Carrierwave程序上传
现在在我的rails应用程序中，我正在使用Carrierwave将文件上传到Amazon S3。 我正在使用文件选择器和表单来选择和提交文件，这很有效。
但是，我现在正试图从iPhone应用程序发帖并收到该文件的内容。 我想使用这些数据创建一个文件，然后使用Carrierwave上传它，这样我就能找到正确的路径。
May文件模型包括：
path file_name id user_id 其中path是Amazon S3url。 我想做这样的事情来构建文件：
data = params[:data] ~file creation magic using data~ ~carrierwave upload magic using file~ @user_id = params[:id] @file_name = params[:name] @path = path_provided_by_carrierwave_magic File.build(@user_id, @file_name, @path)
真的很想有人指出我正确的方向。 谢谢！
以下是我通过carrierwave从ios应用程序执行上传到s3的内容：
首先是Photo模型
class Photo include Mongoid::Document include Mongoid::Timestamps mount_uploader :image, PhotoImageUploader field :title, :type => String field :description, :type => String end
在Api :: V1 :: PhotosController中排名第二
def create @photo = current_user.photos.build(params) if @photo.save render :json => @photo.to_json, :status=>201 else render :json => {:errors => @photo.errors}.to_json, :status=>403 end end
然后使用AFNetworking从我的iPhone应用程序调用
-(void) sendNewPhoto { NSURL *url = [NSURL URLWithString:@"http://myserverurl.com"]; NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:_photoTitle.text, @"title", _photoDescription.text, @"description",nil]; AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url]; NSString *endUrl = [NSString stringWithFormat:@"/api/v1/photos?auth_token=%@", [[User sharedInstance] token]]; NSData *imageData = UIImageJPEGRepresentation(_photo.image, 1.0); NSURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST" path:endUrl parameters:params constructingBodyWithBlock:^(id formData) { [formData appendPartWithFileData:imageData name:@"image" fileName:@"image.jpg" mimeType:@"image/jpg"]; }]; AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) { NSLog(@"%@", JSON); } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { NSLog(@"Error creating photo!"); NSLog(@"%@", error); }]; [operation start]; }
在JSON响应中，我可以获取Photo的新实例，并将image.url属性设置为s3中的url。
好吧，我有一个有效的解决方案。 我将最好地解释我做了什么，以便其他人可以从我的经验中学习。 开始：
假设您有一个iPhone应用程序拍照：
//handle the image that has just been selected - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { //get the image UIImage* image = [info valueForKey:@"UIImagePickerControllerOriginalImage"]; //scale and rotate so you're not sending a sideways image -> method provided by http://blog.logichigh.com/2008/06/05/uiimage-fix/ image = [self scaleAndRotateImage:image]; //obtain the jpeg data (.1 is quicker to send, i found it better for testing) NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(image, .1)]; //get the data into a string NSString* imageString = [NSString stringWithFormat:@"%@", imageData]; //remove whitespace from the string imageString = [imageString stringByReplacingOccurrencesOfString:@" " withString:@""]; //remove < and > from string imageString = [imageString substringWithRange:NSMakeRange(1, [imageString length]-2)]; self.view.hidden = YES; //dismissed the camera [picker dismissModalViewControllerAnimated:YES]; //posts the image [self performSelectorInBackground:@selector(postImage:) withObject:imageString]; } - (void)postImage:(NSString*)imageData { //image string formatted in json NSString* imageString = [NSString stringWithFormat:@"{\"image\": \"%@\", \"authenticity_token\": \"\", \"utf8\": \"✓\"}", imageData]; //encoded json string NSData* data = [imageString dataUsingEncoding:NSUTF8StringEncoding]; //post the image [API postImage:data]; }[/code] Then for the post: [code]+(NSArray*)postImage:(NSData*) data { //url that you're going to send the image to NSString* url = @"www.yoururl.com/images"; //pretty self explanatory request building NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]]; [request setTimeoutInterval:10000]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPMethod: @"POST"]; [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [request setHTTPBody:data]; NSError *requestError; NSURLResponse *urlResponse = nil; NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&requestError]; return [API generateArrayWithData:result]; }
在轨道方面，我设置了专门用于处理移动图像的方法，这可以帮助您通过Carrierwave将图像发布到您的Amazon S3帐户：
def post respond_to do |format| format.json { #create a new image so that you can call it's class method (a bit hacky, i know) @image = Image.new #get the json image data pixels = params[:image] #convert it from hex to binary pixels = @image.hex_to_string(pixels) #create it as a file data = StringIO.new(pixels) #set file types data.class.class_eval { attr_accessor :original_filename, :content_type } data.original_filename = "test1.jpeg" data.content_type = "image/jpeg" #set the image id, had some weird behavior when i didn't @image.id = Image.count + 1 #upload the data to Amazon S3 @image.upload(data) #save the image if @image.save! render :nothing => true end } end end
这适合我发布，我觉得应该是相当可扩展的。 对于类方法：
#stores the file def upload(file) self.path.store!(file) end #converts the data from hex to a string -> found code here http://4thmouse.com/index.php/2008/02/18/converting-hex-to-binary-in-4-languages/ def hex_to_string(hex) temp = hex.gsub("\s", ""); ret = [] (0...temp.size()/2).each{|index| ret[index] = [temp[index*2, 2]].pack("H2")} file = String.new ret.each { |x| file << x} file end
不是说这段代码是完美的，甚至不是远视。 但是，它对我有用。 如果有人认为可以改进，我愿意接受建议。 希望这可以帮助！