我安装了paperclip gem来管理app中的用户头像，但是当我尝试更改用户默认头像时，它不会改变。我没有收到任何错误，表格保存正确。似乎照片没有上传。
我做错了什么？我是新手，我无法弄明白。
型号：
getJSON('http://collidr-vidya.herokuapp.com/api/v1/scores').then(function (data) {
debugger;
alert('Your Json result is: ' + data.scores); //you can comment this, i used it to debug
result.innerText = data.scores; //display the result in an HTML element
}, function (status) { //error detection....
alert('Something went wrong.');
});
控制器：
class User < ActiveRecord::Base
has_many :posts
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_attached_file :avatar, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/avatar.gif"
validates_attachment_content_type :avatar, content_type: /\Aimage\/.*\Z/
end
修改视图：
class UsersController < ApplicationController
def create
@user = User.create( user_params )
end
def update
@user = User.find(params[:id])
@user.update_attribute(:avatar, params[:user][:avatar])
end
private
# Use strong_parameters for attribute whitelisting
# Be sure to update your create() and update() controller methods.
def user_params
params.require(:user).permit(:avatar)
end
end
我的路线：
<h2>Edit <%= resource_name.to_s.humanize %></h2>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f| %>
<%= devise_error_messages! %>
<form>
<div class="form-group">
<div class="field">
<%= f.label :email %><br />
<%= f.email_field :email, autofocus: true, class: "form-control" %>
</div>
<% if devise_mapping.confirmable? && resource.pending_reconfirmation? %>
<div>Currently waiting confirmation for: <%= resource.unconfirmed_email %></div>
<% end %>
<div class="field">
<%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
<%= f.password_field :password, autocomplete: "off", class: "form-control" %>
</div>
<div class="field">
<%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation, autocomplete: "off", class: "form-control" %>
</div>
<div class="field">
<%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i><br />
<%= f.password_field :current_password, autocomplete: "off", class: "form-control" %>
</div>
<%= image_tag @user.avatar.url(:medium) %>
<%= form_for @user, url: users_path, html: { multipart: true } do |form| %>
<%= form.file_field :avatar %>
<% end %>
<br>
<div class="actions">
<%= f.submit "Update", class: "btn btn-success" %>
</div>
<% end %>
</div></form>
<p><%= button_to "Delete my account", registration_path(resource_name), data: { confirm: "Are you sure?" }, method: :delete, class: "btn btn-danger" %></p>
来自DB的记录：
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
categories GET /categories(.:format) categories#index
topics GET /topics(.:format) topics#index
POST /topics(.:format) topics#create
new_topic GET /topics/new(.:format) topics#new
edit_topic GET /topics/:id/edit(.:format) topics#edit
topic GET /topics/:id(.:format) topics#show
PATCH /topics/:id(.:format) topics#update
PUT /topics/:id(.:format) topics#update
DELETE /topics/:id(.:format) topics#destroy
posts GET /posts(.:format) posts#index
POST /posts(.:format) posts#create
new_post GET /posts/new(.:format) posts#new
edit_post GET /posts/:id/edit(.:format) posts#edit
post GET /posts/:id(.:format) posts#show
PATCH /posts/:id(.:format) posts#update
PUT /posts/:id(.:format) posts#update
DELETE /posts/:id(.:format) posts#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
root GET / categories#index
答案 0 :(得分：1)
要为Devise注册添加新属性，您可以覆盖部分内容，而不是将婴儿扔出洗澡水：
# app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < Devise::RegistrationsController
before_filter :configure_permitted_parameters
protected
def configure_permitted_parameters
devise_parameter_sanitizer.permit(:sign_up, [:avatar])
devise_parameter_sanitizer.permit(:account_update, [:avatar])
end
end
# config/routes.rb
devise_for :users, controllers: { registrations: "user/registrations" }
确保您的观看次数为app/views/users/registrations/new.html.erb和app/views/users/registrations/edit.html.erb。
添加更多路线是一种天真的解决方案 - 你严重低估了Devise控制器实际完成的工作量。例如，您的控制器不会签署用户或甚至检查授权。
答案 1 :(得分：0)
感谢您对@max和@Kuba的建议。现在一切正常。我刚刚将以下代码添加到application_controller.rb：
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
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( :email, :password) }
devise_parameter_sanitizer.for(:account_update) { |u| u.permit( :email, :password, :current_password, :avatar) }
end
end