我对Angular和ng-options.有点困惑.

我有一个简单的数组,我想用它初始化一个选择.但是,我希望选项值=标签.

的script.js

$scope.options = ['var1', 'var2', 'var3'];

HTML

<select ng-model="myselect" ng-options="o for o in options"></select>

我得到了什么:

<option value="0">var1</option>
<option value="1">var2</option>
<option value="2">var3</option>

我想要的是:

<option value="var1">var1</option>
<option value="var2">var2</option>
<option value="var3">var3</option>

所以我尝试过:

<select ng-model="myselect2" ng-init=0 ng-options="options[k] as v for (k,v) in options"></select>

<select ng-model="myselect3" ng-init=0 ng-options="b as b for b in options"></select>

(但它不起作用.)

编辑:

我的表单是外部提交的,这就是为什么我需要'var1'作为值而不是0.

我是RoR的新手并且坚持这个设计问题.我想允许用户使用电子邮件或用户名登录(使用用户名注册已经可以).

我按照这些文章: 第1条和第2条,您可以看到以下结果:

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  before_filter :configure_permitted_parameters, if: :devise_controller?

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:username, :email, :password) }
    devise_parameter_sanitizer.for(:sign_in) { |u| u.permit(:login, :password, :remember_me) }
  end
end

user.rb

class User < ActiveRecord::Base
    devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable, :authentication_keys => [:login]

  validates_uniqueness_of :username
  validates_presence_of :username
  validates :username, length: { in: 4..20 }

  def self.find_first_by_auth_conditions(warden_conditions)
    conditions = warden_conditions.dup
    if login = conditions.delete(:login)
      where(conditions).where(["lower(username) = :value OR lower(email) = :value", { …

我遇到了 SqlAlchemy 问题。

我只想删除一个关系。这种关系是由关联对象建立的。

楷模

class User(db.Model, UserMixin):
    id                  = db.Column(db.Integer, primary_key=True)
    email               = db.Column(db.String(255), unique=True)
    username            = db.Column(db.String(255), unique=True)
    password            = db.Column(db.String(255))
    following           = db.relationship('Follower', foreign_keys='Follower.user_id')
    followed_by         = db.relationship('Follower', foreign_keys='Follower.follow_user_id')

    def __repr__(self):
        return '<%s (%i)>' % (self.username, self.id)

class Follower(db.Model):
    __tablename__       = 'followers'

    user_id             = db.Column(db.Integer, db.ForeignKey('user.id'), primary_key=True)
    follow_user_id      = db.Column(db.Integer, db.ForeignKey('user.id'), primary_key=True)
    created_at          = db.Column(db.DateTime, default=datetime.datetime.now)

    user_followed       = db.relationship("User", primaryjoin=(follow_user_id==User.id))
    user                = db.relationship("User", primaryjoin=(user_id==User.id))

    def __repr__(self):
        return '<%i %i>' % (self.user_id, self.follow_user_id)

我如何添加关系（它有效！）：

u1 = # user 1 …