Question

Here’s a sample of the code, which I’m trying to load from rails c (inside the lib folder–the file data2.json is also inside of the lib directory)

$LOAD_PATH.unshift(File.expand_path(".", File.dirname(__FILE__)))
$LOAD_PATH.unshift(File.expand_path("./lib", File.dirname(__FILE__)))

require 'company_gem_class'

class LoadJson

  def go
   File.open(Rails.root, 'lib', 'file.json') do |f|
      f.each_line do |line|
        this_line = JSON.parse(line)
        hash_parser = CompanyGemClass.new(line)
        c = Company.new
        c.followers = hash_parser.followers
        c.company_name = hash_parser.company_name
        c.date_joined = hash_parser.date_joined
        ...
        c.save
      end
    end
 ...
 end

The plan was/is to load all this raw data through a single (Company) class directly from the rails console. I’ve been getting lots of “json file does not exist” (Ennooent::path/to/file.json does not exist).

I’ve tried putting it in the lib/assets folder and lib folders, but no success yet. How might I go about this task of mass-uploading these json–>ruby objects to the db?

^^I’ve already bundle-installed the json gem.
^^The json files are one hash per line, so that’s why I did it like this

Answer 1

1. I’m sure you know (however it was not completely obvious from your question) that File.open does not use LOAD_PATH for anything. So no matter what you put in LOAD_PATH, it will not affect how File.open works. LOAD_PATH only modifies how require searches for files.

2. In Rails all your file operations should use Rails.root as the base path. You cannot rely on your current working directory to be something specific when working with Rails.

   So any LOAD_PATH modifications should be done with something like this:

   $LOAD_PATH.unshift(File.join(Rails.root, 'my', 'uber', 'lib'))
   

3. Because of (1) and (2) – If you’re going to open any file with File.open the most reliable way to do it is using Rails.root:

   File.open(File.join(Rails.root, 'path', 'to', 'file.json'))
   

   Or in your case:

   File.open(File.join(Rails.root, 'lib', 'assets', 'file.json'))
   

4. In Rails lib is already in your LOAD_PATH by default. So you do not need to add it separately.