A5 Errors in Java

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A5 Errors
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A41 active model/dirtyrb
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changed
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Gets an array of fields whos values have changed on the object
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changed
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Returns whether or not the object s attributes have changed
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changed attributes
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Returns a Hash of the fields that have changed with their original values
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changes
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Returns a Hash of changes, with the attribute names as the keys, and the values being an array of the old and new value for that field
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previous changes
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Returns a Hash of previous changes before the object was persisted, with the attribute names as the keys, and the values being an array of the old and new value for that field
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A5 Errors
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Errors is a class that provides a common interface for handling application error
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messages Note that in order for your object to be compatible with the Errors API with i18n and validations support, it needs to extend ActiveModel::Naming, ActiveModel::Translations, and include ActiveModel::Validations
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class User extend ActiveModel::Naming extend ActiveModel::Translations include ActiveModel::Validations attr_reader :errors def initialize @errors = ActiveModel::Errorsnew(self) end end
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Active Model
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Appendix A: Active Model API Reference
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A51 active model/errorsrb
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[](attribute)
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Returns the errors for the supplied attribute as an array
[]=(attribute, error)
Adds the provided error message to the attribute s errors
add(attribute, message = nil, options = {})
Adds an error message for the supplied attribute If no message is provided, :invalid is assumed Options allowed are:
:default A default message for the error
add on blank(attributes, custom message = nil)
Adds an error message for each provided blank attribute name
add on empty(attributes, custom message = nil)
Adds an error message for each provided empty attribute name
count
Returns the total number of error messages
each
Iterates through the error keys, yielding the attribute and the errors for each
empty
Returns whether or not any errors exist
full messages
Returns all the error messages as an array
generate message(attr, message = :invalid, options = {})
Generates a translated error message for the supplied attribute Messages are looked up via the following pattern: modelsMODELattributesATTRIBUTEMESSAGE Options provided can be:
:default A default message for the error
A7 MassAssignmentSecurity
size
Returns the total number of error messages
to a
Returns an array of all the error messages, with the attribute name included in each
to xml
Returns the errors hash as XML
A6 Lint::Tests
You can check whether an object is compatible with the Active Model API by including ActiveModel::Lint::Tests It contains assertions that tell you whether your object is fully compliant The tests only check compatibility They do not attempt to determine the correctness of the returned values For instance, you could implement valid to always return true and the tests would still pass It is up to you to ensure that the values are correct Objects you pass in are expected to return a compliant object from a call to to_model Generally speaking, to_model just returns self
A7 MassAssignmentSecurity
MassAssignmentSecurity is a module that can be included to provided protected and
accessible access to your attributes Mass assignment is defined in Rails as any method or constructor that allows more than one value to be set at the same time The methods provided in this module help prevent fields such as ids and passwords to get accidentally set through the likes of form submissions, etc
Usernew(:first_name => "Joe", :last_name => "Smith") Accountcreate(:name => "Acme")
A71 active model/mass assignment
securityrb
attr protected
Attributes defined as protected do not get their values set when a mass assignment method is called
class User include ActiveModel::MassAssignmentSecurity attr_protected :id, :password
Active Model
Appendix A: Active Model API Reference
def attributes=(props) sanitize_for_mass_assignment(props)each do |key, value| send("#{key}=", value) end end end
attr accessible
Defines a list of attributes that can be set via mass assignment, all others will be protected by default
class User include ActiveModel::MassAssignmentSecurity attr_accessible :first_name, :last_name def attributes=(props) sanitize_for_mass_assignment(props)each do |key, value| send("#{key}=", value) end end end
A8 Name
Name extends String and wraps a bunch of logic around name information about your
object so that it can be used with Rails How much name information could there be Take a look at Name s constructor
def initialize(klass, namespace = nil) super(klassname) @unnamespaced = selfsub(/^#{namespacename}::/, '') if namespace @klass = klass @singular = _singularize(self)freeze @plural = ActiveSupport::Inflectorpluralize(@singular)freeze @element = ActiveSupport::Inflectorunderscore(ActiveSupport::Inflector demodulize(self))freeze @human = ActiveSupport::Inflectorhumanize(@element)freeze @collection = ActiveSupport::Inflectortableize(self)freeze @partial_path = "#{@collection}/#{@element}"freeze @param_key = (namespace _singularize(@unnamespaced) : @singular)freeze @route_key = (namespace ActiveSupport::Inflectorpluralize(@param_key) : @plural)freeze end
All of this information is calculated and stored at initialization-time, presumably since it s used all over Rails
A10
Observer
A81 active model/namingrb
collection
Returns an underscored plural version of the model name
element
Returns an underscored version of the model name
human
Returns a translated human readable version of the model name using I18n The basic recipe is to capitalized the first word of the name
BlogPostmodel_namehuman # => "Blog post"
partial path
Returns collection/element
plural
Returns a pluralized version of the model name
singular
Returns a singularized version of the model name
A9 Naming
Naming is the module that you include in your class to get name type information for
your model
A91 active model/namingrb
model name
Returns an ActiveModel::Name for the object Used by Action Pack to determine routing
Active Model
A10 Observer
Observer is the class to inherit from when creating your own observer to hook into the
lifecycle of your models In order for it to work properly, the model to observe must include ActiveModel::Observing, and the observers must be set up in an initializer or similar
Appendix A: Active Model API Reference
class LoggingObserver < ActiveModel::Observer observe :user, :admin def after_create(object) Railsloggerinfo("#{object} created") end end
A101 active model/observingrb
observe(*models)
Tells what models this observer observes This is useful when the naming does not match the model name or multiple objects need to be observed The models can be classes or symbols
observed class
Returns the default observed class
observe class inherited(subclass)
Sets up the observer to watch subclasses of the observed model
observed classes
Returns an array of the classes this observer observes
update(observed method, object)
Calls the supplied method with the object as the args if the method exists
A11 Observing
Observing is a module to include in your models to set up observers in the lifecycle
of your model Observers are added to the class by calling the observers class method at some point in the application bootstrapping An initializer would be a good fit for this