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rails上传图片代码实例

2024-04-10 21:45:03 418

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_picmodel内容如下：

classWritePic
require"RMagick"
require"uuid"
defself.write(pic_data,ori_name,resize=nil,file_type="jpg",tag=false)
#File.delete("c:/programData/ruby-uuid")ifRAILS_GEM_VERSION=='2.1.2'
uuid=ori_name||"#{UUID.new.generate}.#{file_type}"
i=Magick::Image.from_blob(pic_data).first
ifresize
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
ifwidth>height
wh=1
end
i.write("#{RAILS_ROOT}/public/images/user_pic/#{uuid}")
iftag
returnwh,uuid
else
returnuuid
end
end
defself.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}")
returnuuid
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

classTheme<ActiveRecord::Base
require"RMagick"
require"uuid"
def_image=(picture_field)
ifpicture_field!=""
self.image=WritePic.write(picture_field.read,self.image,nil)
end
end
def_image
self.image
end
defsuoluetu=(picture_field)
ifpicture_field!=""
self.thumbnail=WritePic.write(picture_field.read,self.thumbnail,nil,"png")
end
end
defsuoluetu
self.thumbnail
end
end

controller里面不用在乎太多，直接上view

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

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

<%=link_to'Back',themes_path%>

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rails上传图片代码实例

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