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# Multiple Inheritance in Ruby | Ruby on Rails Examples
In this post we will learn about multiple inheritance in ruby.
[http://localhost:4000/ruby-modules-mixins-inheritance-copy/](http://localhost:…
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```
Hello,
I have this erreor when I click on DMSF link from a project :
ActionView::TemplateError (undefined method `size' for nil:NilClass) on
line #64 of vendor/plugins/redmine_dmsf/app/views/…
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**Is your feature request related to a problem? Please describe.**
I would like to know whenever logging fails. It seems that there is a way to do it when using it without the rails setup but it's un…
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### Steps to reproduce
In ActiveRecord 7.1, a new option was added to [ActiveRecord::Batches#in_batches](https://api.rubyonrails.org/classes/ActiveRecord/Batches.html#method-i-in_batches), `use_ran…
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```
Steps to reproduce:
1. when trying to add a new vps after loading new vps windows and filling out
vps details when clicking on create
Actual result:
creation failed
Expected result:
creation of…
-
```
Steps to reproduce:
1. when trying to add a new vps after loading new vps windows and filling out
vps details when clicking on create
Actual result:
creation failed
Expected result:
creation of…
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in Gemfile we have
```ruby
group :development do
gem 'thin', require: false
end
```
When I start rails server I get eventmachine errors
```
rails s -b lvh.me -p 3000
=> Booting Thin
=>…
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Now, I keep getting this error.
I tried googling and it told me to rm file server.pid when my server wasnt working and I did and now I get this.
rails s
=> Booting WEBrick
=> Rails 4.0.4 applicati…
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codemonkey
bitch better have my code
rails
railscats
railswaffles
railsmonkeys
conductrice
railbies
ruby
ruby klimbim
ruby riders
fork
forklove
still forking
merge
merge conflicters
merge simpson
…
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Hey Peek team,
I tried to install Peek into my org's Rails 3.0 app, and while installing the gem went fine, Rails got hung up on an error when trying to start the server up.
Some stack trace:
```
/…