ActiveRecord query in initializer file

rubyonrails-talk
1

Hi all,

I set up a constant in an initializer file (under /config/initializers/ myfile.rb) like this:

MYCONST = Model.find(:all).size

The problem is that rake fails to run some operations like db:migrate or db:reset, due to the fact that my Model table doesn't exist at some stages. Even with a "unless Model.nil?" it fails.

How can I test if the model exists to avoid error during rake? I don't need this constant for rake tasks but only for normal execution of my app.

Read you, Jej

2

Hi all,

I set up a constant in an initializer file (under /config/initializers/ myfile.rb) like this:

MYCONST = Model.find(:all).size

Model.count is preferred here. Model.find(:all).size loads everything into memory first.

The problem is that rake fails to run some operations like db:migrate or db:reset, due to the fact that my Model table doesn't exist at some stages. Even with a "unless Model.nil?" it fails.

How can I test if the model exists to avoid error during rake? I don't need this constant for rake tasks but only for normal execution of my app.

Read you, Jej

I think you want defined?(Model), i.e.:

MYCONST = Model.count if defined?(Model)

Jeff

purpleworkshops.com

3

Model.count is preferred here. Model.find(:all).size loads everything into memory first.

Thanks for this trick.

MYCONST = Model.count if defined?(Model)

Yes, perfect!

Thanks Jeff.