diff options
23 files changed, 169 insertions, 74 deletions
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb index fff44e50c1..44c7382f72 100644 --- a/actionmailer/lib/action_mailer/base.rb +++ b/actionmailer/lib/action_mailer/base.rb @@ -395,7 +395,7 @@ module ActionMailer #:nodoc: end # Wraps an email delivery inside of Active Support Notifications instrumentation. This - # method is actually called by the <tt>Mail::Message</tt> object itself through a call back + # method is actually called by the <tt>Mail::Message</tt> object itself through a callback # when you call <tt>:deliver</tt> on the Mail::Message, calling +deliver_mail+ directly # and passing a Mail::Message will do nothing except tell the logger you sent the email. def deliver_mail(mail) #:nodoc: diff --git a/activemodel/lib/active_model/callbacks.rb b/activemodel/lib/active_model/callbacks.rb index 257644b3fa..e7aad17021 100644 --- a/activemodel/lib/active_model/callbacks.rb +++ b/activemodel/lib/active_model/callbacks.rb @@ -2,11 +2,11 @@ require 'active_support/core_ext/array/wrap' require 'active_support/callbacks' module ActiveModel - # == Active Model Call Backs + # == Active Model Callbacks # # Provides an interface for any class to have Active Record like callbacks. # - # Like the Active Record methods, the call back chain is aborted as soon as + # Like the Active Record methods, the callback chain is aborted as soon as # one of the methods in the chain returns false. # # First, extend ActiveModel::Callbacks from the class you are creating: @@ -15,13 +15,13 @@ module ActiveModel # extend ActiveModel::Callbacks # end # - # Then define a list of methods that you want call backs attached to: + # Then define a list of methods that you want callbacks attached to: # # define_model_callbacks :create, :update # # This will provide all three standard callbacks (before, around and after) around # both the :create and :update methods. To implement, you need to wrap the methods - # you want call backs on in a block so that the call backs get a chance to fire: + # you want callbacks on in a block so that the callbacks get a chance to fire: # # def create # _run_create_callbacks do @@ -61,7 +61,7 @@ module ActiveModel # # define_model_callbacks :initializer, :only => :after # - # Note, the <tt>:only => <type></tt> hash will apply to all call backs defined on + # Note, the <tt>:only => <type></tt> hash will apply to all callbacks defined on # that method call. To get around this you can call the define_model_callbacks # method as many times as you need. # @@ -72,8 +72,8 @@ module ActiveModel # Would create +after_create+, +before_update+ and +around_destroy+ methods only. # # You can pass in a class to before_<type>, after_<type> and around_<type>, in which - # case the call back will call that class's <action>_<type> method passing the object - # that the call back is being called on. + # case the callback will call that class's <action>_<type> method passing the object + # that the callback is being called on. # # class MyModel # extend ActiveModel::Callbacks @@ -84,7 +84,7 @@ module ActiveModel # # class AnotherClass # def self.before_create( obj ) - # # obj is the MyModel instance that the call back is being called on + # # obj is the MyModel instance that the callback is being called on # end # end # diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb index a82ce1bee0..4c80863e3a 100644 --- a/activemodel/lib/active_model/dirty.rb +++ b/activemodel/lib/active_model/dirty.rb @@ -4,7 +4,7 @@ require 'active_support/hash_with_indifferent_access' require 'active_support/core_ext/object/duplicable' module ActiveModel - # == Active Model Call Backs + # == Active Model Dirty # # Provides a way to track changes in your object in the same way as # Active Record does. diff --git a/activemodel/lib/active_model/validations/acceptance.rb b/activemodel/lib/active_model/validations/acceptance.rb index 26b12b504b..77c401e0cc 100644 --- a/activemodel/lib/active_model/validations/acceptance.rb +++ b/activemodel/lib/active_model/validations/acceptance.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Acceptance Validator module Validations class AcceptanceValidator < EachValidator def initialize(options) @@ -22,29 +24,42 @@ module ActiveModel end module HelperMethods - # Encapsulates the pattern of wanting to validate the acceptance of a terms of service check box (or similar agreement). Example: + # Encapsulates the pattern of wanting to validate the acceptance of a + # terms of service check box (or similar agreement). Example: # # class Person < ActiveRecord::Base # validates_acceptance_of :terms_of_service # validates_acceptance_of :eula, :message => "must be abided" # end # - # If the database column does not exist, the +terms_of_service+ attribute is entirely virtual. This check is - # performed only if +terms_of_service+ is not +nil+ and by default on save. + # If the database column does not exist, the +terms_of_service+ attribute + # is entirely virtual. This check is performed only if +terms_of_service+ + # is not +nil+ and by default on save. # # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "must be accepted"). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is true). - # * <tt>:accept</tt> - Specifies value that is considered accepted. The default value is a string "1", which - # makes it easy to relate to an HTML checkbox. This should be set to +true+ if you are validating a database - # column, since the attribute is typecast from "1" to +true+ before validation. - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. + # * <tt>:message</tt> - A custom error message (default is: "must be + # accepted"). + # * <tt>:on</tt> - Specifies when this validation is active (default is + # <tt>:save</tt>, other options are <tt>:create</tt> and + # <tt>:update</tt>). + # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default + # is true). + # * <tt>:accept</tt> - Specifies value that is considered accepted. + # The default value is a string "1", which makes it easy to relate to + # an HTML checkbox. This should be set to +true+ if you are validating + # a database column, since the attribute is typecast from "1" to +true+ + # before validation. + # * <tt>:if</tt> - Specifies a method, proc or string to call to determine + # if the validation should occur (e.g. <tt>:if => :allow_validation</tt>, + # or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The + # method, proc or string should return or evaluate to a true or false + # value. + # * <tt>:unless</tt> - Specifies a method, proc or string to call to + # determine if the validation should not occur (for example, + # <tt>:unless => :skip_validation</tt>, or + # <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). + # The method, proc or string should return or evaluate to a true or + # false value. def validates_acceptance_of(*attr_names) validates_with AcceptanceValidator, _merge_attributes(attr_names) end diff --git a/activemodel/lib/active_model/validations/confirmation.rb b/activemodel/lib/active_model/validations/confirmation.rb index 51445343f2..5e13db7491 100644 --- a/activemodel/lib/active_model/validations/confirmation.rb +++ b/activemodel/lib/active_model/validations/confirmation.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Confirmation Validator module Validations class ConfirmationValidator < EachValidator def validate_each(record, attribute, value) @@ -13,33 +15,45 @@ module ActiveModel end module HelperMethods - # Encapsulates the pattern of wanting to validate a password or email address field with a confirmation. Example: + # Encapsulates the pattern of wanting to validate a password or email + # address field with a confirmation. For example: # # Model: # class Person < ActiveRecord::Base # validates_confirmation_of :user_name, :password - # validates_confirmation_of :email_address, :message => "should match confirmation" + # validates_confirmation_of :email_address, + # :message => "should match confirmation" # end # # View: # <%= password_field "person", "password" %> # <%= password_field "person", "password_confirmation" %> # - # The added +password_confirmation+ attribute is virtual; it exists only as an in-memory attribute for validating the password. - # To achieve this, the validation adds accessors to the model for the confirmation attribute. NOTE: This check is performed - # only if +password_confirmation+ is not +nil+, and by default only on save. To require confirmation, make sure to add a presence - # check for the confirmation attribute: + # The added +password_confirmation+ attribute is virtual; it exists only + # as an in-memory attribute for validating the password. To achieve this, + # the validation adds accessors to the model for the confirmation + # attribute. + # + # NOTE: This check is performed only if +password_confirmation+ is not + # +nil+, and by default only on save. To require confirmation, make sure + # to add a presence check for the confirmation attribute: # # validates_presence_of :password_confirmation, :if => :password_changed? # # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "doesn't match confirmation"). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The + # * <tt>:message</tt> - A custom error message (default is: "doesn't match + # confirmation"). + # * <tt>:on</tt> - Specifies when this validation is active (default is + # <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). + # * <tt>:if</tt> - Specifies a method, proc or string to call to determine + # if the validation should occur (e.g. <tt>:if => :allow_validation</tt>, + # or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The + # method, proc or string should return or evaluate to a true or false + # value. + # * <tt>:unless</tt> - Specifies a method, proc or string to call to + # determine if the validation should not occur (e.g. + # <tt>:unless => :skip_validation</tt>, or + # <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The # method, proc or string should return or evaluate to a true or false value. def validates_confirmation_of(*attr_names) validates_with ConfirmationValidator, _merge_attributes(attr_names) diff --git a/activemodel/lib/active_model/validations/exclusion.rb b/activemodel/lib/active_model/validations/exclusion.rb index 2ee78f5dd2..599623368f 100644 --- a/activemodel/lib/active_model/validations/exclusion.rb +++ b/activemodel/lib/active_model/validations/exclusion.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Exclusion Validator module Validations class ExclusionValidator < EachValidator def check_validity! diff --git a/activemodel/lib/active_model/validations/format.rb b/activemodel/lib/active_model/validations/format.rb index c34c860d4d..3b57d4fd77 100644 --- a/activemodel/lib/active_model/validations/format.rb +++ b/activemodel/lib/active_model/validations/format.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Format Validator module Validations class FormatValidator < EachValidator def validate_each(record, attribute, value) diff --git a/activemodel/lib/active_model/validations/inclusion.rb b/activemodel/lib/active_model/validations/inclusion.rb index 446646d247..e9940dbbf0 100644 --- a/activemodel/lib/active_model/validations/inclusion.rb +++ b/activemodel/lib/active_model/validations/inclusion.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Inclusion Validator module Validations class InclusionValidator < EachValidator def check_validity! diff --git a/activemodel/lib/active_model/validations/length.rb b/activemodel/lib/active_model/validations/length.rb index d7218f4f52..dc191d3150 100644 --- a/activemodel/lib/active_model/validations/length.rb +++ b/activemodel/lib/active_model/validations/length.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Length Validator module Validations class LengthValidator < EachValidator MESSAGES = { :is => :wrong_length, :minimum => :too_short, :maximum => :too_long }.freeze diff --git a/activemodel/lib/active_model/validations/numericality.rb b/activemodel/lib/active_model/validations/numericality.rb index 062b4cd17f..c2e7223939 100644 --- a/activemodel/lib/active_model/validations/numericality.rb +++ b/activemodel/lib/active_model/validations/numericality.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model Numericality Validator module Validations class NumericalityValidator < EachValidator CHECKS = { :greater_than => :>, :greater_than_or_equal_to => :>=, diff --git a/activemodel/lib/active_model/validations/presence.rb b/activemodel/lib/active_model/validations/presence.rb index b319f4834b..e36bee8115 100644 --- a/activemodel/lib/active_model/validations/presence.rb +++ b/activemodel/lib/active_model/validations/presence.rb @@ -1,6 +1,8 @@ require 'active_support/core_ext/object/blank' module ActiveModel + + # == Active Model Presence Validator module Validations class PresenceValidator < EachValidator def validate(record) diff --git a/activemodel/lib/active_model/validations/validates.rb b/activemodel/lib/active_model/validations/validates.rb index 57162996c2..0674640925 100644 --- a/activemodel/lib/active_model/validations/validates.rb +++ b/activemodel/lib/active_model/validations/validates.rb @@ -1,6 +1,8 @@ require 'active_support/core_ext/hash/slice' module ActiveModel + + # == Active Model validates method module Validations module ClassMethods # This method is a shortcut to all default validators and any custom diff --git a/activemodel/lib/active_model/validations/with.rb b/activemodel/lib/active_model/validations/with.rb index 6dbde5bfad..a2e870d714 100644 --- a/activemodel/lib/active_model/validations/with.rb +++ b/activemodel/lib/active_model/validations/with.rb @@ -1,4 +1,6 @@ module ActiveModel + + # == Active Model validates_with method module Validations module HelperMethods private diff --git a/activerecord/lib/active_record/aggregations.rb b/activerecord/lib/active_record/aggregations.rb index 45aaea062d..51ffc7542c 100644 --- a/activerecord/lib/active_record/aggregations.rb +++ b/activerecord/lib/active_record/aggregations.rb @@ -1,4 +1,5 @@ module ActiveRecord + # = Active Record Aggregations module Aggregations # :nodoc: extend ActiveSupport::Concern diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb index c117271c71..56e18eced0 100644 --- a/activerecord/lib/active_record/attribute_methods.rb +++ b/activerecord/lib/active_record/attribute_methods.rb @@ -1,6 +1,7 @@ require 'active_support/core_ext/enumerable' module ActiveRecord + # = Active Record Attribute Methods module AttributeMethods #:nodoc: extend ActiveSupport::Concern include ActiveModel::AttributeMethods diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb index 154d6ba8e5..c378e19864 100644 --- a/activerecord/lib/active_record/autosave_association.rb +++ b/activerecord/lib/active_record/autosave_association.rb @@ -1,6 +1,8 @@ require 'active_support/core_ext/array/wrap' module ActiveRecord + # = Active Record Autosave Association + # # AutosaveAssociation is a module that takes care of automatically saving # your associations when the parent is saved. In addition to saving, it # also destroys any associations that were marked for destruction. diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb index ce7259e96b..93249fc96c 100755 --- a/activerecord/lib/active_record/base.rb +++ b/activerecord/lib/active_record/base.rb @@ -21,6 +21,8 @@ require 'arel' require 'active_record/errors' module ActiveRecord #:nodoc: + # = Active Record + # # Active Record objects don't specify their attributes directly, but rather infer them from the table definition with # which they're linked. Adding, removing, and changing attributes and their type is done directly in the database. Any change # is instantly reflected in the Active Record objects. The mapping that binds a given Active Record class to a certain diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb index 44fee12001..7b7de0b070 100644 --- a/activerecord/lib/active_record/callbacks.rb +++ b/activerecord/lib/active_record/callbacks.rb @@ -1,6 +1,8 @@ require 'active_support/core_ext/array/wrap' module ActiveRecord + # = Active Record Callbacks + # # Callbacks are hooks into the lifecycle of an Active Record object that allow you to trigger logic # before or after an alteration of the object state. This can be used to make sure that associated and # dependent objects are deleted when +destroy+ is called (by overwriting +before_destroy+) or to massage attributes diff --git a/activerecord/lib/active_record/counter_cache.rb b/activerecord/lib/active_record/counter_cache.rb index 9601ed6afd..999322129a 100644 --- a/activerecord/lib/active_record/counter_cache.rb +++ b/activerecord/lib/active_record/counter_cache.rb @@ -1,4 +1,5 @@ module ActiveRecord + # = Active Record Counter Cache module CounterCache # Resets one or more counter caches to their correct value using an SQL # count query. This is useful when adding new counter caches, or if the diff --git a/activerecord/lib/active_record/dynamic_finder_match.rb b/activerecord/lib/active_record/dynamic_finder_match.rb index fa7a19487c..b39b291352 100644 --- a/activerecord/lib/active_record/dynamic_finder_match.rb +++ b/activerecord/lib/active_record/dynamic_finder_match.rb @@ -1,4 +1,9 @@ module ActiveRecord + + # = Active Record Dynamic Finder Match + # + # Provides dynamic attribute-based finders such as <tt>find_by_country</tt> + # if, for example, the <tt>Person</tt> has an attribute with that name. class DynamicFinderMatch def self.match(method) df_match = self.new(method) diff --git a/activerecord/lib/active_record/dynamic_scope_match.rb b/activerecord/lib/active_record/dynamic_scope_match.rb index f796ba669a..15f65be6bc 100644 --- a/activerecord/lib/active_record/dynamic_scope_match.rb +++ b/activerecord/lib/active_record/dynamic_scope_match.rb @@ -1,4 +1,11 @@ module ActiveRecord + + # = Active Record Dynamic Scope Match + # + # Provides dynamic attribute-based scopes such as <tt>scoped_by_price(4.99)</tt> + # if, for example, the <tt>Product</tt> has an attribute with that name. You can + # chain more <tt>scoped_by_* </tt> methods after the other. It acts like a named + # scope except that it's dynamic. class DynamicScopeMatch def self.match(method) ds_match = self.new(method) diff --git a/activerecord/lib/active_record/errors.rb b/activerecord/lib/active_record/errors.rb index cf5ddca2ba..7aa725d095 100644 --- a/activerecord/lib/active_record/errors.rb +++ b/activerecord/lib/active_record/errors.rb @@ -1,4 +1,7 @@ module ActiveRecord + + # = Active Record Errors + # # Generic Active Record exception class. class ActiveRecordError < StandardError end diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index 940f825038..4a1d6ac758 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -29,11 +29,15 @@ module ActiveRecord end end - # Migrations can manage the evolution of a schema used by several physical databases. It's a solution - # to the common problem of adding a field to make a new feature work in your local database, but being unsure of how to - # push that change to other developers and to the production server. With migrations, you can describe the transformations - # in self-contained classes that can be checked into version control systems and executed against another database that - # might be one, two, or five versions behind. + # Active Record Migrations + # + # Migrations can manage the evolution of a schema used by several physical + # databases. It's a solution to the common problem of adding a field to make + # a new feature work in your local database, but being unsure of how to + # push that change to other developers and to the production server. With + # migrations, you can describe the transformations in self-contained classes + # that can be checked into version control systems and executed against + # another database that might be one, two, or five versions behind. # # Example of a simple migration: # @@ -47,10 +51,13 @@ module ActiveRecord # end # end # - # This migration will add a boolean flag to the accounts table and remove it if you're backing out of the migration. - # It shows how all migrations have two class methods +up+ and +down+ that describes the transformations required to implement - # or remove the migration. These methods can consist of both the migration specific methods like add_column and remove_column, - # but may also contain regular Ruby code for generating data needed for the transformations. + # This migration will add a boolean flag to the accounts table and remove it + # if you're backing out of the migration. It shows how all migrations have + # two class methods +up+ and +down+ that describes the transformations + # required to implement or remove the migration. These methods can consist + # of both the migration specific methods like add_column and remove_column, + # but may also contain regular Ruby code for generating data needed for the + # transformations. # # Example of a more complex migration that also needs to initialize data: # @@ -64,7 +71,9 @@ module ActiveRecord # t.integer :position # end # - # SystemSetting.create :name => "notice", :label => "Use notice?", :value => 1 + # SystemSetting.create :name => "notice", + # :label => "Use notice?", + # :value => 1 # end # # def self.down @@ -72,35 +81,49 @@ module ActiveRecord # end # end # - # This migration first adds the system_settings table, then creates the very first row in it using the Active Record model - # that relies on the table. It also uses the more advanced create_table syntax where you can specify a complete table schema - # in one block call. + # This migration first adds the system_settings table, then creates the very + # first row in it using the Active Record model that relies on the table. It + # also uses the more advanced create_table syntax where you can specify a + # complete table schema in one block call. # # == Available transformations # - # * <tt>create_table(name, options)</tt> Creates a table called +name+ and makes the table object available to a block - # that can then add columns to it, following the same format as add_column. See example above. The options hash is for - # fragments like "DEFAULT CHARSET=UTF-8" that are appended to the create table definition. + # * <tt>create_table(name, options)</tt> Creates a table called +name+ and + # makes the table object available to a block that can then add columns to it, + # following the same format as add_column. See example above. The options hash + # is for fragments like "DEFAULT CHARSET=UTF-8" that are appended to the create + # table definition. # * <tt>drop_table(name)</tt>: Drops the table called +name+. - # * <tt>rename_table(old_name, new_name)</tt>: Renames the table called +old_name+ to +new_name+. - # * <tt>add_column(table_name, column_name, type, options)</tt>: Adds a new column to the table called +table_name+ + # * <tt>rename_table(old_name, new_name)</tt>: Renames the table called +old_name+ + # to +new_name+. + # * <tt>add_column(table_name, column_name, type, options)</tt>: Adds a new column + # to the table called +table_name+ # named +column_name+ specified to be one of the following types: - # <tt>:string</tt>, <tt>:text</tt>, <tt>:integer</tt>, <tt>:float</tt>, <tt>:decimal</tt>, <tt>:datetime</tt>, <tt>:timestamp</tt>, <tt>:time</tt>, - # <tt>:date</tt>, <tt>:binary</tt>, <tt>:boolean</tt>. A default value can be specified by passing an - # +options+ hash like <tt>{ :default => 11 }</tt>. Other options include <tt>:limit</tt> and <tt>:null</tt> (e.g. <tt>{ :limit => 50, :null => false }</tt>) - # -- see ActiveRecord::ConnectionAdapters::TableDefinition#column for details. - # * <tt>rename_column(table_name, column_name, new_column_name)</tt>: Renames a column but keeps the type and content. - # * <tt>change_column(table_name, column_name, type, options)</tt>: Changes the column to a different type using the same - # parameters as add_column. - # * <tt>remove_column(table_name, column_name)</tt>: Removes the column named +column_name+ from the table called +table_name+. - # * <tt>add_index(table_name, column_names, options)</tt>: Adds a new index with the name of the column. Other options include - # <tt>:name</tt> and <tt>:unique</tt> (e.g. <tt>{ :name => "users_name_index", :unique => true }</tt>). - # * <tt>remove_index(table_name, index_name)</tt>: Removes the index specified by +index_name+. + # <tt>:string</tt>, <tt>:text</tt>, <tt>:integer</tt>, <tt>:float</tt>, + # <tt>:decimal</tt>, <tt>:datetime</tt>, <tt>:timestamp</tt>, <tt>:time</tt>, + # <tt>:date</tt>, <tt>:binary</tt>, <tt>:boolean</tt>. A default value can be + # specified by passing an +options+ hash like <tt>{ :default => 11 }</tt>. + # Other options include <tt>:limit</tt> and <tt>:null</tt> (e.g. + # <tt>{ :limit => 50, :null => false }</tt>) -- see + # ActiveRecord::ConnectionAdapters::TableDefinition#column for details. + # * <tt>rename_column(table_name, column_name, new_column_name)</tt>: Renames + # a column but keeps the type and content. + # * <tt>change_column(table_name, column_name, type, options)</tt>: Changes + # the column to a different type using the same parameters as add_column. + # * <tt>remove_column(table_name, column_name)</tt>: Removes the column named + # +column_name+ from the table called +table_name+. + # * <tt>add_index(table_name, column_names, options)</tt>: Adds a new index + # with the name of the column. Other options include + # <tt>:name</tt> and <tt>:unique</tt> (e.g. + # <tt>{ :name => "users_name_index", :unique => true }</tt>). + # * <tt>remove_index(table_name, index_name)</tt>: Removes the index specified + # by +index_name+. # # == Irreversible transformations # - # Some transformations are destructive in a manner that cannot be reversed. Migrations of that kind should raise - # an <tt>ActiveRecord::IrreversibleMigration</tt> exception in their +down+ method. + # Some transformations are destructive in a manner that cannot be reversed. + # Migrations of that kind should raise an <tt>ActiveRecord::IrreversibleMigration</tt> + # exception in their +down+ method. # # == Running migrations from within Rails # @@ -110,13 +133,15 @@ module ActiveRecord # rails generate migration MyNewMigration # # where MyNewMigration is the name of your migration. The generator will - # create an empty migration file <tt>timestamp_my_new_migration.rb</tt> in the <tt>db/migrate/</tt> - # directory where <tt>timestamp</tt> is the UTC formatted date and time that the migration was generated. + # create an empty migration file <tt>timestamp_my_new_migration.rb</tt> + # in the <tt>db/migrate/</tt> directory where <tt>timestamp</tt> is the + # UTC formatted date and time that the migration was generated. # # You may then edit the <tt>self.up</tt> and <tt>self.down</tt> methods of # MyNewMigration. # # There is a special syntactic shortcut to generate migrations that add fields to a table. + # # rails generate migration add_fieldname_to_tablename fieldname:string # # This will generate the file <tt>timestamp_add_fieldname_to_tablename</tt>, which will look like this: @@ -191,9 +216,10 @@ module ActiveRecord # # == Using a model after changing its table # - # Sometimes you'll want to add a column in a migration and populate it immediately after. In that case, you'll need - # to make a call to Base#reset_column_information in order to ensure that the model has the latest column data from - # after the new column was added. Example: + # Sometimes you'll want to add a column in a migration and populate it + # immediately after. In that case, you'll need to make a call to + # <tt>Base#reset_column_information</tt> in order to ensure that the model has the + # latest column data from after the new column was added. Example: # # class AddPeopleSalary < ActiveRecord::Migration # def self.up |