models | 易学教程

Redirect on catching an exception in a method in the model

阅读更多关于 Redirect on catching an exception in a method in the model

问题 I am using Authlogic-connect to connect various service providers. There is a method in user.rb def complete_oauth_transaction token = token_class.new(oauth_token_and_secret) old_token = token_class.find_by_key_or_token(token.key, token.token) token = old_token if old_token if has_token?(oauth_provider) self.errors.add(:tokens, "you have already created an account using your #{token_class.service_name} account, so it") else self.access_tokens << token end end When a service provider is

Entity type has no key defined EF6

阅读更多关于 Entity type has no key defined EF6

问题 Here is my code although I already have refined the key attribute but still there is a problem. public class Contacts { [Key] public int ContactId { get; set; } public string Name { get; set; } public string Address { get; set; } public string City { get; set; } public string State { get; set; } public string Zip { get; set; } [DataType(DataType.EmailAddress)] public string Email { get; set; } } The error I get is: Entity Type 'Contacts' has no key defined. Define the key for this entity type

Split queryset or get multiple querysets by field instead of just ordering by field

阅读更多关于 Split queryset or get multiple querysets by field instead of just ordering by field

问题 I want to query a database in a way such that rather than just ordering by some field, I get a separate QuerySet (or dictionary, list, whatever) for each unique value of that field. Hopefully the below example will help: Suppose a model like Class Person(models.Model): first_name = models.CharField() last_name = models.CharField Calling Person.objects.all().order_by('last_name') gives me a single long QuerySet. I want instead to have a separate list for each unique last_name. So one list for

jwt+djangorestframework

阅读更多关于 jwt+djangorestframework

创建一个名为API的Django工程目录和名为Blog_RestApi的app API----->urls.py from django.contrib import admin from django.urls import path, include urlpatterns = [ path('admin/', admin.site.urls), path('api/',include('Blog_RestApi.urls')) ] API----->Blog_RestApi----->urls.py from django.urls import path, include from Blog_RestApi import views urlpatterns=[ path('sublogin/', views.SupLoginView.as_view()), path('suborder/', views.SubOrderView.as_view()), ] 生成jwt的token模块 Blog_RestApi---->utils---->jwt_create_token.py import datetime import jwt from django.conf import settings def create_token(payload, timeout=1): #

Error: A “url” property or function must be specified, except url is specified

阅读更多关于 Error: A “url” property or function must be specified, except url is specified

问题 I have a Conversation model and a view that displays this model. This model is fetched from the server without any problem (the url property works fine then), and the view is rendered. However, when I attempt to destroy the model in a function of the view, I get the error 'A "url" property or function must be specified', even though when I display said url right before the destroy call, it is exactly the url it should be. Here is the code for the model: MessageManager.models.Conversation =

Two very different user models in Devise

阅读更多关于 Two very different user models in Devise

问题 I have two different types of users in my application that uses Devise for authentication using Rails 4 but they have very different fields. One is a Buyer and the other is a Seller. The Buyer must have location and payment information while the Seller doesn't. Initially I thought it would be a good idea to create two separate Devise models but there has to be a better way. I thought about keeping it all in the same table and serializing the Buyer's payment data. What would be a good solution

Sequelize: seed with associations

阅读更多关于 Sequelize: seed with associations

问题 I have 2 models, Courses and Videos, for example. And Courses has many Videos. // course.js 'use strict'; module.exports = (sequelize, DataTypes) => { const Course = sequelize.define('Course', { title: DataTypes.STRING, description: DataTypes.STRING }); Course.associate = models => { Course.hasMany(models.Video); }; return Course; }; // video.js 'use strict'; module.exports = (sequelize, DataTypes) => { const Video = sequelize.define('Video', { title: DataTypes.STRING, description: DataTypes

Performance: QML window repaints himself very slow

阅读更多关于 Performance: QML window repaints himself very slow

问题 I've created this QML window but when I grab it's border with a mouse and resize it contents of window are repainted very slow. You can clone my repo and test it yourself. Any ideas how to improve performance? import QtQuick 2.0 Rectangle { id: root width: 600 height: 600 color: "lightgrey" ListView { model: mainModel spacing: 5 width: parent.width orientation: ListView.Horizontal delegate: Rectangle { //width: parent.desiredWidth / mainModel.dataLen()//+ " " + model.sort width: root.width /

Performance: QML window repaints himself very slow

阅读更多关于 Performance: QML window repaints himself very slow

Display m2m field defined via 'through' in admin

阅读更多关于 Display m2m field defined via 'through' in admin

问题 I have the following model classes: class Category(models.Model): category = models.CharField('category', max_length=200, blank=False) class Book(models.Model): title = models.CharField('title', max_length=200, blank=False) categories = models.ManyToManyField(Category, blank=False, through='Book_Category') class Book_Category(models.Model): book = models.ForeignKey(Book) category = models.ForeignKey(Category) When adding a new book object in admin interface I would like to also add a new