ruby-on-rails Archives - Page 19 of 19

How to get a random number in Ruby

How do I generate a random number between 0 and n? 17 s 17 Use rand(range) From Ruby Random Numbers: If you needed ...

April 21, 2022
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Can’t find the ‘libpq-fe.h header when trying to install pg gem

I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. ...

April 17, 2022
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How to rollback a specific migration?

I have the following migration file db\migrate\20100905201547_create_blocks.rb How can I specifically rollback that migration file? 15 s 15 rake db:rollback STEP=1 Is a ...

April 17, 2022
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Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with rails

I’m getting the error: FATAL: Peer authentication failed for user "postgres" when I try to make postgres work with Rails. Here’s my pg_hba.conf, ...

April 15, 2022
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Understanding the Rails Authenticity Token

I am running into some issues regarding the Authenticity Token in Rails. I would really like to understand the Authenticity token. Do you ...

April 15, 2022
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How do I get the current absolute URL in Ruby on Rails?

How can I get the current absolute URL in my Ruby on Rails view? The request.request_uri only returns the relative URL. 33 s ...

April 15, 2022
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Why do people use Heroku when AWS is present? What distinguishes Heroku from AWS? [closed]

Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be ...

April 14, 2022
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How to understand nil vs. empty vs. blank in Ruby

I find myself repeatedly looking for a clear definition of the differences of nil?, blank?, and empty? in Ruby on Rails. Here’s the ...

April 14, 2022
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How can I rename a database column in a Ruby on Rails migration?

I wrongly named a column hased_password instead of hashed_password. How do I update the database schema, using migration to rename this column? 3 ...

April 12, 2022
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