ActiveRecord経由でrailsアプリのすべてのテーブル、スキーマのハッシュを取得するスニペット

table_schame_hash.rb

#  { 'Org'  => ['id:integer','name:string'],
#    'User' => ['id:integer','email:string'] }
# 
# NOTE: If there is no corresponding model in the DB, it will warn.

err = []
ActiveRecord::Base.connection.tables.each_with_object({}) do |table_name, hash|
  begin
    next if table_name == 'schema_migrations'
    next if table_name == 'ar_internal_metadata'
    
    key = table_name.singularize.camelize
    value = eval("#{key}.column_names").each_with_object([]) do |column, array|
      column_type = eval("#{key}.columns_hash[column].type")
      array << "#{column}:#{column_type}"
    end
    hash[key] = value
  rescue NameError => e
    err << "hey, don't seem to have a model but exist table: #{e.message}"
  end
end

puts err.map(&:red)