Rails: How to get a applcation controller variable to my application layout
I'm trying to get a variable set in the application controller to bubble up to the application layout.
If I use:
@var = 'foo'
...the application layout doesn't know what I'm talking about
If I use a global variable
$var = 'foo'
... the application layout works. However, m开发者_高级运维y functional tests don't work:
# application layout
# my var is an AR object
$var.name
# Stock functional test
class HomeControllerTest < ActionController::TestCase
test "should get index" do
get :index
assert_response :success
end
end
# test:functionals
ActionView::Template::Error: undefined method `name' for nil:NilClass
I need this var available to the application layout (every page). Thoughts? Do I need to make this a session var?
Update
Based on a few other posts I'm reading, is it considered best practice to place these in the application helper, then call them from the layout?
# Application helper
def get_var
Product.first
end
# Application layout
<% @var = get_var %>
<!DOCTYPE html>
<html lang="en">
<head>
...
This a) works in my browser and b) passes tests. Is it best practice? Is there an easier/better way?
Did you try before_filter the method where the variable is declared to make sure each other controller calls it and pass the variable to their corresponding view?
class ApplicationController < ActionController::Base
before_filter :foo_function
def foo_function
@var = "foo"
end
end
If @var is an AR object and not a string, you sure you have the Model name and column name defined correctly?
Have you tried implement it as a helper_method?
class ApplicationController < ActionController::Base
helper_method :foo, :foo=
def foo
@var ||= "foo"
end
def foo=(val)
@var = val
end
end
加载中,请稍侯......
精彩评论