Where to define Rails variable in application.html.erb

Question

I have a navbar that is placed in the /views/layouts/application.html.erb and in there I place the @buy and @sell variables which get the latest bitcoin price. They are currently placed in the /welcome controller so the prices only show when in the welcome controller. If I navigate to another controller, the bar just becomes empty.

@buy = coinbase.buy_price
@sell = coinbase.sell_price

That is the code that is currently placed in the welcome controller. I want it to be available to the navbar regardless of what controller the user is in. Any help would be great!

pcarvalho · Accepted Answer · 2013-12-23 05:07:31Z

5

place it in the application controller and use a before action

before_action :set_prices
def set_prices
    @buy = coinbase.buy_price
    @sell = coinbase.sell_price
end

answered Dec 23, 2013 at 5:07

pcarvalho

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2 Comments

user3024194 Over a year ago

Ok. Can I use @buy and @sell normally or do I have to do something like this: @buy.set_prices?

nahtnam Over a year ago

@user3024194 You can just use @buy and @sell.

Max Wong · Accepted Answer · 2013-12-23 05:13:43Z

2

Two ways:

Write the code in application_controller as before_filter, and use the variables in nav bar.

before_filter :prices

def prices

@buy = coinbase.buy_price

@sell = coinbase.sell_price

end
Write the code in application.html.erb, just before the nav bar code:

<% @buy = coinbase.buy_price %>

<% @sell = coinbase.sell_price %>

And use them directly.

answered Dec 23, 2013 at 5:13

Max Wong

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