CODEWITHSUNDEEP
ruby-on-railsrubyfileruby-on-rails-4readfile
heroxav
heroxav

Reputation: 1467

Rails 4:TypeError - no implicit conversion of String into Integer

I am reading an empty HTML-File like this:

file = File.read("file_path/file.html", "wb")

Why does that throw this TypeError?

no implicit conversion of String into Integer



Log:

Completed 500 Internal Server Error in 8ms (ActiveRecord: 0.0ms)

TypeError (no implicit conversion of String into Integer):
  app/controllers/abc_controller.rb:49:in `read'
  app/controllers/abc_controller.rb:49:in `build'

Upvotes: 2

Views: 1590

Answers (2)

Eric Duminil
Eric Duminil

Reputation: 54223

If the file is empty, what do you want to read exactly?

The second parameter for File#read is optional, and should be the length of the String you want to read out of the file. "wb" isn't an Integer, hence the error messsage.

The parameters you used look more like open.

Read a file

If you want to read the file, just use

content = File.read(filename)

Write a file

If you want to write it, you can use

File.open(filename,'w+') do |file|
  file.puts "content"
end

'w+' is a file mode which :

Overwrites the existing file if the file exists. If the file does not exist, creates a new file for reading and writing.

Existence of a file

If you want to check that a file exists :

File.exists?(filename)

Is a file empty?

If you want to check that an existing file is empty :

File.size(filename)==0

The file could be full of whitespaces (size > 0, but still "empty"). With Rails :

File.read(filename).blank?

Upvotes: 5

Ajaykumar
Ajaykumar

Reputation: 416

For reading a file you can use rb instead of wb.

data = File.open("ur path","rb")

Upvotes: 0

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