When I got started I didn’t know about ruby’s double pipe equals: ||=. These methods cannot be directly called on an instance of the class such as: fine_activity which would return an error NoMethodError: protected method 'define_activity' called for # ||= assignment NB: Please note that the protected method can here be called on instances of the class but only within the class definition body. define_activity end protected def define_activity ||=. def same_activity_as? ( other_animal ) define_activity = other_animal.
#Rails find by undefined method map code#
In order for the above code not to break we can make the define_activity method protected instead of private and everything will work just fine: class Animal. same_activity_as? ( bobby ) # => NoMethodError: private method `define_activity' called for # define_activity end private def define_activity ||=. For instance it would be useful to be able to do that: class Animal. current_activity # => NoMethodError: private method `define_activity' called for #īeing able to do so could be especially handy if you wanted to call it on other instances of your class passed as method arguments. The dig method can be used on hashes (and Arrays) to, as its name suggests, dig through the potential multiple layers in the object and retrieve the value corresponding to the argument provided to the method.īy using dig you find yourself able to nicely shorten your code and improve overall readability: # Let's consider the following hash structure user_info = " end private def define_activity ||=. Since I got started at Drivy, I have discovered several ruby tricks that helped me make my code more readable and efficient.
#Rails find by undefined method map professional#
Undefined method with rails runner (CC BY‑SA 3.0/4.As a junior developer who started his professional coding journey fairly recently I realized that I only used a limited number of methods and ruby capabilities.Runner "n", :output => '/Users/bl0b/Projects/crawler/cron.log'Īnd in my app/models/crawler.rb I have the following code: class Crawler '/Users/bl0b/Projects/crawler/cron.log' I have the following code in my shedule.rb : set :environment, 'development'
使用 rails runner 的未定義方法 (Undefined method with rails runner)
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