class TableNameToClass

Convert a table name into a class constant (or nil if no constant for that table)

Expects:

name (object like string):: Name of database table, this can be anything
                            that returns a valid table name when hit with
                            to_s
force_update (boolean):: Should the table/class correspondence be updated?
                         Any none-nil value triggers a reload.

Returns:

nil if the lookup fails, the constant for the class associated with the
table otherwise.

# File lib/table-name-to-class.rb, line 18
def self.convert(name, force_update = nil)
  init_hash unless @@conversion_hash || force_update
  @@conversion_hash[name.to_s]
end

Debug helper

Returns the hash of table name and class constant pairs

# File lib/table-name-to-class.rb, line 27
def self.debug
  return @@conversion_hash
end

:doc:

Loads the correspondence cache

Recursively visits every .rb file in app/models and requires them all. This is required to avoid failures when trying to convert the name of a table who's model has not yet been loaded.

# File lib/table-name-to-class.rb, line 39
def self.init_hash
  # Expanded from idea posted here: http://stackoverflow.com/a/6150228

  # Recursively require all models
  Dir.glob(Rails.root.join('app','models','**','*').to_s).each do |f|
    begin
      require f if File.file?(f) && f =~ /\.rb$/
    rescue IdentityCache::AlreadyIncludedError
    end
  end

  @@conversion_hash = Hash[
    ActiveRecord::Base.descendants.map {|c| [c.table_name, c]}
  ]
end