How to get the filename of uploaded file in rails contoller

问题

<%= file_field 'upload' %>

In my controller, if I give the following, based on suggestions

filename=params[:upload]
@result=filename.original_filename

I am getting.

undefined method `original_filename' for 
#<ActionController::Parameters:0x002b6c396e44b8> 

Note: I am not using form. Rails version is 4.0.2

回答1:

Use the following code in order to get the filename:

params[:file].original_filename

回答2:

Have you read how to upload files in Rails? Have you set your form to multipart: true? What will be in the params is either a StringIO or a File (depending on the size of the upload). On that object, you will have an original_filename attribute, which is the filename of the uploaded file.

edit: I see you said you aren't using a form to submit... What alternative steps have you taken to make that work in general?

回答3:

Did you add permit for :upload params

def some_params
   params.require(:something).permit(:upload)
end

[Refer on rails document] http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-permit

回答4:

Try:

params[:pictures][0]["picture_path"].original_filename.split(".").first

来源：https://stackoverflow.com/questions/21979570/how-to-get-the-filename-of-uploaded-file-in-rails-contoller