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HOW TO USE THE RAILS WHERE METHOD (WITH EXAMPLES) How to Use The Rails Where Method (With Examples) In Rails, you can query the database through your models to access your data. You can do this using ActiveRecord methods. Like where, find, or find_by. With where, an ActiveRecord::Relation object. With find, a single record, found by its primary column (usually id ), raises an exception if not HOW TO USE RAILS LINK_TO METHOD (WITH EXAMPLES) THE BEGINNERS GUIDE TO RUBY IF & ELSE STATEMENTS Notice that we use two equal == symbols to mean equality!. One equals sign = in Ruby means “assignment”, make sure to use == when you want to find out if two things are the same.. If you don’t this right you won’t get the expected results. Ruby Unless Statement. With an if statement you can check if something is true.. But when you want to check for the opposite “not true” (false HOW TO USE FLASH MESSAGES IN RAILS What are flash messages? A flash message is a way to communicate information with the users of your Rails application so they can know what happens as a result of their actions. Example messages: "Password changed correctly" (confirmation) "User HOW TO USE THE RUBY SELECT METHOD (WITH EXAMPLES) You can use the select method in Ruby to filter an array of objects. For example, you can find all the even numbers in a list. Without select that looks like this: even_numbers = .each do
|n|
RUBY HASH METHODS: THE ULTIMATE GUIDE What is a Ruby hash? A hash is a data structure used to store data in the form of UNIQUE key-value pairs. Unlike arrays, there are no numerical indexes, you access the hash values with keys. Examples include:. A list of country names & their corresponding country codes(like ES ⇾ Spain)
HOW TO USE THE RUBY GETS & RUBY CHOMP METHODS name = gets.chomp puts "Hello # {name}, nice to meet you!" The # {name} thing is called string interpolation. Give this a try & see for yourself how it works. First, save this code into a “greeting.rb” file. Then, use it with “ruby greeting.rb” (from a terminal program) Enter your name & HOW TO USE SCOPES IN RUBY ON RAILS (COMPLETE GUIDE)SEE MORE ONRUBYGUIDES.COM
HOW TO USE THE RUBY TERNARY OPERATOR (?:) HOW TO READ & PARSE CSV FILES WITH RUBY CSV stands for "Comma-Separated Values". It's a common data format which consist of rows with values separated by commas. It's used for exporting & importing data. For example: You can export your Gmail contacts as a CSV file, HOW TO USE THE RAILS WHERE METHOD (WITH EXAMPLES) How to Use The Rails Where Method (With Examples) In Rails, you can query the database through your models to access your data. You can do this using ActiveRecord methods. Like where, find, or find_by. With where, an ActiveRecord::Relation object. With find, a single record, found by its primary column (usually id ), raises an exception if not HOW TO USE RAILS LINK_TO METHOD (WITH EXAMPLES) THE BEGINNERS GUIDE TO RUBY IF & ELSE STATEMENTS Notice that we use two equal == symbols to mean equality!. One equals sign = in Ruby means “assignment”, make sure to use == when you want to find out if two things are the same.. If you don’t this right you won’t get the expected results. Ruby Unless Statement. With an if statement you can check if something is true.. But when you want to check for the opposite “not true” (false HOW TO USE FLASH MESSAGES IN RAILS What are flash messages? A flash message is a way to communicate information with the users of your Rails application so they can know what happens as a result of their actions. Example messages: "Password changed correctly" (confirmation) "User HOW TO USE THE RUBY SELECT METHOD (WITH EXAMPLES) You can use the select method in Ruby to filter an array of objects. For example, you can find all the even numbers in a list. Without select that looks like this: even_numbers = .each do|n|
RUBY HASH METHODS: THE ULTIMATE GUIDE What is a Ruby hash? A hash is a data structure used to store data in the form of UNIQUE key-value pairs. Unlike arrays, there are no numerical indexes, you access the hash values with keys. Examples include:. A list of country names & their corresponding country codes(like ES ⇾ Spain)
HOW TO USE THE RUBY GETS & RUBY CHOMP METHODS name = gets.chomp puts "Hello # {name}, nice to meet you!" The # {name} thing is called string interpolation. Give this a try & see for yourself how it works. First, save this code into a “greeting.rb” file. Then, use it with “ruby greeting.rb” (from a terminal program) Enter your name & HOW TO USE SCOPES IN RUBY ON RAILS (COMPLETE GUIDE)SEE MORE ONRUBYGUIDES.COM
HOW TO USE THE RUBY TERNARY OPERATOR (?:) HOW TO READ & PARSE CSV FILES WITH RUBY CSV stands for "Comma-Separated Values". It's a common data format which consist of rows with values separated by commas. It's used for exporting & importing data. For example: You can export your Gmail contacts as a CSV file, THE BEGINNERS GUIDE TO RUBY IF & ELSE STATEMENTS Notice that we use two equal == symbols to mean equality!. One equals sign = in Ruby means “assignment”, make sure to use == when you want to find out if two things are the same.. If you don’t this right you won’t get the expected results. Ruby Unless Statement. With an if statement you can check if something is true.. But when you want to check for the opposite “not true” (false HOW TO USE THE RUBY SELECT METHOD (WITH EXAMPLES) You can use the select method in Ruby to filter an array of objects. For example, you can find all the even numbers in a list. Without select that looks like this: even_numbers = .each do|n|
HOW TO USE RAILS HELPERS (COMPLETE GUIDE) A helper is a method that is (mostly) used in your Rails views to share reusable code. Rails comes with a set of built-in helper methods. One of these built-in helpers is time_ago_in_words. This method is helpful whenever you want to display time in this specific format. Another Rails view helper is number_to_human. THE DEFINITIVE RSPEC TUTORIAL WITH EXAMPLES 1.0.1 It builds a safety net against errors (especially useful for refactoring) 1.0.2 It helps document your code. 1.0.3 It gives you a feedback loop. 1.0.4 It helps you make sure your code is producing the results you expect. 1.0.5 It helps you land a Ruby job. 2 Getting Started With RSpec. 3 RSpec Testing Example. HOW TO WORK WITH DIRECTORIES IN RUBY filenames = Dir.entries (".") filenames = Dir.entries (".") This entries method returns an array of filename entries. Every entry is a string, so you’ll need to combine this with the Ruby File class if you want to actually read these files. Btw, this dot (.) represents the current directory. This will be the directory your code is running 7 INTERESTING RUBY CODE EXAMPLES Nazar says a couple of years ago . Great article! IMHO, in the first example can be used #combination(2) (instead of arr.product(arr).reject(&block)). It also helps to reject such pairs like and , as they will produce the same result HOW TO USE THE RUBY TERNARY OPERATOR (?:) What is a ternary operator in Ruby? A ternary operator is made of three parts, that’s where the word “ternary” comes from. These parts include a conditional statement & two possible outcomes.. In other words, a ternary gives you a way to write a compact if/elseexpression in
HOW TO SORT ARRAYS & HASHES IN RUBY (EXAMPLES INCLUDED) Summary. You have learned how to use the sort & the sort_by methods to sort your arrays & hashes in different ways. You have also learned about the performance differences & how to implement the quicksort algorithm. Here’s what you should remember: WHAT IS RAKE IN RUBY & HOW TO USE IT Rake centralizes access to your tasks. Rake also makes a few things easier, like finding files that match a certain pattern & that have been modified recently. One more thing: Don’t confuse Rake with Rack, very similar names, but completely different things. Rake is a task runner. Rack helps Ruby servers & frameworks work together. HOW TO USE THE SINGLETON PATTERN IN RUBY (AND WHY YOU The idea of the singleton pattern is that you want a class with only one instance. Here’s how: You make the new method private. You define a class method named instance that returns the unique instance for the class. Because this is a popular design pattern, the Ruby standard library comes with a Singleton module you can include in anyclass.
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Would you like to become an awesome Ruby developer that is happy, confident & proud of his work? CLICK THE BUTTON below to GET MY BEST CONTENT so you can start improving your Ruby skills now! Yes! Help Me Improve My Ruby Skills How to Use The Ruby Uniq Method To Remove Duplicates With the uniq method you can remove ALL the duplicate elements from an array. Let's see how it works! IfRead More
Ruby Infinity: How It Works & Why It Matters What is infinity in Ruby? It's something that has a starting point but no ending. In Ruby, we can expressRead More
How to Use The Rails Where Method (With Examples) In Rails, you can query the database through your models to access your data. You can do this using ActiveRecordRead More
String Concatenation & Interpolation in Ruby (With Examples) Combining multiple strings together is something that you have to do often in Ruby. But how can you do that?Read More
3 Awesome Ways To Use Ruby’s Gsub Method Let's talk about Ruby's gsub method. First, you'll need a string to play with this method. Why? Because you useRead More
Read This If You Want to Understand Instance Variables in Ruby If you want to learn about Ruby instance variables, how they work & why they're useful. You're in the rightRead More
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How to Use The Ruby Sequel Gem (With Examples) What is Sequel? Sequel is a gem that allows you to access your database, no Rails required. You can connectRead More
How to Write Your Own Ruby Methods (Complete Guide) What is a Ruby method? A method is made of lines of Ruby code grouped together with one specific goal.Read More
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Understanding Ruby: String Encoding, ASCII & Unicode How can strings of characters exist in a world where computers only understand ones & zeros? Well... Just like weRead More
How to Use Ruby’s FFI Module to Play MP3 Files I want to answer one simple question... What is FFI in Ruby? FFI stands for "Foreign Function Interface". It's aRead More
How to Use Rails link_to Method (With Examples) Ah, yes. The link_to method. One of the most common helper methods you'll use in your Rails applications. But howRead More
How to Create Temporary Files in Ruby Creating a temporary file gives you an empty file with a random name inside your O.S. (Operating System) temporary folder.Read More
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