scope

问题 OK, I asked this question earlier today How do I write a scope to search for attributes on a nested model? and got a great answer on searching for attributes in nested models in Rails. In the previous question a scope was written that found all patients that had an admission with a discharge_time of nil (Thanks tjwallace). class Patient < ActiveRecord::Base has_many :admissions scope :admitted, includes(:admissions).where('admissions.discharge_time' => nil) end What I'm trying to do now is to

问题 Okay, beginner Java coder here. I'm trying to make a multi-purpose math utility application with Java Swing. One of the things I want it to do is be able to solve basic logarithms. I have the logic all down, but I'm having trouble with the outputting itself. I have a class (named "LogTab") and within it is a nested static class (named "LogPanel") for the actual input area. The button is outside the LogPanel class, and when I press it I want it to be able to take the values of the TextFields

问题 I'm a bit confused on why I am not seeing the parent scope inside a Mongoose Query Callback, here is my code: var P = require('bluebird'); var getUser = P.promisify( function(userId, locals, next){ logger.info(locals); //{offer: 1} User.findOne({_id: userId}).lean().exec(function(err, user){ logger.info(locals); //undefined if(err){return next(err);} if(!locals) locals = {user: user}; else{ locals.user = user; } return next(null, locals); }); } ); var locals = {offer: 1}; getUser(user._id,

问题 What a crappy title. Maybe someone can edit it for me. Here's the scoop: I need to work in jQuery no-conflict mode, but I'd still like to take advantage of the $ shortcut, so all of my functions etc are defined within the typical closure of (function($){ ... })(jQuery); All this is defined in an external source.js file that is included at the top of my HTML web page. A little later on, I need to add some inline <script> that uses one of the utility functions I defined within the closure.

问题 I have a rails app. I would like to display user profiles ordered by the number of the common tasks they have with the current user. Every task has one assigner and one executor. The number should include both the executed_tasks and assigned_tasks for the same user. So for example if current_user assigned 5 tasks to User4 and User4 assigned 3 tasks to current_user then this number would be 8. My main problem is that I don't know how to use the given user as arg for the count. Should I do in

问题 I'm trying to create a scope that's a little out of the ordinary. I've got an app that deals with websites. There's a model called "sites", which has_many pages. The sites model has a column called homepage. The list of pages for each site contains the homepage and additional pages (about, pricing, whatever). I'd like to create two scopes for the pages model. One identifies the homepage and the other identifies all the additional pages. I was thinking of something like this. my_homepage =

问题 I have some code which seems similair to this: #include <iostream> class Base { public: void test() { std::cout << "Base::test()" << std::endl; } void test2() { test(); } }; class Derived : public Base { public: void test() { std::cout << "Derived::test()" << std::endl; } }; int main() { Derived d; d.test2(); return 0; } Now this outputs ofcourse Base::test() , however I want it to output Derived::test() without making use of virtual function calls and using an different notation for the

问题 I'm trying to update data of my chart using chartJS and its wrapper angular-chart. When a button is clicked, it adds data on the chart, no problem with this. I have another event, which update the chart after a scroll event. The call works great, and it calls exactly the same function as previous. But my $scope.valuesData isn't updated . Then I added a $scope.$apply() after the function, and it redraws the whole chart with the right values. Question are : Why does my $scope.chartValues is not

问题 I cannot figure out how to get a value back from a cordova plugin back to the app's javascript scope. I can send values to the plugin just fine. I'm using phonegap build. Here's the code: the plugin's javascript: var exec = require('cordova/exec'); module.exports = { getSomething: function(successCallback) { exec(successCallback, null, "PluginName", "getSomething", []); } }; the plugin's java: import blah blah blah; public class PluginName extends CordovaPlugin { public PluginName(){ } public

问题 What is the difference and relationship between the $scope passed in a controller , and the $scope passed in a directive ? And how would you set these up? 回答1: This is a brief explanation of what is the difference and relationship between the $scope passed in a controller , and the $scope passed in a directive is: As you can see form the basic Angular setup below, $scope is passed to both the Angular Controller and to the Angular Directive . But what are the differences, and how do these