How to call app Model in initializers with Ruby on Rails

问题

I am new in Ruby on Rails and i am using Ruby version 2.1.0 and Rails 4.0.2

My Query is:-

I want to call Model in initializers.

my Model file is setting.rb and Model name Setting. its location is app/model directory.

I want to call Setting Model in initializers file paypal.rb.

paypal.rb location is config/initializers/paypal.rb.

Please help how to call Model in initializers in Ruby on Rails.

回答1:

Do you want to make sure all other initializers have run before running this one? If so you could do this:

# config/initializers/paypal.rb
Rails.configuration.after_initialize do
  paypal_settings = Setting.find_by(name: "paypal")
  # do something with paypal settings...
end

回答2:

To get around that problem I did this:

1. First I check if the table exists.
2. Then I check if my record exists.
3. Otherwise I just set a default value.

It's kind of a hack but it works for my use case.

if ActiveRecord::Base.connection.table_exists? :settings # check if table exists
  if Setting.first.present? # check if first record has been seeded
    NUMBERS = Setting.first.my_numbers.split(",")
  else
    NUMBERS = '987654321'
  end
else
  NUMBERS = '123456789'
end

回答3:

In the rails, wherever you are, you can interact with Models. Like

Setting.method_name()

Inside the rails application, you can create your own new folder(expect default directories created by rails new command) and can interact with Model methods.

来源：https://stackoverflow.com/questions/22680047/how-to-call-app-model-in-initializers-with-ruby-on-rails