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Minggu, 21 November 2010

rails http status code and symbol

Status Code	Status Message	Symbol
1xx Informational
100	Continue	:continue
101	Switching Protocols	:switching_protocols
102	Processing	:processing

2xx Success
200	OK	:ok
201	Created	:created
202	Accepted	:accepted
203	Non-Authoritative Information	:non_authoritative_information
204	No Content	:no_content
205	Reset Content	:reset_content
206	Partial Content	:partial_content
207	Multi-Status	:multi_status
226	IM Used	:im_used

3xx Redirection
300	Multiple Choices	:multiple_choices
301	Moved Permanently	:moved_permanently
302	Found	:found
303	See Other	:see_other
304	Not Modified	:not_modified
305	Use Proxy	:use_proxy
307	Temporary Redirect	:temporary_redirect

4xx Client Error
400	Bad Request	:bad_request
401	Unauthorized	:unauthorized
402	Payment Required	:payment_required
403	Forbidden	:forbidden
404	Not Found	:not_found
405	Method Not Allowed	:method_not_allowed
406	Not Acceptable	:not_acceptable
407	Proxy Authentication Required	:proxy_authentication_required
408	Request Timeout	:request_timeout
409	Conflict	:conflict
410	Gone	:gone
411	Length Required	:length_required
412	Precondition Failed	:precondition_failed
413	Request Entity Too Large	:request_entity_too_large
414	Request-URI Too Long	:request_uri_too_long
415	Unsupported Media Type	:unsupported_media_type
416	Requested Range Not Satisfiable	:requested_range_not_satisfiable
417	Expectation Failed	:expectation_failed
422	Unprocessable Entity	:unprocessable_entity
423	Locked	:locked
424	Failed Dependency	:failed_dependency
426	Upgrade Required	:upgrade_required

5xx Server Error
500	Internal Server Error	:internal_server_error
501	Not Implemented	:not_implemented
502	Bad Gateway	:bad_gateway
503	Service Unavailable	:service_unavailable
504	Gateway Timeout	:gateway_timeout
505	HTTP Version Not Supported	:http_version_not_supported
507	Insufficient Storage	:insufficient_storage
510	Not Extended	:not_extended

source: http://www.codyfauser.com/2008/7/4/rails-http-status-code-to-symbol-mapping

Rabu, 17 November 2010

[shared] array/hash support for system_settings

https://github.com/realityforge/rails-system-settings


# system_settings/lib/system_setting.rb

class SystemSetting < ActiveRecord::Base
  @@data = {}

  validates_length_of :name, :in => 1..255
  validates_uniqueness_of :name

  serialize :value

  def self.[](name)
    name = name.to_s unless name.is_a? String
    return @@data[name] unless @@data[name].nil?
    p = SystemSetting.find_by_name(name)
    @@data[name] = p ? p.value.freeze : nil
  end

  def self.[]=(name, value)
    name = name.to_s unless name.is_a? String
    p = SystemSetting.find_or_initialize_by_name(name)
    @@data[name] = p.value = value
    p.save!
    p.value.freeze
  end
end

[shared] Unsigned int support for migration

currently rails only allow signed int for migration, but for best practice it's better to use unsigned int for some cases

you can force migration to unsigned int by doing something like this


  t.column :unsigned_value, "integer unsigned"

but that kinda ugly to see.
luckily rob anderton (thewebfellas.com) already created monkey patch to add unsigned support: http://thewebfellas.com/assets/2008/9/30/active_record_unsigned.rb

the patch will add :unsigned option in migration so you can do something like this:


  t.integer :unsigned_value, :unsigned => true

furthermore the patch will make default table id and foreign key to unsigned int(11), but make sure to use t.references to create foreign key or simply use :unsigned => true

important things:

- for existing project this patch might break table relation because it will create unsigned int foreign key but the primary key might be signed int from old migration
- some plugin like role_requirement will generate migration that using t.integer for foreign key instead of t.references, you need to change this manually
- the patch will only change mysql adapter, so it will not work for other adapter

[shared] Rails migration integer limit

:limit	Numeric Type	Column Size	Signed Max value	Unsigned Max value
1	TINYINT(4)	1 byte	127	255
2	SMALLINT(6)	2 bytes	32767	65535
3	MEDIUMINT(9)	3 bytes	8388607	16777215
4 and others	INT(11)	4 bytes	2147483647	4294967295
5..8	BIGINT(20)	8 bytes	9223372036854775807	18446744073709551615

Minggu, 14 November 2010

[shared] rails user role system

https://github.com/timcharper/role_requirement

installation:
- ruby script/generate roles Role User

installation will do:

Generates habtm table, creates role.rb with the habtm declaration. Adds declaration in user.rb (scans the code for "class User < ActiveRecord::Base", and puts the new code right after it.

Creates an admin user in users.yml, with a role named admin in roles.yml, including a fixture to demonstrate how to relate roles to users in roles_users.yml

Modify the user.rb (or corresponding user model) file, add the instance method has_role?

Generates RoleRequirementSystem against for the corresponding user model.

Generates a migration to make the necessary database changes

Scans ApplicationController, inserts the lines "include AuthenticatedSystem", and "include RoleRequirementSystem", if not already included.

Scans test_helper.rb and adds "includes RoleRequirementTestHelpers", if not already included.

Usage:
- add require_role "role_name" in controller, similar to before_filter

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