系统不想在 ruby on rails 中写入 tmpfile? [英] System doesn't want to write tmpfile in ruby on rails?
问题描述
我正在 Ruby on Rails 中实现,我想这样做,在我的第一个视图中,我浏览到一个文件(CSV 文件).我读了它并将它放在一个临时文件中.然后在我的第二个视图中,例如显示前 5 行.然后在我的第三个视图中,我想再次显示第一行.我的控制器是:
I am implementing in Ruby on Rails, and i want to do so, that in my first view, i browse to a file (CSV-file). which i read in and put it in a TempFile. Then in my second view i show for example the first 5 lines. And then in my third view I want to show the first lines again. My controller is:
class ProjectImporterController < ApplicationController
unloadable
def index
end
end
def match
file = params[:file]
@parsed_file=CSV::Reader.parse(file)
sample_count = 5
@original_filename = file.original_filename
tmpfile = Tempfile.new("redmine_user_importer")
if tmpfile
tmpfile.write(file.read)
tmpfile.close
tmpfilename = File.basename(tmpfile.path)
if !$tmpfiles
$tmpfiles = Hash.new
end
$tmpfiles[tmpfilename] = tmpfile
else
flash[:error] = "Cannot save import file."
return
end
session[:importer_tmpfile] = tmpfilename
i = 0
@samples = []
@parsed_file.each do |row|
if i != 0
@samples[i] = row
end
if i == 0
@headers = row
end
if i >= sample_count
break
end
i = i+1
end
end
end
def result
tmpfilename = session[:importer_tmpfile]
if tmpfilename
tmpfile = $tmpfiles[tmpfilename]
if tmpfile
flash[:error] = "Tempfile doesn't exist!"
return
end
@parsed_file=CSV::Reader.parse(tmpfile)
@samples = []
@parsed_file.each do |row|
if i != 0
@samples[i] = row
end
if i == 0
@headers = row
end
if i >= sample_count
break
end
i = i+1
end
end
end
现在我的第一个视图的代码是:
Now my code for the first view is just:
<% form_tag({:action => 'match'}, {:multipart => true}) do %>
<table">
<tr>
<td>
<label for="dump_file">
Select a CSV File :
</label>
</td>
<td >
<%= file_field_tag 'file', :size => 60%></p>
</td>
</tr>
</table>
第二个和第三个视图相同:
second and third view are the same:
<ul>
<% @samples.each do |a| %>
<li>
<%= a %>
</li>
<% end %>
</ul>
这只是一个简单的例子,但在我的第二个视图中,一切正常,系统只显示第一个结果.但是在我的第三个视图中,我收到一条错误消息:nil:NilClass 的未定义方法 `each'.所以@samples = nil.有人知道我做错了什么吗?
This is just i simple example, but in my second view, everything works and the system just show the first results. But in my third view, i get an error which says :undefined method `each' for nil:NilClass. So that @samples = nil. Somebody who knows what i am doing wrong?
谢谢
推荐答案
您只能获得文件名,而没有完整路径.要获取上传的临时文件的路径,请在处理上传表单的操作中使用它:
You only get the filename without the full path. To get the Path to the uploaded Tempfile use this in the action proceeding your upload form:
tempfile=params[:file].tempfile.to_path.to_s
这会为您提供上传文件的完整路径,以便您可以打开文件.
This gives you full path to the uploaded file so you can open the file.
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