问题
I was wondering if I could execute / display some stuff differently in partials depending on the context in which it appears.
For example, I have a _user_info partial that appears in a sidebar, and also in the user page, and I want to display some extra info in the second case. How can I express that kind of conditions?
回答1:
What you're asking for is something this:
if params[:controller].eql?('users')
view code
However I would split the partial into two separate partials and display the distinct parts from whichever view you need.
回答2:
You can use controller_name and action_name methods.
if controller_name == 'user' && action_name == 'show'
details
end
回答3:
Sure, it just depends on how you want to discover/expose that context. The simple way is conditionals, which can be set in any number of ways, or derived from a set of conditions. That can happen in a filter, an action, etc.
If the changes are large enough, better to just encapsulate them in separate partials.
Another option is to wrap the render tag in a helper that calculates/grabs those conditions.
It kind of depends on the nature of the conditions, where/how you want to deal with them, etc.
回答4:
Or pass a variable into the partial via :locals =>
来源：https://stackoverflow.com/questions/7455215/conditional-in-rails-partial-depending-on-the-context-page