to_param(method_name = nil)
Instance Public methods
Defines your model's to_param method to generate âprettyâ
URLs using method_name, which can be any attribute or method
that responds to to_s.
class User < ActiveRecord::Base to_param :name end user = User.find_by(name: 'Fancy Pants') user.id # => 123 user_path(user) # => "/users/123-fancy-pants"
Values longer than 20 characters will be truncated. The value is truncated word by word.
user = User.find_by(name: 'David HeinemeierHansson') user.id # => 125 user_path(user) # => "/users/125-david"
Because the generated param begins with the record's id,
it is suitable for passing to find. In a controller, for
example:
params[:id] # => "123-fancy-pants" User.find(params[:id]).id # => 123
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