使用 Paperclip 上传 base64 图像 - Rails 4

Upload base64 Image with Paperclip - Rails 4

我对 Rails 比较陌生,希望得到任何帮助。

我的网站接受 base64 格式的签名图像,我正在尝试使用 Paperclip 适配器解码图像并将其作为 :signature 属性保存到我的 form 模型中。我正在使用给出的建议 here (and here),建议使用以下代码:

模型中:

class Thing
    has_attached_file :image

在控制器中:

def create
  image = Paperclip.io_adapters.for(params[:thumbnail_data]) 
  image.original_filename = "something.gif"
  Thing.create!(image: image)
  ...
end

我的假设是 Thing.create! 将 Paperclip 的模型属性 :image 的值设置为 image 变量的值,同时创建和保存新的 Thing 对象。我试图在 @form.save 之前在我的 FormsController(创建操作)中实现相同的代码,但收到此错误:

undefined method `before_image_post_process' for #<Class:0x007f94a2a26de8>

我的FormsController:

class FormsController < ApplicationController
  before_action :logged_in_user
  before_action :admin_user, only: :destroy

  def index
    @forms = Form.all #paginate
  end

  def show
    @form = Form.find(params[:id])
  end

  def new
    @form = Form.new
  end

  def create
    @form = Form.new(form_params)

    # Paperclip adaptor 
    signature = Paperclip.io_adapters.for(params[:base64])
    signature.original_filename = "something.png"

    # Attempt to submit image through Paperclip
    @form.signature = signature

    if @form.save
      flash[:success] = "The form has been successfully created!"
      redirect_to @form
    else
      render 'new'
    end
  end

  def edit
    @form = Form.find(params[:id])
  end

  def update
    @form = Form.find(params[:id])
    if @form.update_attributes(form_params)
      flash[:success] = "Form has been updated!"
      redirect_to @form
    else
      render 'edit'
    end
  end

  def destroy
    Form.find(params[:id]).destroy
    flash[:success] = "Form deleted"
    redirect_to forms_path
  end

  private

  def form_params
    params.require(:form).permit(:first_name, :last_name, :email, :phone, :address, :member_type, :base64)
  end
end

这是我的 Form 型号:

class Form < ActiveRecord::Base

  has_attached_file :signature
  validates_attachment_content_type :image, :content_type =>     ["image/jpg", "image/jpeg", "image/png", "image/gif"]

 end

假设您在视图中使用 Rails 表单助手,并且根据您的 form_params 列表,:base64 键不会位于顶层您的 params 哈希值,而是在 params[:form][:base64]

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