Learning CouchDB for a SQL educated person is sometimes a bit tricky because things are solved so different. So happened to me. Currently I am trying to create a simple invoicing app based on CouchDB. When creating invoices you might want to have a straight integer sequence to acts as invoice numbers. In a RDBM [...]
In order to debug couchDB view functions you can use the log – function: You’ll find the output in your couchdb-Log file.
When starting to work with CouchDB the lack of an indepth documentation can be a bit frustrating. If you’re wondering where JavaScript methods like “sum” used in reduce functions are described, for example, you don’t find any detailed information in the CouchDB-Wiki. What you can do is to have a look at: COUCHDB_HOME/share/server There are [...]
When trying to create a rails project you might encounter the following error: /Users/jfischer/.rvm/gems/ruby-1.9.1-p378/gems/rails-3.0.0.beta3/bin/rails:1:in `require’: no such file to load — rails/cli (LoadError) from /Users/jfischer/.rvm/gems/ruby-1.9.1-p378/gems/rails-3.0.0.beta3/bin/rails:1:in `<top (required)>’ from /Users/jfischer/.rvm/gems/ruby-1.9.1-p378/bin/rails:19:in `load’ from /Users/jfischer/.rvm/gems/ruby-1.9.1-p378/bin/rails:19:in `<main>’ The problem can be solved by uninstalling all prior rails and active* beta versions using the gem command: gem uninstall railties actionpack [...]
If you encounter an error like the following when trying to install rails 3 prerelease: ravel:~ jfischer$ gem install rails –prerelease Successfully installed rails-3.0.0.beta3 1 gem installed Installing ri documentation for rails-3.0.0.beta3… ERROR: While executing gem … (Errno::ENOENT) No such file or directory – lib then you might want to try skipping the ri and [...]
Really impressed by the beauty of scottish architecture I was wondering how the Scottish Ruby Conference will be like.It has been held at the Royal College of Physicians in Edinburgh a really impressive location. With a history of more than 300 (!) years it is an organization contrasting the the baby aged computer science fraction. The contrast of talks [...]
If you ever have to print a document from a Ruby app you might want to consider using JRuby to access the Java Printing API.Here is a small example accessing the API, looking up the printers and printing out their names to the console: The output looks like this: Anzahl der Drucker: 1HP Photosmart 8000 series