rails上传图片代码实例

今天讲解一下rails的图片上传，就是最平常的上传图片 这里的rails版本2.3.5

首先新建一个write_pic model内容如下：

class writepic
require "rmagick"
require "uuid"
def self.write(pic_data,ori_name,resize = nil,file_type = "jpg",tag=false)
#file.delete("c:/programdata/ruby-uuid") if rails_gem_version == '2.1.2'
uuid = ori_name || "#{uuid.new.generate}.#{file_type}"
i = magick::image.from_blob(pic_data).first
if resize
p=resize[:width].to_i*1.00 /i.columns
i.resize!(resize[:width],resize[:height]|| i.rows*p)
end
wh=0
width = i.columns
height = i.rows
if width > height
wh =1
end
i.write("#{rails_root}/public/images/user_pic/#{uuid}")
if tag
return wh,uuid
else
return uuid
end
end
def self.get_pic(url)
uuid = "#{uuid.new.generate}.#{file_type}"
img_orig1 = magick::image.read(url).first
image1 = img_orig1.resize_to_fit(300,300)
image1.write("#{rails_root}/public/images/weibo_pic/#{uuid}")
return uuid
end
end

上传 图片是用的插件所以最上面加载了插件。

调用write_pic 这个model的model文件写法如下

class theme < activerecord::base
require "rmagick"
require "uuid"
def _image=(picture_field)
if picture_field != ""
self.image = writepic.write(picture_field.read,self.image,nil)
end
end
def _image
self.image
end
def suoluetu=(picture_field)
if picture_field != ""
self.thumbnail = writepic.write(picture_field.read,self.thumbnail,nil,"png")
end
end
def suoluetu
self.thumbnail
end
end

 

controller里面不用在乎太多，直接上view

<h1>new theme</h1>
<% form_for(@theme,:html=>{:multipart=>'true'}) do |f|%>
<%= f.error_messages %>

<p>
<%= f.label :name %><br />
<%= f.text_field :name %>
</p>
<p>
<%= f.label :color %><br />
<%= f.text_field :color %>
</p>
<p>
<%= f.label :lastcolor %><br />
<%= f.text_field :lastcolor %>
</p>
<p>
<%= f.label :image %><br />
<%= f.file_field :_image %>
</p>
<p>
<%= f.label :thumbnail %><br />
<%= f.file_field :suoluetu %>
</p>
<p>
<%= f.submit "create" %>
</p>
<% end %>

<%= link_to 'back', themes_path %>