Can i use variable for Rails link_to helper for making different link with variables?

For example, <%= link_to users, users_path %> I have link like this,

And i'd like to change this url with variable examples

So i changed url like this, <%= link_to users, "#{examples}_path" %> This not worked because of whole string change to url.

How can i change my link_to for use this with different variable for DRY codes?

CodePudding user response：

What you're asking is really just how to perform dynamic method calls. In Ruby you can do it with send (and public_send):

<%= link_to users, send("#{examples}_path") %>

The difference between the two is that send will let you violate encapsulation and call private/protected methods.

You can also do it by calling call on the Method object:

<%= link_to users, method("#{examples}_path".to_sym).call %>

However you most likely don't even need this it in the first place. Just use the polymorphic routing helpers to create links from models:

# a link to show whatever resource happens to be
<%= link_to resource.name, resource %>

<%= link_to "Edit", edit_polymorphic_url(resource) %>
<%= link_to "New", new_polymorphic_url(resource_class) %>
<%= link_to "Frobnobize", polymorphic_url(resource, :frobnobize) %>

# a link to the index 
<%= link_to resource_class.model_name.plural, resource_class %>

These all use a set of heuristics to figure out what the corresponing path helper is and then call it dynamically with send.

Or if you want to link to a specific controller or action just use the functionality provided by url_for:

# link to a specific controller action
<%= link_to "Baz", { controller: :foo, action: :bar } %>

# Will use the current controller 
<%= link_to "Baz", { action: :bar } %>