destroy

问题 I'm new to Rails, so I'm sure I've made a simple mistake. I've set up a many-to-many relationship between two models: User and Group . They're connected through the junction model GroupMember . Here are my models (removed irrelevant stuff): class User < ActiveRecord::Base has_many :group_members has_many :groups, :through => :group_members end class GroupMember < ActiveRecord::Base belongs_to :group belongs_to :user end class Group < ActiveRecord::Base has_many :group_members has_many :users,

问题 How do I destroy the association itself and leave the objects being associated alone, while keeping this RESTful? Specifically, I have these models: class Event < ActiveRecord::Base has_many :model_surveys, :as => :surveyable, :dependent => :destroy, :include => :survey has_many :surveys, :through => :model_surveys end class ModelSurvey < ActiveRecord::Base belongs_to :survey belongs_to :surveyable, :polymorphic => true end class Survey < ActiveRecord::Base has_many :model_surveys end That's

问题 First of all I should remind you I have read this question , I am using Codeigniter 3 . I want to destroy session with browser closing like PHP session ! I have read somethings about using ajax like this : var unloadHandler = function(e){ //here ajax request to close session }; window.unload = unloadHandler; and .... But I dont want to make myself dependent to js for destroy session with browser closing . this is my config.php $config['sess_driver'] = 'files'; $config['sess_cookie_name'] =

问题 I have to create a class that implements ServletContextListener to add an event during the initialization or the shutdown of Tomcat. However, the class has to be located in a jar file inside WEB-INF/lib . After doing some readings, I found out that this is not possible, and the alternative is to use ServletContainerInitializer. However, only onStartup() method is available. Is there any other alternatives where I can also add an event during the shutdown or destruction of the web application?

问题 I have this object that contains references to other objects: 1)views 2)view controllers 3)dictionaries 4)arrays 5)custom objects. what's the best way to destroy it? do I need to create a destroy method that will deal with the destruction of its different properties? are there special things to be done in each one of these types or I just set them all to nil? note: I am using ARC. thanks, Nimrod 回答1: It depends on whether you use Automatic Reference Counting (ARC) or not. Without ARC you have

问题 I have a session scoped CDI managed bean: @Named @SessionScoped public class SampleBean implements Serializable { // ... } I need to remove this bean from the session after a certain flow for which I used the following code like as seen in this answer: ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext(); ec.getSessionMap().remove("sampleBean"); However, it does not work and the SampleBean remains in the session. Am I missing something? 回答1: In contrary to JSF managed

问题 Here is my issue: I have a login page called login.php (containing no HTML code). When the user types in his credentials correctly he's redirected to a specific page; we'll say test.php for this example. The only links on that page logout of the current session, and return the user to index.html. My problem is that if the user presses the back button, it goes back to login.php and you get a blank page. If you navigate away from that blank page you have no way to get back to test.php thus no

问题 I am using Ruby on Rails 3 and I would like to know what type of return will have the following code: @user.destroy I need that to handle cases on success and fault in someway like this: if @user.destroy puts "True" else puts "false" end Is it possible? If so, how? 回答1: You should try what you're asking before asking. What you've got there will work just fine. If the destroy works, it will return the object (which will pass as true in an if statement) and if not, it will return false or raise

问题 SETUP One Activity, SingleTop, receives an intent from a notification. Intent is consumed by activity. User hits back button to end the activity. onDestory gets called and isFinishing() returns true. Long press Home key to bring up recent apps. Launch previously closed application. Similar situation occurs with onNewIntent when onStop is called after user presses home key on activity. Problem Upon recreation of the activity after it's finished, the same intent from the notification is used. I

问题 Is this code valid? <a href="#" onclick="<?php session_destroy();?>">Logout</a> 回答1: No it is not a valid code. It will destroy the session at the time of loading the php page. For destroying session on click you should write <a href="logout.php" >Logout</a> in logout.php session_destroy(); 回答2: Make a page called logout.php Logout.php_ _ ___ <?php Session_start(); Session_destroy(); header('Location: ' . $_SERVER['HTTP_REFERER']); ?> Your page_ _ ____ <a href="Logout.php">Logout</a> 回答3: