上傳base64圖像與回形針 - 導軌4

Question

我相對較新的Rails，並會感謝任何幫助。

我的網站接受base64格式的簽名圖像，我試圖使用回形針適配器來解碼圖像並將其保存到我的form模型中作爲:signature屬性。我使用的建議使用下面的代碼中給出here（和here）建議：

在模型：

class Thing 
    has_attached_file :image 

在控制器：

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

我的假設是，Thing.create!被設置將Paperclip的模型屬性:image的值設爲image變量的值，同時創建並保存新的Thing對象。我想實現我的FormsController（create動作）之前@form.save相同的代碼，但我收到此錯誤：

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

我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 

這是我Form型號：

class Form < ActiveRecord::Base 

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

end 

Answer 1

假設您在視圖中使用Rails表單助手，並基於您的form_params列表中，:base64密鑰將不在您的params散列的頂層，而是在params[:form][:base64]的下一級