Generates FactoryGirl factories.rb from the database tables/columns

factories.rake

namespace :factories do
  
  task :generate => :environment do
    
    # Make a new factory file, moving the old one to factories_old.rb if one exists.
    factory_file = "#{Rails.root}/spec/factories"
    FileUtils.mv("#{factory_file}.rb", "#{factory_file}_old.rb") if File.exists?("#{factory_file}.rb")
    
    fixture_file = File.open("#{factory_file}.rb", 'w') do |file|
    
      # Capture all db tables, creating factories out of them.
      model_names  = ActiveRecord::Base.connection.tables.reject{ |table| table.match(/(schema|delayed)/i) }.collect{ |table| table }
      model_names.each do |model|
        
        # Find all of the columns in this table.
        klass   = model.classify.constantize
        columns = klass.columns.reject{ |col| col.name.match(/(id|created_at|updated_at|type)/i) }
        
        # Stub the factory with all of the columns, and add some fake values.
        # Then write data to the file
        #
        file.write("Factory.define(:#{model.singularize}) do |#{model[0].downcase}|\n")        
        mock_values(model, columns).each{ |val| file.write("#{val}\n") }        
        file.write("end\n\n")
      
      end
    end
    
  end
  
end

def mock_values(table_name, columns)
  
  # Find the longest column name to format the strings
  #
  strlen = columns.map{ |col| col.name.length }.max
  
  columns.inject([]) do |arr, col|
    method_s = "#{table_name.to_s[0]}.#{col.name}"
    mock_val = send("mock_#{col.type.to_s}_types", col.name)
    arr.push("  #{method_s} ".concat((" " * (strlen - col.name.length))).concat(mock_val))
  end
  
end

def mock_string_types(cname)
  
  string_val =  
  if    cname.match(/email/i);       "test@testing.com";
  elsif cname.match(/first_name/i);  "Test";
  elsif cname.match(/last_name/i);   "McTesterson";
  elsif cname.downcase == "address"; "1234 Somewhere St";
  elsif cname.downcase == "city";    "Richmond";
  elsif cname.downcase == "state";   "Virginia";
  elsif cname.match(/zip/i) or cname.match(/zip_code/i); "23219";
  else ""
  end
  
  return "\"#{string_val}\""
  
end

def mock_integer_types(cname)
  return '1'
end

def mock_decimal_types(cname)
  return '1.0'
end

def mock_boolean_types(cname)
  return "true"
end

def mock_datetime_types(cname)
  return "DateTime.now"
end

def mock_date_types(cname)
  return "Date.today"
end

def mock_time_types(cname)
  return "Time.now"
end

def mock_text_types(cname)
  return "\"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\""
end