Initial import.

git-svn-id: http://svn.ruido-blanco.net/dependent_protect/trunk@1 246b335f-cd19-0410-9f1f-de397f2a1261

MIT-LICENSE

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+Copyright (c) 2006 Daniel Rodríguez Troitiño
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README

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+dependent => :protect option
+============================
+
+Adds a new option :protect for the parameter :depends from has_many method.
+This option forbids destroying records with associated records in a
+association created with :dependent => :protect option, more or less like
+"ON DELETE RESTRICT" SQL statement. If you try to destroy a record with
+associated records it will raise a ReferentialIntegrityProtectionError (defined
+also in this plugin).
+
+Based on the idea and the code from [email protected] in Ruby on Rails
+ticket #3837 (http://dev.rubyonrails.org/ticket/3837).
+
+You can download this plugin at:
+
+http://svn.ruido-blanco.net/dependent_protect/trunk
+
+Author
+======
+
+Daniel Rodríguez Troitiño <[email protected]>, based on the ideas and
+the code from <[email protected]>.

Rakefile

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+require 'rake'
+require 'rake/testtask'
+require 'rake/rdoctask'
+
+desc 'Default: run unit tests.'
+task :default => :test
+
+desc 'Test the dependent_protect plugin.'
+Rake::TestTask.new(:test) do |t|
+  t.libs << 'lib'
+  t.pattern = 'test/**/*_test.rb'
+  t.verbose = true
+end
+
+desc 'Generate documentation for the dependent_protect plugin.'
+Rake::RDocTask.new(:rdoc) do |rdoc|
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.title    = 'DependentProtect'
+  rdoc.options << '--line-numbers' << '--inline-source'
+  rdoc.rdoc_files.include('README')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+end

init.rb

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+# Include hook code here
+
+require 'dependent_protect'

lib/dependent_protect.rb

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+# DependentProtect
+
+module ActiveRecord
+  module Associations
+    module ClassMethods
+
+      alias_method :has_many_without_protect, :has_many
+
+      # We should be aliasing configure_dependency_for_has_many but that method
+      # is private so we can't. We alias has_many instead trying to be as fair
+      # as we can to the original behaviour.
+      def has_many_with_protect(association_id, options = {}, &extension) #:nodoc:
+        reflection = create_reflection(:has_many, association_id, options, self)
+
+        # This would break if has_many :dependent behaviour changes. One
+        # solution is removing both the second when and the else branches but
+        # the exception message wouldn't be exact.
+        case reflection.options[:dependent]
+        when :protect
+          module_eval "before_destroy 'raise ReferentialIntegrityProtectionError, \"Can\\'t destroy because there\\'s at least one #{reflection.class_name} in this #{self.class_name}\" if self.#{reflection.name}.find(:first)'"
+          options.delete(:dependent)
+        when true, :destroy, :delete_all, :nullify, nil, false
+          #pass
+        else
+          raise ArgumentError, 'The :dependent option expects either true, :destroy, :delete_all, :nullify or :protect'
+        end
+
+        has_many_without_protect(association_id, options, &extension)
+      end
+
+      alias_method :has_many, :has_many_with_protect
+
+    end
+  end
+
+  class ReferentialIntegrityProtectionError < ActiveRecordError #:nodoc:
+  end
+end

test/database.yml

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+sqlite:
+  :adapter: sqlite
+  :dbfile: dependent_protect.sqlite.db
+sqlite3:
+  :adapter: sqlite3
+  :dbfile: dependent_protect.sqlite3.db
+postgresql:
+  :adapter: postgresql
+  :username: postgres
+  :password: postgres
+  :database: dependent_protect_test
+  :min_messages: ERROR
+mysql:
+  :adapter: mysql
+  :host: localhost
+  :username: rails
+  :password:
+  :database: dependent_protect_test

test/debug.log

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+# Logfile created on Sun Jul 30 03:23:01 CEST 2006 by logger.rb/1.5.2.7
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+  SQL (0.352609)   CREATE TABLE companies ("id" INTEGER PRIMARY KEY NOT NULL, "name" varchar(255), "client_of" integer) 
+  SQL (0.249171)   CREATE TABLE schema_info (version integer)
+  SQL (0.243700)   INSERT INTO schema_info (version) VALUES(0)
+  SQL (0.001462)   PRAGMA table_info(schema_info)
+  SQL (0.233039)   UPDATE schema_info SET version = 1
+  SQL (0.374005)   DROP TABLE companies
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+  SQL (0.001296)   PRAGMA table_info(schema_info)
+  SQL (0.259787)   UPDATE schema_info SET version = 1
+  SQL (0.308970)   DROP TABLE companies
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