search for: relation_typ

Hi all, I am a newbie in ruby/rails. I have a question about my database model: table1: entities (name, description, author_id ...) table2: relations (source_id, target_id, relation_type) (it describes the relations between 2 entities and the relation type) How can I define models using rails, or do I need to redefine my database schema? thank you -- Posted via http://www.ruby-forum.com/.

Hi all, I was wondering whether anyone could guide me to docu and code examples how to create and use a has_and_belongs_to_many relationship with a joining table where TWO columns are used to identify the relation to TWO alternative tables. Example: table 1: mothers [mother_id, name] table 2: fathers [father_id, name] table 3: children [child_id, name] joining table 4: children_parent

Hello, I encouter a problem when i try to do "rake db:migrate": rake aborted! can''t convert Hash into String Here is the trace result: ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment rake aborted! can''t convert Hash into String /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:1408:in