scaffold

Scaffold.of() called with a context that does not contain a Scaffold

由 半城伤御伤魂 提交于 2019-12-17 15:24:01
问题 As you can see my button is inside Scaffold's body. But I get this exception: Scaffold.of() called with a context that does not contain a Scaffold. import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: HomePage(), ); } } class HomePage extends StatelessWidget { @override Widget build

Connect student_id to submission_id in Rails

由 北战南征 提交于 2019-12-12 04:32:29
问题 I was trying to connect my student_id to the submission_id, but it's not working. I have a join table which is called submissionstudent. Student Controller.rb: class StudentsController < ApplicationController before_action :set_student, only: [:show, :edit, :update, :destroy] # GET /students # GET /students.json def index @students = Student.all end # GET /students/1 # GET /students/1.json def show end # GET /students/new def new @student = Student.new end # GET /students/1/edit def edit end

Beginner with Rails 3.1 and “static” pages

由 …衆ロ難τιáo~ 提交于 2019-12-12 00:39:12
问题 I just started deploying a Rails website. In fact, I started programming on Rails 2 days ago. I've created a new project, added some gems, etc. Everything is working properly, and I have some basic knowledge on how all works. The thing is that what I want to create is a simple website with some sections (let's say, News, Contact, About, Products...). All this content is kinda static. But I came in a problem. I don't really know what to do in order to create them. What I want, for example, is

Grails with MongoDB, Object id, and scaffold

由 痴心易碎 提交于 2019-12-10 11:17:49
问题 I have data writing to a mongoDB database with issues using integration tests and the Grails scaffolding. When trying to select a domain instance from the 'list' type page, I get the error "[domain name] not found with id null". I am sure it is because of the Grails url [controller]/[action]/[id]. This id is a string and needs to be converted to an ObjectId for Grails queries. Is there a way to do this so that it affects a specified domain or even better yet, all of the domains at once? I

Define Scaffolding. (with respect to Dynamic Data and ASP.NET MVC)

由 ￣綄美尐妖づ 提交于 2019-12-09 05:01:34
问题 There is a lot of information about how to implement and customize scaffolding with Dynamic Data and ASP.NET MVC. What exactly is the definition of scaffolding when used in this context? 回答1: It means that the Dynamic Data framework will auto-generate a set of routes based on the table names in a data model (e.g. a Linq to SQL data context), and a predefined set of operations (essentially CRUD). When you e.g. visit http://example.com/Products/Details.aspx , where "Products" is the name of a

Changing scaffold-controller-generator-templates in Rails

由 谁说胖子不能爱 提交于 2019-12-07 07:53:32
问题 When I use the Rails scaffold generator to create my Rails-files, it creates among others a controller file. e.g. rails generate scaffold potato generates: app/controllers/potatos_controller.rb For my project I want this file a little more specific. E.g. I want to change this automatic generated action: def create @potato = Potato.new(potato_params) respond_to do |format| if @potato.save format.html { redirect_to @potato, notice: 'Potato was successfully created.' } format.json { render :show

Exception has been thrown by the target of an invocation thrown when scaffolding a controller

由 旧时模样 提交于 2019-12-06 20:20:18
问题 I created a separate Class Library project to store the Database Context and Model Classes. In the same solution, I created an ASP.NET MVC project and referenced the Class Library project, as well as include the Connection String for the Database Context, in the project's Web.config file. However, when I attempt to add a Controller (with views, using EF), I get the following error: Exception has been thrown by the target of an invocation. I am able to see the Database Context and Model

Grails with MongoDB, Object id, and scaffold

由 旧时模样 提交于 2019-12-06 05:39:15
I have data writing to a mongoDB database with issues using integration tests and the Grails scaffolding. When trying to select a domain instance from the 'list' type page, I get the error "[domain name] not found with id null". I am sure it is because of the Grails url [controller]/[action]/[id]. This id is a string and needs to be converted to an ObjectId for Grails queries. Is there a way to do this so that it affects a specified domain or even better yet, all of the domains at once? I guess as I'm writing my app, I can convert it to an ObjectId from within the action method, but I'd like

AppBar布局及相关属性

由 ▼魔方 西西 提交于 2019-12-06 03:23:16
AppBar属于基础组件，结构如下 以下示例显示一个带有两个简单操作的AppBar。第一个动作打开SnackBar，第二个动作导航到新页面。 import 'package:flutter/material.dart'; class LoginPage extends StatefulWidget { @override _LoginPageState createState() => _LoginPageState(); } class _LoginPageState extends State<LoginPage> { @override Widget build(BuildContext context) { final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>(); final SnackBar snackBar = const SnackBar(content: Text('Showing Snackbar')); return Scaffold( key: scaffoldKey, appBar: AppBar( title: const Text('AppBar Demo'), actions: <Widget>[ IconButton( icon: const Icon(Icons

首页轮播，并屏幕适配

由 好久不见. 提交于 2019-12-05 18:59:25
一、添加依赖 flutter_swiper: ^1.1.6 flutter_screenutil: ^0.6.1 查看最新版本： https://pub.flutter-io.cn 二、代码 import 'package:flutter/material.dart'; import 'package:flutter_swiper/flutter_swiper.dart'; import 'package:flutter_screenutil/flutter_screenutil.dart'; class HomePage extends StatefulWidget{ @override _HomePageState createState() => _HomePageState(); } class _HomePageState extends State<HomePage> { List _imageUrls = [ 'http://h.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=0d023672312ac65c67506e77cec29e27/9f2f070828381f30dea167bbad014c086e06f06c.jpg', 'http://h.hiphotos.baidu.com/zhidao/wh%3D450
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