![]() This one allows to navigate safely through the layers of objects relations.īasically, let’s say that we have a company with only one employee and that this employee has a name and an email address: class Company attr_reader :employee def initialize ( employee ) = employee end end class Person attr_reader :name, :email def initialize ( name, email ) = name = email end end bobby = Person. number = 10 nil_variable = nil nil_variable ||= number # => 10 -> nil_variable is now set to 10 false_variable = false false_variable ||= number # => 10 -> false_variable is now set to 10 not_defined_variable ||= number # => 10 -> not_defined_variable is now set to 10 content = "I already have some content" content ||= number # => "I already have some content" -> The content variable is not reassigned and keeps its initial value Safe navigation operator: & The concept is fairly simple and can be very useful in a variety of situations.īasically using ||= allows you to perform a variable assignment if and only if the variable is not yet defined or if its value is currently falsey ( nil or false). 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. ![]() 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. I am working with the macOS Big Sur version - 11.0.1 for development in Android Studio version 4.1 and Testing that application in iPad(6th generation) version 14.2.Ĭan anyone please assist me with what I am doing wrong? so further I can able to resolve this error in iOS.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. In this podfile, I have removed pods because of occurring some issues which I mentioned above. Installer.pods_ do |target|įlutter_additional_ios_build_settings(target) Require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)įlutter_install_all_ios_pods File.dirname(File.realpath(_FILE_)) Try deleting Generated.xcconfig, then run flutter pub get" Unless File.exist?(generated_xcode_build_settings_path) Generated_xcode_build_settings_path = File.expand_path(File.join('.', 'Flutter', 'Generated.xcconfig'), _FILE_) Android toolchain - develop for Android devices (Android SDK version 29.0.3) Flutter (Channel stable, 2.0.6, on macOS 11.0.1 20B50 darwin-圆4, locale en-US) = This is my Flutter Doctor response:- Doctor summary (to see all details, run flutter doctor -v): I had also used some solution which is a reference on Github but still, those thing is not working. ![]() Searching for inspections failed: undefined method `map' for nil: NilClass " Looking for related issues on cocoapods/cocoapods. " Don't forget to anonymize any private data! I have also installed a cocoapod but it was not working properly, that time I also face another issue which is mention below:. Searching for inspections failed: undefined method `map' for nil: NilClass Everything is working smoothly in Android but when I run this application in an iOS environment, I am facing some issues like, I am using Firebase Auth, Firebase Messaging, Google Sign in, and Cloud Firestore. I am working on the Flutter application which is based on a simple Chat.
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