Class: RelaxDB::GraphCreator

Inherits:
Object
  • Object
show all
Defined in:
lib/more/grapher.rb

Overview

The GraphCreator uses dot to create a graphical model of an entire CouchDB database It probably only makes sense to run it on a database of a limited size The created graphs can be very useful for exploring relationships Run ruby scratch/grapher_demo.rb for an example

Class Method Summary collapse

Class Method Details

.create ⇒ Object 



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# File 'lib/more/grapher.rb', line 11

def self.create
  system "mkdir -p graphs"
  
  data = JSON.parse(RelaxDB.db.get("_all_docs").body)
  all_ids = data["rows"].map { |r| r["id"] }
  all_ids = all_ids.reject { |id| id =~ /_/ }
  
  dot = "digraph G { \nrankdir=LR;\nnode [shape=record];\n"
  all_ids.each do |id|
    doc = RelaxDB.load(id)
    atts = "#{doc.class}\\l|"
    doc.properties.each do |prop|
      # we don't care about the revision
      next if prop == :_rev 
      
      prop_val = doc.instance_variable_get("@#{prop}".to_sym)
      atts << "#{prop}\\l#{prop_val}|" if prop_val
    end
    atts = atts[0, atts.length-1]
    
    dot << %Q%#{doc._id} [ label ="#{atts}"];\n%
    
    doc.class.references_rels.each do |relationship, opts|
      id = doc.instance_variable_get("@#{relationship}_id".to_sym)
      dot << %Q%#{id} -> #{doc._id} [ label = "#{relationship}"];\n% if id
    end
              
  end
  dot << "}"
  
  File.open("graphs/data.dot", "w") { |f| f.write(dot) }
  
  system "dot -Tpng -o graphs/all_docs.png graphs/data.dot"
end