所以我正在尝试关注 railscast（#182 修订版）& JCrop 似乎对我不起作用。我不确定它是否与我的 RMagick 或 Imagemagick 安装有关，或者我只是缺少教程中的某些内容。我在网上搜索过类似的问题，但似乎无法找到解决我做错了什么的方法。当我创建一个新的调查时，我添加了一张图片，点击保存，然后它会将我带到裁剪屏幕。当我单击裁剪时，出现以下错误：
ArgumentError in Investigations#show
Showing /Users/bbarton250/Documents/app/app/views/investigations/show.html.erb where line #8 raised:
Version cover doesn't exist!
Extracted source (around line #8):
<div id="aboutus">
<div class="container">
<div class="padd" style="padding: 0px 0px 10px 10px">
<div class="section_header cover_art" style="background: url('<%= @investigation.investigationimage_url(:cover).to_s %>') no-repeat;">
<div class="whitetitle">
<h3><%= @investigation.title %></h3>
<%= render 'shared/investigationstats' %>
Rails.root: /Users/bbarton250/Documents/app
Application Trace | Framework Trace | Full Trace
app/views/investigations/show.html.erb:8:in `_app_views_investigations_show_html_erb___1313059905282739098_70290275302200'
Request
Parameters:
{"id"=>"82"}
任何帮助将不胜感激...谢谢
我的 CROP.HTML.ERB 文件
<div class="row-fluid">
<div id="aboutus">
<div class="container">
<div class="padd" style="padding:30px 10px 10px 10px">
<div class="section_header">
<div class="row-fluid">
<h3>Crop Investigation Cover Image</h3>
</div><br/>
<div class="row-fluid">
<%= image_tag @investigation.investigationimage_url(:profile), id: "cropbox" %>
<%= form_for @investigation do |f| %>
<% %w[x y w h].each do |attribute| %>
<%= f.hidden_field "crop_#{attribute}" %>
<% end %><br clear="all">
<div class="actions">
<%= f.submit "Crop" %>
</div>
<% end %>
</div>
</div>
</div>
</div>
</div>
</div>
我的宝石档案
source 'https://rubygems.org'
gem 'rails'
gem 'bootstrap-sass'
gem 'bcrypt-ruby'
gem 'will_paginate'
gem 'bootstrap-will_paginate'
gem "rmagick"
gem 'carrierwave'
gem 'auto_html'
调查模型
class Investigation < ActiveRecord::Base
attr_accessible :title, :content, :investigationimage, :user_id, :crop_x, :crop_y, :crop_w, :crop_h
validates :title, presence: true, length: { maximum: 140 }
validates :content, presence: true
validates :investigationimage, presence: true
mount_uploader :investigationimage, ImageUploader
attr_accessor :crop_x, :crop_y, :crop_w, :crop_h
after_update :crop_investigationimage
def crop_investigationimage
investigationimage.recreate_versions! if crop_x.present?
end
default_scope -> { order('created_at DESC') }
end
INVESTIGATIONIMAGE_UPLOADER.RB
# encoding: utf-8
class InvestigationimageUploader < CarrierWave::Uploader::Base
# Include RMagick or MiniMagick support:
include CarrierWave::RMagick
# include CarrierWave::MiniMagick
# Choose what kind of storage to use for this uploader:
storage :file
# storage :fog
# Override the directory where uploaded files will be stored.
# This is a sensible default for uploaders that are meant to be mounted:
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
# Provide a default URL as a default if there hasn't been a file uploaded:
# def default_url
# # For Rails 3.1+ asset pipeline compatibility:
# # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
#
# "/images/fallback/" + [version_name, "default.png"].compact.join('_')
# end
# Process files as they are uploaded:
# process :scale => [200, 300]
#
# def scale(width, height)
# # do something
# end
# Create different versions of your uploaded files:
version :thumb do
process :resize_to_limit => [100, 100]
end
version :profile do
process :resize_to_limit => [1400, 300]
end
version :search do
process :resize_to_limit => [200, 150]
end
version :cover do
process :crop
resize_to_fill(1400, 300)
end
def crop
if model.crop_x.present?
resize_to_limit(1400, 300)
manipulate! do |img|
x = model.crop_x.to_i
y = model.crop_y.to_i
w = model.crop_w.to_i
h = model.crop_h.to_i
img.crop!(x, y, w, h)
end
end
end
end
INVESTIGATIONS.JS.COFFEE JAVASCRIPT 文件
# Place all the behaviors and hooks related to the matching controller here.
# All this logic will automatically be available in application.js.
# You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/
jQuery ->
new InvestigationImageCropper()
class InvestigationImageCropper
constructor: ->
$('#cropbox').Jcrop
aspectRatio: 24/9
setSelect: [0,0,1400,300]
onSelect: @update
onChange: @update
update: (coords) =>
$('#investigation_crop_x').val(coords.x)
$('#investigation_crop_y').val(coords.y)
$('#investigation_crop_w').val(coords.w)
$('#investigation_crop_h').val(coords.h)
调查负责人
class InvestigationsController < ApplicationController
before_filter :signed_in_user, only: [:create, :new, :edit, :update, :followers]
def new
@investigation = Investigation.new
end
def show
@investigation = Investigation.find(params[:id])
end
def index
@investigations = Investigation.paginate(page: params[:page])
end
def create
@investigation = Investigation.new(params[:investigation])
if @investigation.save
if params[:investigation][:investigationimage].present?
render :crop
else
flash[:success] = "You've successfully created an Investigation..."
redirect_to @investigation
end
else
render 'new'
end
end
def edit
end
def update
@investigation = Investigation.find(params[:id])
if @investigation.update_attributes(params[:investigation])
if params[:investigation][:investigationimage].present?
render :crop
else
flash[:success] = "Investigation Created"
redirect_to @investigation
end
else
render 'edit'
end
end
def destroy
User.find(params[:id]).destroy
flash[:success] = "Investigation destroyed"
redirect_to users_path
end
def followers
@title = "Following this Investigation"
@investigation = Investigation.find(params[:id])
@investigations = @investigation.followers.paginate(page: params[:page])
render 'show_follow_investigation'
end
end
SHOW.HTML.ERB（调查资料）
<% provide(:title, @investigation.title) %>
<div class="row-fluid">
<div id="aboutus">
<div class="container">
<div class="padd" style="padding: 0px 0px 10px 10px">
<div class="section_header cover_art" style="background: url('<%= @investigation.investigationimage_url(:cover).to_s %>') no-repeat;">
<div class="whitetitle">
<h3><%= @investigation.title %></h3>
<%= render 'shared/investigationstats' %>
</div>
</div>
</div>
</div>
</div>
</div>
感谢帮助！