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Last active December 17, 2015 17:59
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Rails tips
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rails_tips.md

Rails tips

Session count

f = ActiveRecord::Base.connection.execute("SELECT COUNT(id) FROM db_sessions")
f.each { |ff| p ff }

Recreate schema_migrations table

Dir.open('db/migrate').each do |fname|
  i = fname.split('_').first.to_i
  next if i == 0
  ActiveRecord::Base.connection.execute("INSERT INTO schema_migrations (version) VALUES(#{i})")
end

Small tips related to migrate

I always forget the db:migrate API.

rake db:migrate:redo VERSION=my_version
db:migrate:up VERSION=my_version
db:migrate:down VERSION=my_version

Credits

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