ActionView::Template::Error

ActionView::Template::Error wraps errors that occur during template rendering. The original error (NoMethodError, NameError, etc.) is wrapped to include template context.

Common causes

• Calling method on nil in view
• Undefined variable in template
• Helper method raising error
• Partial rendering failure
• Invalid ERB syntax

How to fix it

• Check the original error in the cause
• Use safe navigation in views: @user&.name
• Add nil checks before accessing objects
• Verify instance variables are set in controller
• Check helper methods for errors

Example

# Error in view
<%= @user.name %>  # When @user is nil
# => ActionView::Template::Error: undefined method 'name' for nil:NilClass

# Fix with safe navigation
<%= @user&.name %>

# Fix with conditional
<%= @user.name if @user %>

# Fix with try
<%= @user.try(:name) %>

# Check in controller
def show
  @user = User.find_by(id: params[:id])
  redirect_to root_path, alert: "User not found" unless @user
end

Related errors