@file_alias_tfile = FileAliasTfile.create（file_alias_tfile_params）

Question

使用Ruby on Rails 4，我有一个UI，用户可以从服务器上的目录路径中选择一个视频文件。然后，他们单击一个按钮，在该文件上运行媒体信息并显示视频的xml，同时解析xml中的某些数据值，并将值分配给@variables并将其显示回UI html页面。这一切都在动作/方法中完成，评估媒体＆＃39;。当页面加载回来时，它确定是否已保存此文件，并允许用户将文件名，路径和媒体信息属性保存到mysql中的表。当您单击“保存”按钮时，它会调用acton / method＆＃39; save_file＆＃39;。当我尝试将这些变量值分配给模型类字段以插入表（在控制器内）时。不读取值。它只插入空值。怎么样我可以在＆＃39; evaluate_media＆＃39;中分配这些变量值吗？行动也可用于＆＃39; save_file＆＃39;动作或同一控制器内的任何其他动作？根据它们的设置和定义方式，我认为它们可以在模型/控制器对象的范围内使用＆＃39; file_alias_tfile＆＃39;。

在＆＃39; save_file＆＃39;这里的行动是我尝试分配价值的3种不同方式：

    full_path = params[:filepath2]  <--This one puts a NULL into the table  
    src_location = @radio_button_value  <--This one puts a NULL into the table
    directory = "#{@dir_path_choice}"  <--This one doesn't even get called into the insert script and nothing is inthe column on insert. (I don't get errors and a record does geet inserted with the other good values.)into the table

这是我的save_file操作/方法代码，我试图将我的变量值分配给模型字段：

  def save_file    

        src_location = @radio_button_value
        directory = "#{@dir_path_choice}"
        full_path = params[:filepath2]
 #       "#{@filepathname}"
        full_filename = "#{@filepath}"
        alias_code = "#{@file_alias}"
        validate_status = "#{@file_status}" 
        error_msg = "#{@file_msg}"
        video_alias_match = "#{@msg_dtl1}" 
    audio_alias_match = "#{@msg_dtl2}" 
    video_format = "#{@video_format}" 
    video_bitrate = "#{@video_bitrate}" 
    video_width = "#{@video_width}"
    video_height = "#{@video_height}" 
    video_framerate = "#{@video_framerate}" 
    video_aspect_ratio = "#{@video_aspectratio}" 
    video_scan_type = "#{@video_scantype}"
    video_scan_order = "#{@video_scanorder}" 

    @file_alias_tfile = FileAliasTfile.new( :src_location => src_location, :directory => directory, :full_path => full_path, :full_filename => full_filename, :file_ext => '', 
                                                  :assigned_status => 'Unassigned', :file_status => 'Saved', :alias_code => alias_code, :validate_status => validate_status, :error_msg => error_msg, 
                                                  :video_alias_match => video_alias_match, :audio_alias_match => audio_alias_match, :video_format => video_format, :video_bitrate => video_bitrate, 
                                                  :video_width => video_width, :video_height => video_height, :video_framerate => video_framerate, :video_aspect_ratio => video_aspect_ratio, 
                                                  :video_scan_type => video_scan_type, :video_scan_order => video_scan_order, :video_alias_code => '', :audio_alias_code => '', 
                                                  :bus_prod_initiative_id => 0, :status => 'Active', :start_date => DateTime.now.to_date, :end_date => '', :deleted_b => 0, 
                                                  :created_by => 'admin', :updated_by => 'admin')

@file_alias_tfile = FileAliasTfile.create（file_alias_tfile_params）

if @file_alias_tfile.save
  redirect_to mainpages_home_path, :notice => "The file alias validation has been saved."
else
  redirect_to alias_mainpages_home_path, :notice => "The file alias validation has been saved."

＃render =＆＃34; index＆＃34; 结束结束

这是＆＃39; evaluate_media＆＃39;在save_file中定义上面调用的值的方法：

def evaluate_media @state =＆＃39; post＆＃39; @radio_button_value = params [：location]

 #Determine if file chosen has been saved to database yet.
 @stored_file = FileAliasTfile.where(:full_path => params[:filepath2], :deleted_b => 0).first

 if @stored_file.present?
    @file_exists_flag = 'Y'
    @file_exists_msg = 'This File and Alias has been saved in application.'
 else
    @file_exists_flag = 'N'
    @file_exists_msg = 'This File and Alias has NOT been saved in application yet.'
  end

      root_dir = '/watchfolder/miniprod/hot/'
      provider_dir = ""

   #Store selected value for re-display on post.
   @selected_filepath = params[:filepath2]

filepath = File.join（root_dir，provider_dir，params [：filepath]）

   @filepath = File.join(params[:filepath2])  

   @media_xml = ::MediaInfo.call(@filepath)  #Filepath is sent in from the index html
   @alias_xml = ::AliasGenerator.call(@media_xml)

   @media_xml_for = ""
   @alias_xml_for = ""
   REXML::Document.new(@media_xml).write(@media_xml_for, 1)
   REXML::Document.new(@alias_xml).write(@alias_xml_for, 1)
   alias_parse_doc = ""
   media_parse_doc = ""
   alias_parse_doc = REXML::Document.new(@alias_xml)  
   media_parse_doc = REXML::Document.new(@media_xml) 


   #parse Alias XML Doc   
   # @aliasgen_ver = alias_parse_doc.elements.each("/aliasGenerator vr=/text()") { |e| e }
   @aliasgen_ver = REXML::XPath.each(alias_parse_doc, "/aliasGenerator vr=/text()") { |element| element }    
   @file_alias = REXML::XPath.each(alias_parse_doc, "*//alias/text()") { |element| element }
   @file_status = REXML::XPath.each(alias_parse_doc, "*//error/text()") { |element| element }
   @file_msg = REXML::XPath.each(alias_parse_doc, "*//error_m/text()") { |element| element }
   @msg_dtl1 = REXML::XPath.each(alias_parse_doc, "*//closestvideoalias/text()") { |element| element }
   @msg_dtl2 = REXML::XPath.each(alias_parse_doc, "*//closestaudioalias/text()") { |element| element }

   #parse Video Media Info XML Doc  
    @filepathname = REXML::XPath.each(media_parse_doc, "*//Complete_name/text()") { |element| element }  
    @video_format = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Format/text()") { |element| element }
    @video_bitrate = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Bit_rate/text()") { |element| element }  
    @video_width = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Width/text()") { |element| element } 
    @video_height = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Height/text()") { |element| element }
    @video_aspectratio = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Display_aspect_ratio/text()") { |element| element } 
    @video_framerate = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Frame_rate/text()") { |element| element } 
    @video_scantype = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Scan_type/text()") { |element| element } 
    @video_scanorder = REXML::XPath.each(media_parse_doc, "//track[@type='Video']/Scan_order/text()") { |element| element }   

   #parse Audio Media Info XML Doc 
  #  @audio_track = REXML::XPath.each(media_parse_doc, "//track[@type= 'Audio']/track/text()") { |element| element } 
 #   @track_array = REXML::XPath.each(media_parse_doc,(@audio_track)) do {|track| track.elements["Bit_rate"].text }
  #   @bitrate = track.elements["Bit_rate"].text
  #  end
    #@audio_tracknum = REXML::XPath.each(media_parse_doc, "//track[@type='Audio']/track streamid=/text()") { |element| element } 
   # @audio_format = REXML::XPath.each(media_parse_doc, "//track[@type='Audio']/Format/text()") { |element| element } 
   # @audio_bitrate = REXML::XPath.each(media_parse_doc, "//track[@type='Audio']/Bit_rate/text()") { |element| element }  
   # @audio_numchan = REXML::XPath.each(media_parse_doc, "//track[@type='Audio']/Width/text()") { |element| element } 
   # @audio_language = REXML::XPath.each(media_parse_doc, "//track[@type='Audio']/Display_aspect_ratio/text()") { |element| element } 

   render :action => :index

端

您能否请我举例说明如何正确设置变量以传递操作和/或如何在插入数据库中正确分配它们？

感谢您的帮助！

Answer 1

我在另一个问题中为我的搜索找到了答案，但它仍然留下了一个悬而未决的问题。

以下是其他问题和答案的链接以获取更多详细信息： Same instance variable for all actions of a controller

基本上它给了我两种方法。如果我的一个动作不是从另一个动作渲染，并且两个方法都需要访问这些值，那么我将需要定义另一个方法来分配变量，然后让save_file和evaluate_media方法调用这个新定义的方法，这样它们也可以访问变量。下面是一个示例，其中问题解决了索引并显示共享相同变量的方法。

def index
  set_up_instance_variable
end

def show
  set_up_instance_variable
end

private

def set_up_instance_variable
  @some_instance_variable = foo
end

另一个解决方案是使用before_filter：

您可以使用前置过滤器为多个操作定义实例变量，例如：

class FooController < ApplicationController
  before_filter :common_content, :only => [:index, :show]

 def common_content
    @some_instance_variable = :foo
  end
end

现在可以从索引或show actions渲染的所有模板（包括部分模板）访问@some_instance_variable。

在Rails4中如何在一个控制器操作中分配变量，并在另一个控制器操作中使用它的值

@file_alias_tfile = FileAliasTfile.create（file_alias_tfile_params）

filepath = File.join（root_dir，provider_dir，params [：filepath]）

1 个答案: