Continuing in Rails Console

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Continuing in Rails Console

Ralph Shnelvar
Continuing in Rails Console Rubyonrails-talk,

My environment is:
Ubuntu 16.04
Rails 5.2.0
Ruby 2.3.1p112


From an Ubuntu command prompt I write
 rails c

and I get

Loading development environment (Rails 5.2.0)
irb(main):001:0> c
NameError: undefined local variable or method `c' for main:Object
Did you mean?  cb
       from (irb):1
irb(main):002:0> continue
NameError: undefined local variable or method `continue' for main:Object
Did you mean?  context
       from (irb):2
irb(main):003:0> 2+3
=> 5
irb(main):004:0>



How does one continue execution?

What commands are available from the irb command prompt?

Note: The app works from webrick and I can debug using byebug



My Gemfile follows
- - - - - -- - -

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.3.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.0'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
 # Call 'byebug' anywhere in the code to stop execution and get a debugger console
 gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
 # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
 gem 'web-console', '>= 3.3.0'
 gem 'listen', '>= 3.0.5', '< 3.2'
 # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
 gem 'spring'
 gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
 # Adds support for Capybara system testing and selenium driver
 gem 'capybara', '>= 2.15', '< 4.0'
 gem 'selenium-webdriver'
 # Easy installation and use of chromedriver to run system tests with Chrome
 gem 'chromedriver-helper'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]




Ralph Shnelvar

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Re: Continuing in Rails Console

Hassan Schroeder-2
On Mon, Jul 9, 2018 at 6:54 AM, Ralph Shnelvar <[hidden email]> wrote:

> From an Ubuntu command prompt I write
>  rails c
>
> and I get
>
> Loading development environment (Rails 5.2.0)
> irb(main):001:0>

> irb(main):003:0> 2+3
> => 5

> How does one continue execution?

?? "irb" stands for Interactive RuBy -- like any REPL it's waiting
for YOU to enter something for it to do, like add 2 + 3 above.

> What commands are available from the irb command prompt?

Ruby/Rails methods.

Do you have an ActiveRecord class 'Thing'? Then you can do
e.g. `Thing.where(color: 'red')` and so on.

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Re: Continuing in Rails Console

Ralph Shnelvar
Re: [Rails] Continuing in Rails Console Hassan,

I thank you for your answer.

I entered both "c" and "continue" at the irb prompt ... and got the two NameError's.  This time I'll make my inputs red.


Loading development environment (Rails 5.2.0)
irb(main):001:0> c
NameError: undefined local variable or method `c' for main:Object
Did you mean?  cb
      from (irb):1
irb(main):002:0> continue
NameError: undefined local variable or method `continue' for main:Object
Did you mean?  context
      from (irb):2
irb(main):003:0> 2+3
=> 5
irb(main):004:0>



I am still at a loss how to continue execution at the irb prompt.

Ralph



Monday, July 9, 2018, 9:04:15 AM, you wrote:

HS> On Mon, Jul 9, 2018 at 6:54 AM, Ralph Shnelvar <
[hidden email]> wrote:

>> From an Ubuntu command prompt I write
>>  rails c

>> and I get

>> Loading development environment (Rails 5.2.0)
>> irb(main):001:0>

>> irb(main):003:0> 2+3
>> => 5

>> How does one continue execution?

HS> ?? "irb" stands for Interactive RuBy -- like any REPL it's waiting
HS> for YOU to enter something for it to do, like add 2 + 3 above.

>> What commands are available from the irb command prompt?

HS> Ruby/Rails methods.

HS> Do you have an ActiveRecord class 'Thing'? Then you can do
HS> e.g. `Thing.where(color: 'red')` and so on.

HS> --
HS> Hassan Schroeder ------------------------
[hidden email]
HS> twitter: @hassan
HS> Consulting Availability : Silicon Valley or remote




Ralph

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Re: Continuing in Rails Console

Colin Law
On 9 July 2018 at 16:46, Ralph Shnelvar <[hidden email]> wrote:
...
I am still at a loss how to continue execution at the irb prompt.

If you tell us what you mean by continue execution then someone may be able to help.  What do you expect to happen when you tell it to continue execution? And don't just say you expect it to continue.  No-one knows what you mean.

Colin
 

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Re: Continuing in Rails Console

Hassan Schroeder-2
In reply to this post by Ralph Shnelvar
On Mon, Jul 9, 2018 at 8:46 AM, Ralph Shnelvar <[hidden email]> wrote:

> I am still at a loss how to continue execution at the irb prompt.

REPL stands for "read–eval–print loop" -- irb is waiting to *read*
some input to *eval* and *print*.

Using the word "continue" here is meaningless.

Maybe describe what you're hoping to achieve using the console?

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Re: Continuing in Rails Console

Ralph Shnelvar
In reply to this post by Colin Law
Re: [Rails] Continuing in Rails Console Colin and Hassan,

When I start rails with webrick and have a byebug statement in a controller or view, things drop into the byebug debugger. A "c" will continue execution.  I expect/expected the rails console to drop  into irb so it stops execution before Rails loads so that one can attempt to debug initialization.

Ralph



Monday, July 9, 2018, 10:02:19 AM, you wrote:


On 9 July 2018 at 16:46, Ralph Shnelvar <[hidden email]> wrote:
...
I am still at a loss how to continue execution at the irb prompt.

If you tell us what you mean by continue execution then someone may be able to help.  What do you expect to happen when you tell it to continue execution? And don't just say you expect it to continue.  No-one knows what you mean.

Colin

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Ralph

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Re: Continuing in Rails Console

Brandon McClelland
From your original message it sounds like you were starting your own instance of the console using 'rails c' from the terminal; it doesn't sound to me that this is how you interact with byebug. According to http://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-byebug-gem you should be put into a console by byebug itself.

On Mon, Jul 9, 2018 at 11:51 AM Ralph Shnelvar <[hidden email]> wrote:
Colin and Hassan,

When I start rails with webrick and have a byebug statement in a controller or view, things drop into the byebug debugger. A "c" will continue execution.  I expect/expected the rails console to drop  into irb so it stops execution before Rails loads so that one can attempt to debug initialization.

Ralph



Monday, July 9, 2018, 10:02:19 AM, you wrote:


On 9 July 2018 at 16:46, Ralph Shnelvar <[hidden email]> wrote:
...
I am still at a loss how to continue execution at the irb prompt.

If you tell us what you mean by continue execution then someone may be able to help.  What do you expect to happen when you tell it to continue execution? And don't just say you expect it to continue.  No-one knows what you mean.

Colin

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Ralph

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Re: Continuing in Rails Console

Hassan Schroeder-2
In reply to this post by Ralph Shnelvar
On Mon, Jul 9, 2018 at 9:51 AM, Ralph Shnelvar <[hidden email]> wrote:

> I expect/expected the rails console to drop  into irb so it stops execution
> before Rails loads so that one can attempt to debug initialization.

When you start `rails console` and get the IRB prompt, Rails is
basically loaded at that point, so no.

And if Rails is broken, you probably won't get to the prompt anyway :-)

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