Ruby on Rails错误：“未定义的方法`call”表示“result == false”：字符串“create method中的错误
当我尝试使用图像在我的应用中创建列表时，会抛出此错误：
undefined method `call' for "result == false":String. 我安装了devise gem之后发生了错误。 但设计不应该与创建新的列表有任何关系？
该应用程序的其他部分工作正常，我可以创建没有图像的新列表。
错误信息
NoMethodError in ArtistsController#create undefined method `call' for "result == false":String
它指向的方法是在第164行的ActiveSupport中的回调方法
https://sourcegraph.com/github.com/rails/rails@master/.rubygem/activesupport/.def/ActiveSupport/Callbacks/$methods/halted_callback_hook
任何人都有任何想法可能是什么问题？ 我对此很新，所以如果您需要我提供更多信息或者我需要重新解释我的问题，请告诉我。
的Gemfile
source 'https://rubygems.org' ruby "2.0.0" gem 'rails', '4.2.0.beta2' gem 'uglifier', '>= 1.3.0' gem 'coffee-rails', '~> 4.0.0' gem 'jquery-rails' gem 'turbolinks' gem 'jbuilder', '~> 1.2' gem 'bootstrap-sass', '~> 3.3.0' gem 'sass-rails', '~> 5.0.0.beta1' gem "paperclip", "~> 3.0" gem "paperclip-dropbox", ">= 1.1.7" gem "figaro" gem 'devise' group :production do gem 'pg' gem 'rails_12factor' end group :development, :test do gem 'sqlite3' end group :doc do gem 'sdoc', require: false end
Artists_controller，似乎在控制器中为create方法抛出了exception
class ArtistsController < ApplicationController before_action :set_artist, only: [:show, :edit, :update, :destroy] # GET /artists # GET /artists.json def index @artists = Artist.all end # GET /artists/1 # GET /artists/1.json def show end # GET /artists/new def new @artist = Artist.new end # GET /artists/1/edit def edit end # POST /artists # POST /artists.json def create @artist = Artist.new(artist_params) respond_to do |format| if @artist.save format.html { redirect_to @artist, notice: 'Artist was successfully created.' } format.json { render action: 'show', status: :created, location: @artist } else format.html { render action: 'new' } format.json { render json: @artist.errors, status: :unprocessable_entity } end end end # PATCH/PUT /artists/1 # PATCH/PUT /artists/1.json def update respond_to do |format| if @artist.update(artist_params) format.html { redirect_to @artist, notice: 'Artist was successfully updated.' } format.json { head :no_content } else format.html { render action: 'edit' } format.json { render json: @artist.errors, status: :unprocessable_entity } end end end # DELETE /artists/1 # DELETE /artists/1.json def destroy @artist.destroy respond_to do |format| format.html { redirect_to artists_url } format.json { head :no_content } end end private # Use callbacks to share common setup or constraints between actions. def set_artist @artist = Artist.find(params[:id]) end # Never trust parameters from the scary internet, only allow the white list through. def artist_params params.require(:artist).permit(:name, :description, :price, :image) end end
用户类
class User < ActiveRecord::Base # Include default devise modules. Others available are: # :confirmable, :lockable, :timeoutable and :omniauthable devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable end
艺术家class（上市模特）
class Artist { :medium => "200x", :thumb => "100x100>" }, :default_url => "/images/:style/missing.png" validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/ end
表格助手
{ :multipart => true }) do |f| %> prohibited this artist from being saved:
完整的痕迹
app/controllers/artists_controller.rb:27:in `create' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:161:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:87:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:87:in `run_callbacks' paperclip (3.5.4) lib/paperclip/callbacks.rb:26:in `run_paperclip_callbacks' paperclip (3.5.4) lib/paperclip/attachment.rb:419:in `block in post_process' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:83:in `run_callbacks' paperclip (3.5.4) lib/paperclip/callbacks.rb:26:in `run_paperclip_callbacks' paperclip (3.5.4) lib/paperclip/attachment.rb:418:in `post_process' paperclip (3.5.4) lib/paperclip/attachment.rb:112:in `assign' paperclip (3.5.4) lib/paperclip/has_attached_file.rb:65:in `block in define_setter' activerecord (4.2.0.beta2) lib/active_record/attribute_assignment.rb:54:in `public_send' activerecord (4.2.0.beta2) lib/active_record/attribute_assignment.rb:54:in `_assign_attribute' activerecord (4.2.0.beta2) lib/active_record/attribute_assignment.rb:41:in `block in assign_attributes' actionpack (4.2.0.beta2) lib/action_controller/metal/strong_parameters.rb:170:in `each_pair' actionpack (4.2.0.beta2) lib/action_controller/metal/strong_parameters.rb:170:in `each_pair' activerecord (4.2.0.beta2) lib/active_record/attribute_assignment.rb:35:in `assign_attributes' activerecord (4.2.0.beta2) lib/active_record/core.rb:551:in `init_attributes' activerecord (4.2.0.beta2) lib/active_record/core.rb:272:in `initialize' activerecord (4.2.0.beta2) lib/active_record/inheritance.rb:61:in `new' activerecord (4.2.0.beta2) lib/active_record/inheritance.rb:61:in `new' actionpack (4.2.0.beta2) lib/action_controller/metal/implicit_render.rb:4:in `send_action' actionpack (4.2.0.beta2) lib/abstract_controller/base.rb:198:in `process_action' actionpack (4.2.0.beta2) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (4.2.0.beta2) lib/abstract_controller/callbacks.rb:20:in `block in process_action' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:114:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:114:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:148:in `block in halting_and_conditional' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:231:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:231:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:231:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:231:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:166:in `block in halting' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:87:in `call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:87:in `run_callbacks' actionpack (4.2.0.beta2) lib/abstract_controller/callbacks.rb:19:in `process_action' actionpack (4.2.0.beta2) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (4.2.0.beta2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' activesupport (4.2.0.beta2) lib/active_support/notifications.rb:164:in `block in instrument' activesupport (4.2.0.beta2) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.2.0.beta2) lib/active_support/notifications.rb:164:in `instrument' actionpack (4.2.0.beta2) lib/action_controller/metal/instrumentation.rb:30:in `process_action' actionpack (4.2.0.beta2) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' activerecord (4.2.0.beta2) lib/active_record/railties/controller_runtime.rb:18:in `process_action' actionpack (4.2.0.beta2) lib/abstract_controller/base.rb:137:in `process' actionview (4.2.0.beta2) lib/action_view/rendering.rb:30:in `process' actionpack (4.2.0.beta2) lib/action_controller/metal.rb:195:in `dispatch' actionpack (4.2.0.beta2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' actionpack (4.2.0.beta2) lib/action_controller/metal.rb:236:in `block in action' actionpack (4.2.0.beta2) lib/action_dispatch/routing/route_set.rb:72:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/routing/route_set.rb:72:in `dispatch' actionpack (4.2.0.beta2) lib/action_dispatch/routing/route_set.rb:41:in `serve' actionpack (4.2.0.beta2) lib/action_dispatch/journey/router.rb:43:in `block in serve' actionpack (4.2.0.beta2) lib/action_dispatch/journey/router.rb:30:in `each' actionpack (4.2.0.beta2) lib/action_dispatch/journey/router.rb:30:in `serve' actionpack (4.2.0.beta2) lib/action_dispatch/routing/route_set.rb:750:in `call' warden (1.2.3) lib/warden/manager.rb:35:in `block in call' warden (1.2.3) lib/warden/manager.rb:34:in `catch' warden (1.2.3) lib/warden/manager.rb:34:in `call' rack (1.6.0.beta) lib/rack/etag.rb:23:in `call' rack (1.6.0.beta) lib/rack/conditionalget.rb:38:in `call' rack (1.6.0.beta) lib/rack/head.rb:13:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/flash.rb:257:in `call' rack (1.6.0.beta) lib/rack/session/abstract/id.rb:225:in `context' rack (1.6.0.beta) lib/rack/session/abstract/id.rb:220:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/cookies.rb:558:in `call' activerecord (4.2.0.beta2) lib/active_record/query_cache.rb:36:in `call' activerecord (4.2.0.beta2) lib/active_record/connection_adapters/abstract/connection_pool.rb:645:in `call' activerecord (4.2.0.beta2) lib/active_record/migration.rb:378:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.2.0.beta2) lib/active_support/callbacks.rb:83:in `run_callbacks' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/reloader.rb:73:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.2.0.beta2) lib/rails/rack/logger.rb:38:in `call_app' railties (4.2.0.beta2) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.2.0.beta2) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.2.0.beta2) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.2.0.beta2) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.2.0.beta2) lib/rails/rack/logger.rb:20:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.6.0.beta) lib/rack/methodoverride.rb:22:in `call' rack (1.6.0.beta) lib/rack/runtime.rb:17:in `call' activesupport (4.2.0.beta2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' rack (1.6.0.beta) lib/rack/lock.rb:17:in `call' actionpack (4.2.0.beta2) lib/action_dispatch/middleware/static.rb:103:in `call' rack (1.6.0.beta) lib/rack/sendfile.rb:113:in `call' railties (4.2.0.beta2) lib/rails/engine.rb:514:in `call' railties (4.2.0.beta2) lib/rails/application.rb:161:in `call' rack (1.6.0.beta) lib/rack/tempfile_reaper.rb:15:in `call' rack (1.6.0.beta) lib/rack/lint.rb:49:in `_call' rack (1.6.0.beta) lib/rack/lint.rb:37:in `call' rack (1.6.0.beta) lib/rack/showexceptions.rb:24:in `call' rack (1.6.0.beta) lib/rack/commonlogger.rb:33:in `call' rack (1.6.0.beta) lib/rack/chunked.rb:54:in `call' rack (1.6.0.beta) lib/rack/content_length.rb:15:in `call' rack (1.6.0.beta) lib/rack/handler/webrick.rb:89:in `service' /Users/arezarazu/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service' /Users/arezarazu/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run' /Users/arezarazu/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
查看堆栈跟踪和您提供的代码，问题似乎是在Artist类中调用has_attached_file 。
我怀疑这个问题是由paperclip gem 3.5.4和Rails 4.2之间的不兼容引起的。 我建议你升级回形针gem。
在该gem的更改列表中，我看到列出的版本为4.1.1：
错误修复：Rails 4.1中的回调链终结符不同，删除警告
这可能是罪魁祸首。
如果你正在运行Rails 4.0+，请确保按照建议将’paperclip’gem文件更改为’〜> 4.2’。 它将是：’paperclip’，’〜> 4.2′