PragProg Customers

Agile Web Development with Rails 7: 'rails new demo' specifying the Rails version has no affect

shusseina

shusseina

Agile Web Development with Rails 7: 'rails new demo' specifying the Rails version has no affect

@rubys

Created the demo app with the following command from page 102:

work>​​ ​​rails​​ ​​new​​ ​​demo​

Examined the installation with the following command from page 104:

​demo>​​ ​​bin/rails​​ ​​about​

Output indicated Rails 7.0.5:

About your application's environment Rails version 7.0.5

So I deleted the demo directory and ran the command, specifying the version:

rails _7.0.4_ new demo

Command bin/rails about still reports Rails 7.0.5. However, the Gemfile indicates 7.0.4:

gem "rails", "~> 7.0.4"

I presume 7.0.4 vs 7.0.5 is not going to make much of a difference. However, it would be nice to understand what’s going here.

FYI, gem list rails --local output:

*** LOCAL GEMS *** importmap-rails (1.1.6) rails (7.0.5, 7.0.4) rails-dom-testing (2.0.3) rails-html-sanitizer (1.6.0) sprockets-rails (3.4.2) stimulus-rails (1.2.1) turbo-rails (1.4.0)
3 comments
#question/book-agile-web-development-with-rails-7
2 573 3

Marked As Solved

edward-mb

edward-mb

This is how RubyGems Semantic Versioning with Pessimistic version constraint works

gem "rails", "~> 7.0.4" # means >= 7.0.4 and < 7.1

Semantic versioning boils down to:

  • PATCH 0.0.x level changes for implementation level detail changes, such as small bug fixes
  • MINOR 0.x.0 level changes for any backwards compatible API changes, such as new functionality/features
  • MAJOR x.0.0 level changes for backwards incompatible API changes, such as changes that will break existing users code if they update

If you use a version specifier like "~> 7.0.4" bundler will always pick the latest patch of the given version 7.0 of the gem.

Most of the version specifiers, like >= 1.0 , are self-explanatory. The specifier ~> has a special meaning, best shown by example. ~> 2.0.3 is identical to >= 2.0.3 and < 2.1 . ~> 2.1 is identical to >= 2.1 and < 3.0 . ~> 2.2.beta will match prerelease versions like 2.2.beta.12 . ~> 0 is identical to >= 0.0 and < 1.0 .

1
Post #3

Also Liked

rubys

rubys

Author of Agile Web Development With Rails

I’ve added an explanation and suggested replacing the twiddle-wakka with an equals sign.

1
Post #4

Where Next?

View thread on forum
View Agile Web Development With Rails 7's book portal
Post errata for this book
Post a suggestion for this book
Post a question about this book
Post a review about this book
question
Home PragProg Customers
#question/book-agile-web-development-with-rails-7
2 573 3
Last post

Popular Pragmatic Bookshelf topics Top

jimschubert
PragProg Customers

Distributed Services With Go - Ch 3 index errors on Config
In Chapter 3, the source for index introduces Config on page 31, followed by more code including tests; Config isn’t introduced until pag...
#pragprog#errata/book-distributed-services-with-go
8 1311 3
New
jeffmcompsci
PragProg Customers

Design and Build Great Web APIs: typo (page, 19, third bullet in URL list)
Title: Design and Build Great Web APIs - typo “https://company-atk.herokuapp.com/2258ie4t68jv” (page 19, third bullet in URL list) Typo:...
#pragprog#errata/book-design-and-build-great-web-apis
8 1931 7
New
jesse050717
PragProg Customers

Web Development with Clojure, Third Edition: Issue adding Shadow CLJS
Title: Web Development with Clojure, Third Edition, pg 116 Hi - I just started chapter 5 and I am stuck on page 116 while trying to star...
#question/book-web-development-with-clojure-third-edition
4 1194 4
New
simonpeter
PragProg Customers

Web Development with Clojure, Third Edition: (create-migration "guestbook") not working (page 9)
When I try the command to create a pair of migration files I get an error. user=&gt; (create-migration "guestbook") Execution error (Ill...
#errata/book-web-development-with-clojure-third-edition
5 1782 4
New
conradwt
PragProg Customers

Programming Phoenix 1.4: Chapter 11 - Extracting Rumbl and RumbleWeb (Page 237, 238, 240)
First, the code resources: Page 237: rumbl_umbrella/apps/rumbl/mix.exs Note: That this file is missing. Page 238: rumbl_umbrella/app...
#errata/book-programming-phoenix-1-4
1 1106 2
New
oaklandgit
PragProg Customers

Hands-on Rust: Failed to Load Texture error (page 121)
Hi, I completed chapter 6 but am getting the following error when running: thread 'main' panicked at 'Failed to load texture: IoError(O...
/book-hands-on-rust
2 1305 3
New
s2k
PragProg Customers

Agile Web Development with Rails 7: Reloading assets in development mode
Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...
#question/book-agile-web-development-with-rails-7
2 1379 4
New
rainforest
PragProg Customers

Real-Time Phoenix: use PubSub with implementation of Phoenix.Socket.Transport rather than channels (page 37)
Hi, I’ve got a question about the implementation of PubSub when using a Phoenix.Socket.Transport behaviour rather than channels. Before ...
#question/book-real-time-phoenix#websockets#phoenixsocket#pubsub
0 1519 3
New
tkhobbes
PragProg Customers

Modern Front-End Development for Rails - application does not start after run bin/setup (page xviii)
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
#errata/book-modern-front-end-development-for-rails
0 1461 5
New
dachristenson
PragProg Customers

Kotlin and Android Development featuring Jetpack: No activity_main.xml anymore
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
#errata/book-kotlin-and-android-development-featuring-jetpack
0 2120 6
New

Other popular topics Top

AstonJ
General Dev>Dev Chat

Best chairs for developers?
What chair do you have while working… and why? Is there a ‘best’ type of chair or working position for developers?
#workspace#opinions
74 5181 41
New
brentjanderson
General Dev>Hardware

Moonlander Keyboard (Mechanical) (Ergonomic) (Split) (Ortholinear)
Bought the Moonlander mechanical keyboard. Cherry Brown MX switches. Arms and wrists have been hurting enough that it’s time I did someth...
#hardware/keyboards#moonlander#mechanical-keyboards#ortholinear#ergonomic
212 16447 90
New
First poster: bot
Backend>In The News

Bit – A modernized Git CLI written in Go
github.com
/go#git
1 5741 0
New
AstonJ
General Dev>Hardware

Keyboard thock (sound)
I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...
/keyboards#mechanical-keyboards
14 9747 8
New
AstonJ
Backend>Chat

How to install Ruby 3 with ASDF
In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...
/ruby#asdf
11 5679 4
New
gagan7995
Backend>Questions

Please tell me how to write a query for this in nodejs
API 4 Path: /user/following/ Method: GET Description: Returns the list of all names of people whom the user follows Response [ { ...
/nodejs
7 3258 3
New
AstonJ
macOS>Chat

How to block any website on Mac using Little Snitch
If you want a quick and easy way to block any website on your Mac using Little Snitch simply… File &gt; New Rule: And select Deny, O...
#macos#how-to#littlesnitch
5 9782 3
New
PragmaticBookshelf
Community>In The Spotlight

Spotlight: VM Brasseur (Author) Interview and AMA!
Author Spotlight: VM Brasseur @vmbrasseur We have a treat for you today! We turn the spotlight onto Open Source as we sit down with V...
#author-spotlight/book-forge-your-future-with-open-source
16 4431 11
New
PragmaticBookshelf
Community>In The Spotlight

Spotlight: Bruce Tate (Author) Interview and AMA!
Author Spotlight: Bruce Tate @redrapids Programming languages always emerge out of need, and if that’s not always true, they’re defin...
/elixir/ruby/phoenix/book-seven-more-languages-in-seven-weeks/book-seven-languages-in-seven-weeks#liveview/book-programming-phoenix-liveview
54 4972 23
New
AstonJ
AI>Chat

How to: Run DeepSeek on Mac, Windows, and Linux!
This is a very quick guide, you just need to: Download LM Studio: https://lmstudio.ai/ Click on search Type DeepSeek, then select the o...
#macs/deepseek#guides#lm-studio
14 7706 10
New
Back to top

Latest in Agile Web Development with Rails 7

Agile Web Development with Rails 7 Portal ❯

PragProg Customers

Pragmatic Bookshelf PragProg Customers ❯

Latest on Devtalk

Devtalk ❯

We ❤️ helpful members!

We reward our most helpful members via our MOTM scheme - by giving away a whopping 25 books per year!

Member of the Month

Devtalk Sponsors

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Erlang Solutions

We build trusted fault-tolerant systems that scale to billions of users.

Honeybadger

Real-time error tracking, performance insights, and observability for devs.

Manning Publications

Develop your skills with books, videos, and courses.

AppSignal

Catch errors, track performance, monitor hosts and more.

WyeWorks

Enabling companies to succeed by building software people love.

Pragmatic Studio

Courses that move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

Categories:

Sub Categories:

Popular Portals

Devtalk Sponsors

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Erlang Solutions

We build trusted fault-tolerant systems that scale to billions of users.

Honeybadger

Real-time error tracking, performance insights, and observability for devs.

Manning Publications

Develop your skills with books, videos, and courses.

AppSignal

Catch errors, track performance, monitor hosts and more.

WyeWorks

Enabling companies to succeed by building software people love.

Pragmatic Studio

Courses that move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

We're in Beta

About us Mission Statement See our Roadmap