Def self. Down
Drop_table: attaches
End
End
Execute rake DB: migrate will automatically create the table to the specified database
2. Create an uploadcontroller with the following content (for test purposes only, not for beautification)
Class uploadcontroller <applicationcontroller
Def Index
@ Attach_pages, @ attaches = paginate: attaches,: Order => 'last _ update desc',: per_page => 10
End
Def add
Begin
# Because multiple files are uploaded, loop is required here.
Params [: uploadfile]. Each do | file |
If file. kind_of? (Stringio) | file. exist? (File)
# Call a custom model to upload a file and pass session_id to rename the file to ensure that the file is not named again
Attach = attach. New (file, session. session_id)
Attach. Save
End
End
Rescue
Raise
End
Redirect_to: Action => "Index"
End
End
3. Modify the automatically generated model attach.
Class attach <activerecord: Base
Def initialize (upload, session_id)
File_upload (upload, session_id) # upload the execution File
Super ()
Self. Name = @ name
Self. url = @ URL
Self. types = @ Type
Self. size = @ size
Self. last_update = @ last_update
End
# File Upload
Def file_upload (upload, session_id)
Time_now = time. Now
@ Init_dir = "upload/# {time_no1_strftime ('% Y-% m-% D ')}"
Begin
Fileutils. mkpath (upload_path) unless file. directory? (Upload_path)
If upload. kind_of? (Stringio)
Upload. Rewind
End
Origname = upload. original_filename
Basename = file. basename (origname, ". *") # obtain the file name.
Extname = file. extname (origname). downcase # Get the file extension
Tmpname = "_ 1"
Tmpextname = "_" + time_no1_to_ I .to_s + extname
# Rename
Basename = session_id.nil? ? Digest: md5.hexdigest (basename). to_s: session_id.to_s
Basename = basename. upcase
Endname = basename + tmpextname
# Generating non-repeated file names
While file. exist? (Upload_path (endname ))
Arr = endname. Scan (/[a-zA-Z0-9 _] +/) [0]. Split ("_")
Endname = 2 = arr. Size? (Basename + tmpname + tmpextname): (basename + "_" + arr [1]. succ. to_s + tmpextname)
End
# Writing files to a disk
File. Open (upload_path (endname), "WB") {| f. Write (upload. Read )}
@ Name = origname
@ Url = "// # {@ init_dir}/# {endname }"
@ Type = (extname. Delete ".")
@ Size = upload. Size
@ Last_update = time_no1_to_ I
Rescue
Raise
End
End
# Generating absolute paths
Def upload_path (file = nil)
"# {Rails_root}/public/# {@ init_dir}/# {file. nil? ? '': File }"
End
End
4. Modify views/upload/index. rhtml
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> file upload test </title>
</Head>
<Body>
<! -- Used to display uploaded files -->
<Table border = "1">
<Tr>
<% For column in attach. content_columns %>
<TH> <% = column. human_name %> </Th>
<% End %>
</Tr>
<% For attach in @ attaches %>
<Tr>
<% For column in attach. content_columns %>
<TD> <% = H attach. Send (column. Name) %> </TD>
<% End %>
</Tr>
<% End %>
</Table>
<! -- Name it with [] for Ruby to get a file array -->
<H1> File Upload <% Form_tag ({: Action = >:add}, {: multipart => true}) Do-%>
File Name 1: <% = file_field_tag "uploadfile []"-%> <br/>
File name 2: <% = file_field_tag "uploadfile []"-%> <br/>
File Name 3: <% = file_field_tag "uploadfile []"-%> <br/>
File Name 4: <% = file_field_tag "uploadfile []"-%> <br/>
File name 5: <% = file_field_tag "uploadfile []"-%> <br/>
<% = Submit_tag "File Upload",: disable_with => "File Upload...",: Name => "btnsave",: Id => "btnsave" %>
<% End %>
</Body>
</Html>
CodeThe running effect is as follows:
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