only exists on the stack is thread-local, but when talking about objects on the heap my understanding becomes hazy. I was hoping that

问题 Here's what I'm trying to do: public ActionResult Index() { return View(); } [HttpPost] public ActionResult Index(ContactModel model) { if (ModelState.IsValid) { // Send email using Model information. return RedirectToAction("Gracias", model); } return View(model); } public ActionResult Gracias(ContactModel model) { return View(model); } All three action methods are in the same controller. Basically, a user type up some data in the contact form and I want to redirect them to a thank you page