Checkout of Instiki Trunk 1/21/2007.

vendor/rails/activerecord/examples/validation.rb

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+require File.dirname(__FILE__) + '/shared_setup'
+
+logger = Logger.new(STDOUT)
+
+# Database setup ---------------
+
+logger.info "\nCreate tables"
+
+[ "DROP TABLE people",
+  "CREATE TABLE people (id int(11) auto_increment, name varchar(100), pass varchar(100), email varchar(100), PRIMARY KEY (id))"
+].each { |statement|
+  begin; ActiveRecord::Base.connection.execute(statement); rescue ActiveRecord::StatementInvalid; end # Tables doesn't necessarily already exist
+}
+
+
+# Class setup ---------------
+
+class Person < ActiveRecord::Base
+  # Using 
+  def self.authenticate(name, pass)
+    # find_first "name = '#{name}' AND pass = '#{pass}'" would be open to sql-injection (in a web-app scenario)
+    find_first [ "name = '%s' AND pass = '%s'", name, pass ]
+  end
+
+  def self.name_exists?(name, id = nil)
+    if id.nil?
+      condition = [ "name = '%s'", name ]
+    else
+      # Check if anyone else than the person identified by person_id has that user_name
+      condition = [ "name = '%s' AND id <> %d", name, id ]
+    end
+
+    !find_first(condition).nil?
+  end
+
+  def email_address_with_name
+    "\"#{name}\" <#{email}>"
+  end
+        
+  protected
+    def validate
+      errors.add_on_empty(%w(name pass email))
+      errors.add("email", "must be valid") unless email_address_valid?
+    end
+
+    def validate_on_create
+      if attribute_present?("name") && Person.name_exists?(name)
+          errors.add("name", "is already taken by another person")
+      end
+    end
+
+    def validate_on_update
+      if attribute_present?("name") && Person.name_exists?(name, id)
+          errors.add("name", "is already taken by another person")
+      end
+    end
+  
+  private
+    def email_address_valid?() email =~ /\w[-.\w]*\@[-\w]+[-.\w]*\.\w+/ end
+end
+
+# Usage ---------------
+
+logger.info "\nCreate fixtures"
+david = Person.new("name" => "David Heinemeier Hansson", "pass" => "", "email" => "")
+unless david.save
+  puts "There was #{david.errors.count} error(s)"
+  david.errors.each_full { |error| puts error }
+end
+
+david.pass = "something"
+david.email = "invalid_address"
+unless david.save
+  puts "There was #{david.errors.count} error(s)"
+  puts "It was email with: " + david.errors.on("email")
+end
+
+david.email = "david@loudthinking.com"
+if david.save then puts "David finally made it!" end
+
+
+another_david = Person.new("name" => "David Heinemeier Hansson", "pass" => "xc", "email" => "david@loudthinking")
+unless another_david.save
+  puts "Error on name: " + another_david.errors.on("name")
+end