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TechTip: Riding the Rails, Part 2

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Go further into the Rails generators and Convention over Configuration. It just keeps getting better. Saving time never felt so good.

In the January 2016 article "Riding the Rails, Part 1," I introduced you to how a Rails project is created. We walked through the various files and directories that were generated. We also made it through starting the Rails web server and ended with being able to see a "Hello World" type of screen. In this article, we'll pick up where we left off by generating a Create, Read, Update, Delete (CRUD) application.

We'll be using the rails generate scaffold command to create the CRUD application. The Rails Guides documentation describes scaffolding as follows:

A scaffold in Rails is a full set of model, database migration for that model, controller to manipulate it, views to view and manipulate the data, and a test suite for each of the above.

The CRUD application will be for maintaining a very simple customer table with columns for first/last name and address. Below is the rails generate scaffold command being run and the corresponding output.

$ rails generate scaffold customer first_name:string last_name:string address:string city:string state:string zip:integer

     invoke active_record

     create   db/migrate/20160130001913_create_customers.rb

     create   app/models/customer.rb

     invoke   test_unit

     create     test/models/customer_test.rb

     create     test/fixtures/customers.yml

     invoke resource_route

       route   resources :customers

     invoke scaffold_controller

     create   app/controllers/customers_controller.rb

     invoke   erb

     create     app/views/customers

     create     app/views/customers/index.html.erb

     create     app/views/customers/edit.html.erb

     create     app/views/customers/show.html.erb

     create     app/views/customers/new.html.erb

     create     app/views/customers/_form.html.erb

     invoke   test_unit

     create     test/controllers/customers_controller_test.rb

     invoke   helper

     create     app/helpers/customers_helper.rb

     invoke     test_unit

     create       test/helpers/customers_helper_test.rb

     invoke   jbuilder

     create     app/views/customers/index.json.jbuilder

     create     app/views/customers/show.json.jbuilder

     invoke assets

     invoke   coffee

     create     app/assets/javascripts/customers.js.coffee

     invoke   scss

     create     app/assets/stylesheets/customers.css.scss

     invoke scss

     create   app/assets/stylesheets/scaffolds.css.scss

Let's dissect the command that was run.

First, we have the rails command. It's important to know that each level of these commands has its own "help" to gain insight about the syntax. For example, here are the commands to run to get help at each of the levels:

$ rails --help

$ rails generate --help

$ rails generate scaffold --help

The scaffold portion of the command requires we pass the name of the model as the first parameter, in this case customer. The "model" is what communicates to the DB2 table and also where we can store additional code relating to customers (business logic). After the model name come the columns and their data types, separated by a colon. The data types of string and integer correlate to data types in the ActiveRecord ibm_db adapter, maintained by IBM and KrengelTech as an open-source project on Bitbucket. You can see the specific lines of code doing the correlation here.

Going back to the output, created first is db/migrate/20160130001913_create_customers.rb, which holds what's called a database migration, a way to record the changes needing to be done to the database. We will be covering database migrations in a subsequent article.

Next we see file app/models/customer.rb created, shown below.

---- app/models/customer.rb ----

class Customer < ActiveRecord::Base

end

As you can see, there isn't much to it. That's the beautiful part! This is Convention over Configuration, discussed in the first article, at its best. When we start the Rails server, it will make a query to the DB2 customer table, asking for the column meta data. It will then dynamically insert code into the customer.rb model so we can access each column. This is called Ruby open classes. It’s a phenomenally powerful feature because it keeps you from having to manually enter and subsequently maintain code in the model. In short, a very big timesaver.

Next in the output, we have test/models/customer_test.rb and test/fixtures/customers.yml that are created for unit testing purposes. The goal is for every time you create a method in app/models/customer.rb, a unit test in test/models/customer_test.rb should also be created. Every time someone doesn't write a unit test, a politician lays an egg. So let's write some unit tests!

Next in the output, we have resources :customers being added as what's called a route. This means that line was added in the config/routes.rb file to configure how inbound requests should be mapped to your Ruby code. Think of this as being similar to an RPG green-screen program that needs to route processing based on the key a user selects. So if the user presses the F4 key, you would EXSR to CUSTPRMPT, for example. More on routing in future articles.

Next in the output, we have app/controllers/customers_controller.rb which is the controller. The controller facilitates deciding what should be done based on the user's input. For example, when a user submits an HTML form to add a customer row to the database, the controller will receive in the form, call on the validation routines, and, depending on the validation success or failure, redirect the user accordingly.

Next in the output we have the views, as shown below.

app/views/customers/index.html.erb

app/views/customers/edit.html.erb

app/views/customers/show.html.erb

app/views/customers/new.html.erb

app/views/customers/_form.html.erb

The views are similar in nature to *DSPF DDS in RPG. It's where screen definitions are defined. But here, HTML is used instead of DDS. As you can see, there are five different files, each serving a CRUD purpose. File index.html.erb displays a listing of existing customers. File edit.html.erb shows a form to edit an existing customer. File show.html.erb is for (you guessed it) conveying a customer's information in read-only fashion. File new.html.erb is for creating a new customer. The last one, _form.html.erb, is what's called a "partial." Partials are named with an underscore as their first charactera convention of Rails. A partial is a lot like a copy book in RPG: a way to modularize code for reuse in other source files. In this case, _form.html.erb is used in both edit.html.erb and new.html.erb because they both need to display the same HTML form fields, just in a different scenarioediting a customer vs. creating a new one.

Next in the output, we have test/controllers/customers_controller_test.rb, which is another unit-testing skeleton, this time for the controller portion of the customer CRUD application.

Next in the output, we have app/helpers/customers_helper.rb, which is a place to put code that doesn't necessarily belong in the model layer (because it has to do with the view layer). You don't want to put it into the view layer because it would just muddy the code and make it hard to read. For example, let's say you wanted to display a customer's credit in red if they were nearing the danger zone. Something like that would go in a helper because you wouldn't want HTML in your model. You also wouldn't want the "if" statement logic muddying up your view layer.

Next in the output, we have app/views/customers/index.json.jbuilder and app/views/customers/show.json.jbuilder, which are used to offer up the same data as a normal HTML view but instead as a JSON response. For example, if the browser invokes URL http://domain.com/customers, it will return an HTML listing of customers. But if the browser invokes URL http://domain.com/customers.json, it will return a JSON listing of customers. No logic on the server side needed to change. This is obviously great for when you need to offer web services (e.g., AJAX requests from the browser).

Last up in the output, we have app/assets/javascripts/customers.js.coffee and app/assets/stylesheets/customers.css.scss. These are used to store your coffee scripts and sass scripts, respectively. To be honest, I don't use coffee script that much and instead prefer raw JavaScript. Sass on the other hand has seemingly caught on better in the broader web community (e.g., the popular UI framework BootStrap uses it) so I do use that. Coffee script essentially makes JavaScript more concise to write. Sass is an extension to CSS where CSS lacks certain features like variables, modularity for reuse, etc. This is definitely necessary as CSS continues to grow in complexity and prominence. The coffee script and sass are converted to JavaScript and CSS before they're sent to the browser.

OK, now it's time to see the app that was created with the rails generate scaffold command. Use the rails server command to start the server, as shown below. The -p60128 is specifying a specific port if you don't want the default of 3000.

$ rails server -p60128

NOTE: Make sure you are in the root of the Rails project's folder when you are running rails commands.

Now open your browser and enter the IP address of your IBM i and the port you specified, and you should see the error shown in Figure 1.

 

021216Bartell-Figure1-rakedbmigrate

Figure 1: Pending database migrations

This error is conveying another very cool feature of Ruby on Rails. When we started the server, it made an SQL query to table SCHEMA_MIGRATIONS to check and see if there were any migrations in our application folder db/migrate that hadn't yet been invoked on the database. In this case, it recognized that database migration 20160130001913_create_customers.rb hadn't yet been run and informed us accordingly in the browser error. To remedy the issue, we can run the below rake db:migrate command.

$ rake db:migrate

== 20160130001913 CreateCustomers: migrating ==================================

-- create_table(:customers)

   -> 0.3369s

== 20160130001913 CreateCustomers: migrated (0.3371s) =========================

The rake db:migrate command does the same SQL query to SCHEMA_MIGRATIONS to check for migrations that need to be run. We can see it found the CreateCustomers migration and executed it against the database, effectively creating the CUSTOMERS table with an SQL CREATE TABLE statement.

Now start the Rails server again and direct your browser to http://ibmi_ip:port/customers to see the result in Figure 2.

 

021216Bartell-Figure2-customerlisting

Figure 2: Customer listing page

By specifying /customers in the URL, and given the entry in routes.rb, the Rails web server knew to route the request to the index Ruby method in the customers_controller.rb file, as shown below.

def index

   @customers = Customer.all

end

What you see above is Ruby code that's making a request to DB2 using the following SQL syntax.

SELECT customers.* FROM customers

What's interesting about the index Ruby method is it doesn't declare what HTML file should be conveyed back to the browser. This is "Convention over Configuration" happening again. If you don't specify a specific HTML file to render the results, then Rails will use the default. The default is to look for a file with the same name as the method (e.g., index.html.erb) in the folder with the same name as the controller (e.g., app/views/customers). This was initially frustrating to me because I came from a more raw RPG-CGI background where I had to do everything. I've grown to greatly appreciate these various conventions because they really do save time.

Select the "New Customer" link and you will see the screen in Figure 3.

 

021216Bartell-Figure3-newcustomerform

Figure 3: Add a new customer

Notice the "/new" portion at the end of the URL? Again, that helps Rails to know which controller method to route this request to. If you look inside customers_controller.rb, you can see it has a new Ruby method. We won't digress into that right now, but know Figure 3 is the new.html.erb file being rendered in the browser, using the _form.html.erb partial for the form.

Filling out the form and selecting the "Create Customer" button produces the screen in Figure 4.

 021216Bartell-Figure4-displaynewcustomer

Figure 4: Showing the created customer

File show.html.erb is used to convey the page in Figure 4. You'll notice the "/1" at the end of the URL. This is the unique surrogate (not composite) key for the CUSTOMERS table.

Selecting the "Back" link will take you back to the customer listing, as shown in Figure 5.

021216Bartell-Figure5-customerlistingwithdata

Figure 5: Customer listing with data

I could go on further, but eventually this article needs to end. Right?

There's so much more to cover from what was created with the rails generate scaffold command. We’ll pick up where we left off in next month's article.

If you have any specific questions please let me know in the comments or reach me directly at This email address is being protected from spambots. You need JavaScript enabled to view it..

Aaron Bartell

Aaron Bartell is Director of IBM i Innovation for Krengel Technology, Inc. Aaron facilitates adoption of open-source technologies on IBM i through professional services, staff training, speaking engagements, and the authoring of best practices within industry publications andwww.litmis.comWith a strong background in RPG application development, Aaron covers topics that enable IBM i shops to embrace today's leading technologies, including Ruby on Rails, Node.js, Git for RPG source change management, and RSpec for unit testing RPG. Aaron is a passionate advocate of vibrant technology communities and the corresponding benefits available for today's modern application developers. Connect with Aaron via email atabartell@krengeltech.com.

Aaron lives with his wife and five children in southern Minnesota. He enjoys the vast amounts of laughter that having a young family brings, along with camping and music. He believes there's no greater purpose than to give of our life and time to help others.

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    Profound Logic Software, Inc.Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using NodeRun.com as a pre-built development environment

     

     

  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.