diff options
| -rw-r--r-- | activemodel/README | 19 | ||||
| -rw-r--r-- | activemodel/lib/active_model/validations.rb | 39 |
2 files changed, 56 insertions, 2 deletions
diff --git a/activemodel/README b/activemodel/README index 6673427230..d2b51e2390 100644 --- a/activemodel/README +++ b/activemodel/README @@ -175,4 +175,21 @@ functionality from the following modules: end {Learn more}[link:classes/ActiveModel/Translation.html] -
\ No newline at end of file + +* Providing a full Validation stack for your objects... + + class Person + include ActiveModel::Validations + + attr_accessor :first_name, :last_name + + validates_each :first_name, :last_name do |record, attr, value| + record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z + end + end + + person = Person.new(:first_name => 'zoolander') + person.valid? #=> false + + {Learn more}[link:classes/ActiveModel/Validations.html] + diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb index 276472ea46..03733a9c89 100644 --- a/activemodel/lib/active_model/validations.rb +++ b/activemodel/lib/active_model/validations.rb @@ -3,6 +3,41 @@ require 'active_support/core_ext/hash/keys' require 'active_model/errors' module ActiveModel + + # Provides a full validation framework to your objects. + # + # A minimal implementation could be: + # + # class Person + # include ActiveModel::Validations + # + # attr_accessor :first_name, :last_name + # + # validates_each :first_name, :last_name do |record, attr, value| + # record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z + # end + # end + # + # Which provides you with the full standard validation stack that you + # know from ActiveRecord. + # + # person = Person.new + # person.valid? + # #=> true + # person.invalid? + # #=> false + # person.first_name = 'zoolander' + # person.valid? + # #=> false + # person.invalid? + # #=> true + # person.errors + # #=> #<OrderedHash {:first_name=>["starts with z."]}> + # + # Note that ActiveModel::Validations automatically adds an +errors+ method + # to your instances initialized with a new ActiveModel::Errors object, so + # there is no need for you to add this manually. + # module Validations extend ActiveSupport::Concern include ActiveSupport::Callbacks @@ -18,8 +53,10 @@ module ActiveModel # class Person # include ActiveModel::Validations # + # attr_accessor :first_name, :last_name + # # validates_each :first_name, :last_name do |record, attr, value| - # record.errors.add attr, 'starts with z.' if value[0] == ?z + # record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z # end # end # |