从iPhone上传照片到Rails服务器attachment_fu
问题描述:
我想我已经能够从iPhone发送照片时使用的多部分格式轨,但一旦照片得到Rails的服务器,我无法弄清楚如何保存正确。我认为文件中的Rails的服务器为“userfile的”下面的参数的结尾是否存在params时显示iphone_photo_to_website叫做:从iPhone上传照片到Rails服务器attachment_fu
Parameters: {"action"=>"iphone_photo_to_website","id"=>"8A39FA8F_1ADD_52AB_8387_E1C5CFC4AB2D", "controller"=>"users", "userfile"=>#<File:/tmp/RackMultipart30053-0>}
我使用下面的Objective-C代码发送从iPhone的照片从下面的SO问题:
How can I upload a photo to a server with the iPhone?
NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"logo1" ofType:@"png"];
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
NSString *urlString = [NSString stringWithFormat:@"%@/users/iphone_photo_to_website/%@",
serverString, UID];
NSMutableURLRequest *imageRequest = [[NSMutableURLRequest alloc] init] ;
[imageRequest setURL:[NSURL URLWithString:urlString]];
[imageRequest setHTTPMethod:@"POST"];
NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[imageRequest setValue:contentType forHTTPHeaderField: @"Content-Type"];
NSMutableData *body = [NSMutableData dataWithCapacity:[imageData length] + 512];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"logo1.png\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[imageRequest setHTTPBody:body];
theConnection = [[NSURLConnection alloc] initWithRequest:imageRequest
delegate:self];
在Rails服务器数据库中的照片迁移/迁移的样子:
class CreatePhotos < ActiveRecord::Migration
def self.up
create_table :photos do |t|
t.column :user_id, :integer
t.column :title, :string
t.column :body, :text
t.column :created_at, :datetime
# the following are for attachment_fu
t.column :photo, :binary
t.column :content_type, :string
t.column :filename, :string
t.column :size, :integer
t.column :parent_id, :integer
t.column :thumbnail, :string
t.column :width, :integer
t.column :height, :integer
end
end
def self.down
drop_table :photos
end
end
在铁轨上的服务器我有以下代码的照片模型的应用程序/模型/ photo.rb:
class Photo < ActiveRecord::Base
has_attachment :storage => :file_system,
:resize_to => '640x480',
:thumbnails => { :thumb => '160x120', :tiny => '50>' },
:max_size => 5.megabytes,
:content_type => :image,
:processor => 'Rmagick'
validates_as_attachment
belongs_to :user
end
和Rails控制器具有下面的代码:
def iphone_photo_to_website
@udid = params[:id]
@userfile = params[:userfile]
@photo_params = { :user_id => @user.id,
:photo => @userfile,
:content_type => 'image',
:filename => @userfile.original_path,
:uploaded_data => @userfile
}
image = Photo.new(@photo_params)
image.save
end
当“ image.save“执行,它返回”false“。有谁知道我怎么能找到什么错误导致image.save返回false?或者是否有人知道我如何在数据库中正确保存照片?
答
我终于能够将图像保存到使用下面的代码数据库:
@userfile = params[:userfile]
image = Photo.new(:uploaded_data => params[:userfile])
image.user_id = @user.id
image.photo = @userfile
image.width = 105
image.height = 104
basename = File.basename(image.filename).gsub(/[^\w._-]/, '')
image.content_type = "image/" + basename.split("\.")[1]
image.save
当图像被作为Photo.new使用uploaded_data领域创建的,则image.filename被设定。
我也不得不删除从iPhone上的Objective-C代码以下行得到的东西的工作。
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];