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WEBAPPLOG [TECH BLOG]
Book author Azat Mardan writes about apps, startups and technology
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ADDING CONSTRAINT ON A FOREIGN KEY WITH NODE-PG-MIGRATION
node-pg-migration is a useful library. You can add a constraint of a foreign key
with a simple references property on the column. For example, you have table
client_session with publishable_key column and you want to reference
publishable_key column in workspace table where it is not a primary key (just a
unique key). The following usage with object: schema, name, won’t work:
pgm.createConstraint({
schema: "seam",
name: "client_session",
}, "client_session_publishable_key_fkey", {
foreignKeys: {
columns: "publishable_key",
references: {
schema: "seam",
name: "workspace",
},
},
})
If you write a migration for Postgress and Node.js using node-pg-migration
(e.g., table 1) and want to create a foreign key reference / constraint
(createConstraint or references on createTable) on a non-primary key of the
other table (table 2), then references by an object containing schema and table
name, do not work. This is probably a bug in node-pg-migration. It tries to
match primary keys only, but our publishable_key is not a PK in workspace.
It looks like node-pg-migration is not smart enough to add the column/field name
like it does for primary keys. You can use a string (seam.table2(col)) as the
references value, not an object, or just use raw SQL to bypass node-pg-migration
behavior, e.g.,
pgm.sql(`
ALTER TABLE seam.client_session
ADD CONSTRAINT client_session_publishable_key_fkey
FOREIGN KEY (publishable_key) REFERENCES seam.workspace(publishable_key);
`)
Or in the node-pg-migration method:
pgm.createConstraint({
schema: "seam",
name: "client_session",
}, "client_session_publishable_key_fkey", {
foreignKeys: {
columns: "publishable_key",
references: "seam.workspace(publishable_key)"
},
})
},
Author AzatPosted on April 17, 2023April 17, 2023Categories Advices, Node.js,
Postgres, TutorialsLeave a comment on Adding constraint on a foreign key with
node-pg-migration
HOW TO SHOW ALL CONSTRAINTS ON A POSTGRES TABLE
I recently needed to update the check constraint on a Postgres table column.
This check does format validation similar to regex. This check was part of the
CREATE TABLE statement meaning it was created with the table.
However, ALTER COLUMN is not supporting updates of checks. So what we need to do
is to drop the constraint and create a new one. dropConstraint requires the name
of the constraint, but the name is not obvious. This is because check was create
with createTable. To find the name, there’s a SQL query we can run:
SELECT con.*
FROM pg_catalog.pg_constraint con
INNER JOIN pg_catalog.pg_class rel
ON rel.oid = con.conrelid
INNER JOIN pg_catalog.pg_namespace nsp
ON nsp.oid = connamespace
WHERE nsp.nspname = '<schema name>'
AND rel.relname = '<table name>';
Author AzatPosted on April 17, 2023April 17, 2023Categories Advices, Node.js,
Postgres, TutorialsLeave a comment on How to show all constraints on a Postgres
table
LEVERAGING MESSENGERS FOR MVP VALIDATION AND SALES IN YOUR TECH/IT STARTUP
As a startup founder, you might think that building an app, whether it’s for the
web or mobile, is the only way to validate your business idea. However, that’s
not necessarily the case. In fact, using messenger apps like WhatsApp or
Telegram can be a great way to test the waters and validate your concept with
minimal resources.
In most cases, startup founders don’t need to build apps (web nor mobile) to
validate their ideas. For a minimum viable product (MVP), it’s good enough to
“fake it till you make it” with a manual service by a human over a messenger.
This is because even non-MVPs use it.
I’ve ordered cakes, cigars, flowers, meat, taxi, nanny, cleaning and many other
products and services over WhatsApp. I’ve paid in my banking apps, after I got
the payment info via WhatsApp. I’ve scheduled personal trainers, car services
and others via WhatsApp and then paid cash.
In fact, there are already many industry use cases where messenger apps are
being used to provide products and services. If you think about it, Uber, Rappi
and Instacart often rely on messages to confirm destination or replacements of
grocery products. The core of their app is catalog and messaging which can be
done in WhatsApp or Telegram. Catalog can be done for the MVP with a PDF or just
images sent over the messenger.
Let’s say your MVP is not an e-commerce where clients pick a product form a
catalog and make an order. It’s something more complicated. Then you do the
complex thing manually by a human and get results via messenger.
In the end, don’t waste time and money on building web or mobile apps. Just
validate and make sales with WhatsApp or Telegram first.
Author AzatPosted on April 1, 2023April 1, 2023Categories Lean StartupLeave a
comment on Leveraging Messengers for MVP Validation and Sales in Your Tech/IT
Startup
WHAT’S NEW IN REACT 17: NEW FEATURES AND IMPROVEMENTS
React.js version 17 was released in October 2020 and introduced several new
features and improvements. In this blog post, we’ll explore the major updates in
React.js version 17.
NO MORE EVENT POOLING
One of the most significant changes in React.js version 17 is the removal of the
event pooling optimization. Previously, React.js used a technique called “event
pooling” to reduce the number of event objects created by the browser. However,
this technique had some drawbacks, such as preventing the use of asynchronous
event handlers and making the code more difficult to reason about.
With React.js version 17, the event pooling optimization has been removed, and
every event object is now a unique instance. This change allows developers to
use asynchronous event handlers and makes it easier to reason about the behavior
of event handling in React.js.
Continue reading “What’s new in React 17: new features and improvements”
Author AzatPosted on March 9, 2023March 9, 2023Categories JavaScriptTags
react.jsLeave a comment on What’s new in React 17: new features and improvements
MMAT: MY TEACHING AND LEARNING APPROACH
In our day and age, learning is more important than ever because things change
so rapidly. I learned a taught a lot of things during my career which led me to
discover that the best and the most effective learning method is to use MMAT:
Motivation, Methodology, Action and Time.
Continue reading “MMAT: My Teaching and Learning Approach”
Author AzatPosted on January 31, 2020October 19, 2022Categories JavaScriptLeave
a comment on MMAT: My Teaching and Learning Approach
WHY I’M GETTING A SECOND MASTER’S DEGREE FROM HEC PARIS
Two months ago, I applied and was accepted to a master’s program at a
prestigious business school (ranked #2), HEC Paris. The degree is title Master
of Science in Innovation and Entrepreneurship (MSIE). It has 10 normal courses,
10 practical project-based courses and one large team project. The master’s
program lasts about one year and a half. Thus the program ends in 2020. However
the graduation will be in 2021, because HEC has only one graduation ceremony
which is held in its beautiful Paris campus.
Continue reading “Why I’m Getting a Second Master’s Degree from HEC Paris”
Author AzatPosted on August 11, 2019October 19, 2022Categories StartupsLeave a
comment on Why I’m Getting a Second Master’s Degree from HEC Paris
ACQUISITION OF NODE UNIVERSITY BY DEVELOPINTELLIGENCE
After 2.5 years of starting my online school for software engineers Node
University and growing it to one of the best resources on Node.js, APIs and AWS,
I’m happy to announce the acquisition of Node University by the tech training
company DevelopIntelligence. I’ve known and worked with DevelopIntelligence for
many years. They deliver outstanding in-person tech training to Fortune 500
companies. The synergies and future of combining in-person with online training
are massive. I’m sure the new team will take Node University to the next level!
Author AzatPosted on June 3, 2019October 3, 2019Categories JavaScriptLeave a
comment on Acquisition of Node University by DevelopIntelligence
AZAT’S MANAGEMENT PHILOSOPHY
Have you ever wondered what your manager is doing all day? Are you guilty of
secretly thinking he/she is playing Candy Crash and attending endless stream of
useless meetings? If yes, then you are normal. Management is often invisible and
hard to understand. We have tons of books and courses on management but too few
good leaders. Sadly, many of us had a bad boss and too of us had a great boss.
This post will share my approach to being a good leader.
My management philosophy revolves around three things but one of them is the
most important because if we get it right, then all other parts will fall into
place. One thing that I care about the most, and which is my main job, is
people. I coach, mentor and help people to grow in their careers. I find their
strengths and talents. Most people are not that great at self awareness and self
observation because their insecurities, desires or emotions interfere with the
clear perception of reality. Observing people from outside as a manager or peer
gives much better results—a much cleaner and fuller picture.
Continue reading “Azat’s Management Philosophy”
Author AzatPosted on March 6, 2019March 6, 2019Categories LeadershipLeave a
comment on Azat’s Management Philosophy
WHY GRAPHQL IS TAKING OVER APIS
A few years ago, I managed a team at DocuSign that was tasked with re-writing
the main DocuSign web app which was used by tens of millions of users. The APIs
didn’t exist yet to support our new shiny front-end app because since the
beginning the web app was a .NET monolith. The API team in Seattle was taking
the monolith apart and exposing RESTful APIs slowly. This API team consisted of
just two engineers and had a release cycle of one month. Our front-end team in
San Francisco released every week. The API team release cycle was so long
because a lot of (almost all) the functionality had to be tested manually.
That’s understandable. It was a monolith without proper automated test coverage
after all—when they modified one part, they never knew what can go wrong in
other parts of the application.
Continue reading “Why GraphQL is Taking Over APIs”
Author AzatPosted on January 9, 2019January 9, 2019Categories JavaScript,
Node.js1 Comment on Why GraphQL is Taking Over APIs
PRACTICAL NODE.JS, 2ND EDITION: COLORED PRINT BOOK IS READY
The Practical Node.js, 2nd Edition print book is finally ready. It turned out
the biggest thickest book I ever wrote (500+ pages). Practical Node, 2nd Ed. is
even thicker than React Quickly.
The Practical Node.js, 2nd Edition print book is finally ready. It turned out
the biggest thickest book I ever wrote (500+ pages). Practical Node, 2nd Ed. is
even thicker than React Quickly.
Continue reading “Practical Node.js, 2nd Edition: Colored Print Book is Ready”
Author AzatPosted on December 23, 2018October 19, 2022Categories Book,
Node.jsLeave a comment on Practical Node.js, 2nd Edition: Colored Print Book is
Ready
TRIAGE VS. PLANNING
A discussion came up in at my work about distinction between a triage and
planning meetings. My take on this is that triage reactive whereas planning is
active.
Let me illustrate this with examples. Imagine a customer-facing app like a
WordPress CMS. Users use the CMS, encounter bugs, and curse. They sometimes
report the bugs. An engineering team or a product manager will triage the
incoming bugs and issues to sort out what need an urgent fix and what can be
deferred. Bugs tend to be urgent but not always important (at least not
important for the majority of users).
On the other hand, there is an important task. The CMS has a roadmap to add a
paid feature that should increase company revenue and make the next year
profitable. The paid feature needs to be implemented. It’s the top priority. Its
implementation must be planned actively, separately and before any bugs. If not
planned, bugs can take up all the time.
Thus, my suggestion is to plan and plan the priority first. Then plan the
triaged work on bugs and tech debt. Focus on important first, not urgent.
Author AzatPosted on August 18, 2018Categories Advices, Leadership, Lean
Startup, WorkLeave a comment on Triage vs. Planning
BREAKING INTO IT AND TECH AS A BEGINNER
I got an email from a person frustrated that he can’t get an entry-level job in
IT/tech. He knows PHP, HTML, CSS and MySQL, but he is tired of all the companies
rejecting him and requiring a “perfect” expert (as he put it). That’s true that
there are not that many entry-level jobs in tech. It’s hard break into tech.
Most companies only interview senior engineers with at least five (5) years of
industry experience.
Continue reading “Breaking Into IT and Tech as a Beginner”
Author AzatPosted on July 27, 2018October 19, 2022Categories Advices, Work1
Comment on Breaking Into IT and Tech as a Beginner
TRICKY ENGLISH GRAMMAR FOR PROGRAMMERS
As I was editing my new book Practical Node.js, 2nd Edition, I found a few
recurring mistakes that my publisher’s editor was correcting. I wrote over dozen
of books but I still don’t know some of English grammar. Do you know some of
these tricky rules?
* Front-end app vs. frontend
* Which vs. that
* While vs. whereas
* May vs. might
* Login vs log in
Front-end is an adjective while frontend is a noun. For example, “I build
front-end systems”, but “I work on the frontend”.
Which needs comma and it is less important than that, which is used without a
comma. The which clause can be removed but the that one cannot be removed
without the loss of the meaning. For example, “I like Node.js, which is
JavaScript on the server”, but “Create a file that starts the Koa server”.
While and whereas are similar when you contrast two things, but whereas is a bit
more formal (and less used in spoken language). While can be used for timing but
whereas cannot. For example, “window is a global variable in browsers
while/whereas global is in Node”, but “When it’s noisy in cafes, I write code
while listening to Spotify”.
May has more probability than might. For example, “I may go to Japan next
quarter”, but “I might quit Node.js and move to Denmark to study Artificial
Intelligence”.
Finally, login is a noun and log in is a verb. For example, “Implement login
using OAuth 2.0”, but “You need to log in to AWS console as admin first and only
then create a new user”.
Author AzatPosted on July 8, 2018Categories AdvicesLeave a comment on Tricky
English Grammar for Programmers
5 HABITS OF HIGHLY SUCCESSFUL SOFTWARE ENGINEERS
There are multiple ways how software engineers can achieve a successful career.
Some can be early employees at Google while others can be a life-long employees
of IBM. Some can build side projects while other can get equity. But there are
only five common habits and traits:
1. LEARN: Find balance between learning and doing. Have a solid knowledge of
fundamentals either from college degrees or from educating yourself with
books and online courses. Constantly apply your knowledge to practice.
2. WORK: Find balance between productivity and rest. Consistency in
productivity is better than burnout.
3. CONTRIBUTE: Learn the business side of things. Produce highly valuable
products which are useful for customers and beneficial for the business.
4. INNOVATE: Invest in a forward-thinking technology that a reasonable person
would expect to become more in demand and desirable over tie.
5. THINK LONG-TERM: Treat others with respect, honestly and fairly. Think and
act long-term. Contribute to open source or teach because it helps you and
others.
Author AzatPosted on May 28, 2018Categories Advices1 Comment on 5 Habits of
Highly Successful Software Engineers
PROGRAMMER VS. SOFTWARE ENGINEER VS. SOFTWARE DEVELOPER VS. CODER
Hello everyone! In this post, I want to contrast the terms with which other
people and we ourselves call us. There are a lot of confusion around the names
for our trade. People use terms such as software engineer, software developer.
Some people even use programmer or coder, etc., etc. And some event go as far as
ninja, guru, or rock star. So let’s take a look at the differences. Of course,
it’s all just my opinion but I’ve been in this industry for 15 years. I know a
bit or two. So let’s go ahead.
Continue reading “Programmer vs. Software Engineer vs. Software Developer vs.
Coder”
Author AzatPosted on May 24, 2018Categories AdvicesLeave a comment on Programmer
vs. Software Engineer vs. Software Developer vs. Coder
5 REASONS PROGRAMMING IS AWESOME
Let’s start from the smallest to the biggest five reasons why programming and
software development is awesome.
The reason number 5 (smallest) is programming can pay really well. The average
income in the USA is somewhere along $50K per year per household. Programmers
typically starts their careers with $80K/year salaries. In major metro areas the
salaries are way higher than that. They can easily be in the $120–150K/year
range.
The reason number 4 is that you are never bored. There’s always something new.
Sometimes new technologies come out before you even release your product. Thus,
you are never out of things to learn and update. A lot of people are bored out
of their minds at their jobs. Most of them perform the same mundane tasks for 5,
10, 15 years… Not you. Lucky you! Programmers can always grow, learn and master
the skills by learning and seeking more challenging problems and solving them.
The reason number 3 is that it’s a real career. Some jobs are not careers. Avoid
them. For example, a taxi or an Uber/Lyft driver will always be a driver. A
Denny’s waitress will always be a waitress even after 40 years at her job. It’s
a dead end. Avoid it. A lot of programmers start as junior developers/engineers,
then they progress to associate developers. This could happen in as short as two
(2) years. After that, some of them are promoted to senior developers in as
short as 3–4 years. That’s not all. The path continues to principal, staff
engineer, architect, manager, director, vice president of engineering and to
CTO. A lot of tech companies have engineers as their senior leaders, e.g.,
Microsoft, Google, etc.
Continue reading “5 Reasons Programming is Awesome”
Author AzatPosted on May 19, 2018May 19, 2018Categories Advices1 Comment on 5
Reasons Programming is Awesome
MY NEW BOOK CONCEPT AND TOP QUALITIES OF A GOOD SOFTWARE ENGINEERS
Packt Publishing reached out to me and offered to do a book.
They pretty much want me to do any book and pre-agreed already. They gave me
carte blanche on the topic.
(More or less, I doubt I can convince them to publish a vampire thriller set in
a Silicon Valley startup.)
Funny thing is that I know the editor. He worked at Apress Media when I
published my first book Practical Node.js with them.
I submitted to them my idea about a software engineering career book for junior
developers. They liked it. It can become a book!
While thinking about the career in software engineering, I thought about top
skills.
As in any profession, software engineers requires a combination of certain
skills and techniques.
I’ve done software engineering for over 15 years.
I taught total beginners (in Hack Reactor) and professionals (in Fortune 500
companies).
The most important skill in a good software engineer is not smarts. No. It’s not
how good he can write code.
It’s not soft skills either
Continue reading “My New Book Concept and Top Qualities of a Good Software
Engineers”
Author AzatPosted on May 3, 2018May 4, 2018Categories Advices, PersonalLeave a
comment on My New Book Concept and Top Qualities of a Good Software Engineers
HARDWORKING VS GENIUS PROGRAMMERS
Does someone have to be a genius to be a programmer? It definitely helps but
only if the person is NOT afraid of hard work. You see, a lot of smart people
are compelled by challenging and tough problems. They want to solve complex
issues.
Continue reading “Hardworking vs Genius Programmers”
Author AzatPosted on April 30, 2018Categories AdvicesLeave a comment on
Hardworking vs Genius Programmers
BORN VS MADE PROGRAMMERS
Are programmers born or made? It depends. In 2010s, programming is so much
easier than it used to be in 2000s. More and more gurus and dev bootcamp
founders proclaim that programmers can be made.
I won’t say programmers are made. My answer: it depends. Instead of thinking
programmers are made, utilize whatever belief is more useful to you.
If you are starting on the programming path later in your life as a second (or
third, or fourth) career choice, then thinking programmers are born is
detrimental! Why would you do such a thing?
Think and truly believe that programmers are made, if you want to succeed as a
programmer. That’s because every time you encounter an issue, you’ll be inclined
to work through it when you think that NOW you are a programmer.
On the contrary, you will be more successful thinking programmers are born, if
you has been programming from your teens and programming is the only career you
ever had. The reason is when you encounter a problem, you’ll be forced to find a
solution because that’s what you do. You are a programmer and alway was. You
have to come up with the answer because you are a programmer. You’ll value your
job and think it’s your missing to write great software, because you won a lucky
lottery.
If we dig deeper, programmer are not born. No one in the hospital looks at a
child and says “congratulations, that’s a programmer”, “you are luckliy, that’s
a QA engineer”, “sorry, that’s a designer”. No. Most likely it’s a dumb luck.
The kid got a computer as an early age and tried programming and liked it. Then
he got more experience and made himself into a programmer. So born is actually
made just at an earlier age.
In any case, think and believe whatever is more useful to you in your career and
life. Not what someone else tells you.
Author AzatPosted on April 24, 2018April 24, 2018Categories AdvicesLeave a
comment on Born vs Made Programmers
IT CONSOLIDATION
IT CONSOLIDATION
I’ve been working on the new edition of my best selling book Full Stack
JavaScript. I was updating references, links and names of the services. A lot of
libraries are dead and the links are unreachable. A lot of services are dead or
being bought by big companies. The list is huge. Compose which was MongoHQ is
now part of IBM. StrongLoop is part of IBM. Heroku is part of Salesforce.
Parse.com was bought and discontinued. Firebase is part of Google. Joyent is
part of Samsung.
It’s kind of depressing. Take a look at this page. Nodejitsu, which was one of
the first Node PaaS solutions, says it joins GoDaddy which is just an hiring of
the team. They refer to Modulus which you think is another PaaS, but it’s not.
It’s a very poorly-done website for what looks like some consulting company in
the trading space or like some scam a 14-year old kid put together to get money
for video games. The link to the blog post announcing Nodejitsu closure is 404
Not Found.
The previous edition of Full Stack JavaScript was published in 2015. In three
years, a lot of companies either sold for scraps or closed or both (sold then
closed the projects). It’s very refreshing to see this trend in a long span of
several years.
Every market goes through cycles. First there’s an expansion with various
offerings and then there’s a retraction with just a few major players
dominating. It’s a winner takes all economy. Amazon, Google, Microsoft and IBM
are serving major cloud services now. Startups are hard and most of them don’t
know how execute. VCs are pushing for startups to spend more to acquire
marketshare. The big companies have more leverage and more room for mistakes.
They can just buy the best startup in the end.
Is it still worth trying to start your tech startup in 2018? Probably not unless
it’s something completely new. You can’t drive forward while looking in a rear
view mirror.
Author AzatPosted on April 1, 2018Categories StartupsLeave a comment on IT
Consolidation
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RECENT POSTS
* Adding constraint on a foreign key with node-pg-migration April 17, 2023
* How to show all constraints on a Postgres table April 17, 2023
* Leveraging Messengers for MVP Validation and Sales in Your Tech/IT Startup
April 1, 2023
* What’s new in React 17: new features and improvements March 9, 2023
* MMAT: My Teaching and Learning Approach January 31, 2020
* Why I’m Getting a Second Master’s Degree from HEC Paris August 11, 2019
* Acquisition of Node University by DevelopIntelligence June 3, 2019
* Azat’s Management Philosophy March 6, 2019
* Why GraphQL is Taking Over APIs January 9, 2019
* Practical Node.js, 2nd Edition: Colored Print Book is Ready December 23, 2018
MY OTHER BOOKS
Practical Node.js: Building Real-World Scalable Web Apps (Apress)
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Rapid Prototyping with JS: Agile JavaScript Development.
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Twitter API OAuth 1.0, OAuth 2.0, OAuth Echo, Everyauth and OAuth 2.0 Server
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ProgWriter [programmer + writer]: Lessons learned on my path from ordinary
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JavaScript and Node FUNdamentals: A Collection of Essential Basics
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Pro Express.js: Master Express.js—The Node.js Framework For Your Web Development
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