Parse a xml uploaded with camt_parser rails gem

I installed the camt_parser gem in my rails app. My goal is to upload and parse camt_file (.xml).

It works perfectly when I parse from a local file this way:

require 'camt_parser'
require 'camt'
camt = CamtParser::File.parse 'CAMT053_140518.xml'
puts camt.group_header.creation_date_time
camt.statements.each do |statement|
    statement.entries.each do |entry|
        # Access individual entries/bank transfers
     #   puts "->"
     puts entry.description
     puts entry.debit
     p entry.transactions[0].iban
     p entry.transactions[0].transaction_id
     puts entry.transactions[0].debitor.iban
    end
end

But when I try to upload it from my view as a file using this code:

<%= form_tag '/patient_page/import_camt', :multipart => true do %>
    <label for="file">Upload text File</label> <%= file_field_tag "file" %>
    <%= submit_tag %>
<% end %>

and

the corresponding method:

def import_camt
    uploaded_file = params[:file]
    parsed_file = uploaded_file.read
    camt = CamtParser::File.parse uploaded_file
    puts camt.group_header.creation_date_time
    camt.statements.each do |statement|
        statement.entries.each do |entry|

        puts entry.description
        puts entry.debit
        p entry.transactions[0].iban
        p entry.transactions[0].transaction_id
        puts entry.transactions[0].debitor.iban
        end
    end
  end

I get the following error

"no implicit conversion of ActionDispatch::Http::UploadedFile into String" at the line when I try to parse the uploaded file.

Any hints?

Thx!

Solution

CamtParser::File.parse is expecting a file path but you are passing an ActionDispatch::Http::UploadedFile object.

When you upload a file in rails the file is wrapped in an instance of ActionDispatch::Http::UploadedFile. To access the file itself there is an attribute called tempfile.

This will return the Tempfile that represents the actual file that is being uploaded. A Tempfile has a path method which is the path to the file itself so since CamtParser::File.parse is expecting a file path it can be called as follows

CamtParser::File.parse(uploaded_file.tempfile.path)

CamtParser also has a String class that can parse an appropriate string so you could call this as

CamtParser::String.parse(uploaded_file.read)

This works because ActionDispatch::Http::UploadedFile exposes the method read which is the same as calling uploaded_file.tempfile.read