rails partial check if local exists
To check if a local variable exists in a Rails partial, you can use the defined?
keyword. Here's how you can do it:
Step 1: Open the Rails partial where you want to check if a local variable exists.
Step 2: Use the defined?
keyword followed by the local variable name.
Step 3: If the local variable exists, it will return the value of the variable. If it doesn't exist, it will return nil
.
Here's an example of how you can use the defined?
keyword in a Rails partial:
<% if defined?(my_variable) %>
<p>The value of my_variable is: <%= my_variable %></p>
<% else %>
<p>my_variable does not exist.</p>
<% end %>
In this example, we first check if the my_variable
local variable is defined using defined?(my_variable)
. If it exists, we display its value in a paragraph tag. If it doesn't exist, we display a message saying that it does not exist.
I hope this explanation helps! Let me know if you have any further questions.