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I have a form that is attempting to read in a JSON file for parsing/actions/etc. I'm having problems getting it to read in the controller.
View:
<%= form_tag({:controller => :admins, :action => :upload_json}, {:multipart => true, :method => :post}) do |f| %>
<%= file_field_tag 'datafile' %>
<%= submit_tag "Upload" %>
Controller:
def upload_json
file_data = params[:datafile]
File.read(file_data) do |file|
file.each do |line|
## does stuff here....
end
end
end
A similar function works in my seed.rb file when I'm seeding data - just can't get it to read in an uploaded file.
The error I'm getting is: can't convert ActionDispatch::Http::UploadedFile into String.
Thanks in advance for the help!
256
Use File#readlines to Read Lines of a File in Ruby File#readlines takes a filename to read and returns an array of lines. Newline character \n may be included in each line. We must be cautious when working with a large file, File#readlines will read all lines at once and load them into memory.
Overview. The IO instance is the basis for all input and output operations in Ruby. Using this instance, we can read a file and get its contents line by line using the foreach() method. This method takes the name of the file, and then a block which gives us access to each line of the contents of the file.
Figured it out. Needed to change:
file_data = params[:datafile]
to
file_data = params[:datafile].tempfile
And decided to use the .open function to change:
File.read(file_data) do |file|
to
File.open(file_data, 'r') do |file|
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