Question

country attribute’s default value is nil.

In countries table, some record has image_url, and the rest of the record’s country attributes are nil.

So I coded this in helper

def image(user)
    if user.country.image_url
        image_tag "flags/#{user.country.image_url}.png" 
    end
end

However, it returns error when image_url was nil

Something went wrong

How can I fix?

Answer 1

You’ll need two conditions: The user has to have a country, and that country has to have an image_url. Only then will there be something to show. Luckily, it’s a simple tweak:

def image(user)
    if(user.country && user.country.image_url)
        image_tag "flags/#{user.country.image_url}.png" 
    end
end

If you’re paranoid, you should make sure that user isn’t nil either.

Hope that helps!