Class: Lev::BetterActiveModelErrors

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/lev/better_active_model_errors.rb

Overview

Better Errors

Same as ActiveModel::Errors but also retains error types

Provides a modified OrderedHash that you can include in your object for handling error messages and interacting with Action Pack helpers.

A minimal implementation could be:

class Person

  # Required dependency for ActiveModel::Errors
  extend ActiveModel::Naming

  def initialize
    @errors = ActiveModel::Errors.new(self)
  end

  attr_accessor :name
  attr_reader   :errors

  def validate!
    errors.add(:name, "can not be nil") if name == nil
  end

  # The following methods are needed to be minimally implemented

  def read_attribute_for_validation(attr)
    send(attr)
  end

  def Person.human_attribute_name(attr, options = {})
    attr
  end

  def Person.lookup_ancestors
    [self]
  end

end

The last three methods are required in your object for Errors to be able to generate error messages correctly and also handle multiple languages. Of course, if you extend your object with ActiveModel::Translation you will not need to implement the last two. Likewise, using ActiveModel::Validations will handle the validation related methods for you.

The above allows you to do:

p = Person.new
p.validate!             # => ["can not be nil"]
p.errors.full_messages  # => ["name can not be nil"]
# etc..

Constant Summary collapse

CALLBACKS_OPTIONS = 
[:if, :unless, :on, :allow_nil, :allow_blank, :strict]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base) ⇒ BetterActiveModelErrors

Pass in the instance of the object that is using the errors object.

class Person
  def initialize
    @errors = ActiveModel::Errors.new(self)
  end
end



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# File 'lib/lev/better_active_model_errors.rb', line 80

def initialize(base)
  @base     = base
  @types = ActiveSupport::OrderedHash.new
  @messages = ActiveSupport::OrderedHash.new
end

Instance Attribute Details

#messages ⇒ Object (readonly)

Returns the value of attribute messages.



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# File 'lib/lev/better_active_model_errors.rb', line 70

def messages
  @messages
end

#types ⇒ Object (readonly)

Returns the value of attribute types.



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# File 'lib/lev/better_active_model_errors.rb', line 71

def types
  @types
end

Class Method Details

.full_message(model, attribute, message) ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 316

def self.full_message(model, attribute, message)
  return message if attribute == :base
  attr_name = attribute.to_s.gsub('.', '_').humanize
  attr_name = model.class.human_attribute_name(attribute, default: attr_name)
  I18n.t(:"errors.format", {
    default:   "%{attribute} %{message}",
    attribute: attr_name,
    message:   message
  })
end

.generate_message(model, attribute, type = :invalid, options = {}) ⇒ Object

TODO maybe don’t need this method split out any more?



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# File 'lib/lev/better_active_model_errors.rb', line 356

def self.generate_message(model, attribute, type = :invalid, options = {})
  type = options.delete(:message) if options[:message].is_a?(Symbol)
  attribute = attribute.to_sym
  if model.class.respond_to?(:i18n_scope)
    defaults = model.class.lookup_ancestors.map do |klass|
      [ :"#{model.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.attributes.#{attribute}.#{type}",
        :"#{model.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.#{type}" ]
    end
  else
    defaults = []
  end

  defaults << options.delete(:message)
  defaults << :"#{model.class.i18n_scope}.errors.messages.#{type}" if model.class.respond_to?(:i18n_scope)
  defaults << :"errors.attributes.#{attribute}.#{type}"
  defaults << :"errors.messages.#{type}"

  defaults.compact!
  defaults.flatten!

  key = defaults.shift
  value = (attribute != :base ? model.send(:read_attribute_for_validation, attribute) : nil)

  options = {
    :default => defaults,
    :model => model.class.model_name.human,
    :attribute => model.class.human_attribute_name(attribute),
    :value => value
  }.merge(options)

  I18n.translate(key, options)
end

Instance Method Details

#[](attribute) ⇒ Object

When passed a symbol or a name of a method, returns an array of errors for the method.

p.errors[:name]   # => ["can not be nil"]
p.errors['name']  # => ["can not be nil"]



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# File 'lib/lev/better_active_model_errors.rb', line 139

def [](attribute)
  get(attribute.to_sym) || set(attribute.to_sym, [])
end

#[]=(attribute, error) ⇒ Object

Adds to the supplied attribute the supplied error message.

p.errors[:name] = "must be set"
p.errors[:name] # => ['must be set']



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# File 'lib/lev/better_active_model_errors.rb', line 147

def []=(attribute, error)
  self[attribute] << error
end

#add(attribute, message = nil, options = {}) ⇒ Object

Adds message to the error messages on attribute. More than one error can be added to the same attribute. If no message is supplied, :invalid is assumed.

If message is a symbol, it will be translated using the appropriate scope (see translate_error). If message is a proc, it will be called, allowing for things like Time.now to be used within an error.



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# File 'lib/lev/better_active_model_errors.rb', line 258

def add(attribute, message = nil, options = {})
  normalized_message = normalize_message(attribute, message, options)
  if options[:strict]
    raise ActiveModel::StrictValidationFailed, full_message(attribute, normalized_message)
  end

  self[attribute] << normalized_message
  self.types[attribute.to_sym] << message.try(:to_sym)
end

#add_on_blank(attributes, options = {}) ⇒ Object

Will add an error message to each of the attributes in attributes that is blank (using Object#blank?).



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# File 'lib/lev/better_active_model_errors.rb', line 278

def add_on_blank(attributes, options = {})
  [attributes].flatten.each do |attribute|
    value = @base.send(:read_attribute_for_validation, attribute)
    add(attribute, :blank, options) if value.blank?
  end
end

#add_on_empty(attributes, options = {}) ⇒ Object

Will add an error message to each of the attributes in attributes that is empty.



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# File 'lib/lev/better_active_model_errors.rb', line 269

def add_on_empty(attributes, options = {})
  [attributes].flatten.each do |attribute|
    value = @base.send(:read_attribute_for_validation, attribute)
    is_empty = value.respond_to?(:empty?) ? value.empty? : false
    add(attribute, :empty, options) if value.nil? || is_empty
  end
end

#added?(attribute, message = nil, options = {}) ⇒ Boolean

Returns true if an error on the attribute with the given message is present, false otherwise. message is treated the same as for add.

p.errors.add :name, :blank
p.errors.added? :name, :blank # => true

Returns:

  • (Boolean) 


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# File 'lib/lev/better_active_model_errors.rb', line 289

def added?(attribute, message = nil, options = {})
  message = normalize_message(attribute, message, options)
  self[attribute].include? message
end

#as_json(options = nil) ⇒ Object

Returns an ActiveSupport::OrderedHash that can be used as the JSON representation for this object.



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# File 'lib/lev/better_active_model_errors.rb', line 240

def as_json(options=nil)
  to_hash
end

#clear ⇒ Object

Clear the messages



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# File 'lib/lev/better_active_model_errors.rb', line 101

def clear
  types.clear
  messages.clear
end

#count ⇒ Object

Returns the number of error messages.

p.errors.add(:name, "can't be blank")
p.errors.count # => 1
p.errors.add(:name, "must be specified")
p.errors.count # => 2



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# File 'lib/lev/better_active_model_errors.rb', line 213

def count
  to_a.size
end

#delete(key) ⇒ Object

Delete messages for key



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# File 'lib/lev/better_active_model_errors.rb', line 128

def delete(key)
  key = key.to_sym
  types.delete(key)
  messages.delete(key)
end

#dup ⇒ Object

:nodoc:



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# File 'lib/lev/better_active_model_errors.rb', line 93

def dup # :nodoc:
  copy = super
  copy.initialize_dup(self)
  copy
end

#each ⇒ Object

Iterates through each error key, value pair in the error messages hash. Yields the attribute and the error for that attribute. If the attribute has more than one error message, yields once for each error message.

p.errors.add(:name, "can't be blank")
p.errors.each do |attribute, errors_array|
  # Will yield :name and "can't be blank"
end

p.errors.add(:name, "must be specified")
p.errors.each do |attribute, errors_array|
  # Will yield :name and "can't be blank"
  # then yield :name and "must be specified"
end



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# File 'lib/lev/better_active_model_errors.rb', line 165

def each
  messages.each_key do |attribute|
    self[attribute].each { |error| yield attribute, error }
  end
end

#each_with_type_and_message ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 171

def each_with_type_and_message
  types.each_key do |attribute|
    for ii in 0..self.types[attribute].size-1
      yield attribute, self.types[attribute][ii], self.messages[attribute][ii]
    end
  end
end

#empty? ⇒ Boolean Also known as: blank?

Returns true if no errors are found, false otherwise. If the error message is a string it can be empty.

Returns:

  • (Boolean) 


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# File 'lib/lev/better_active_model_errors.rb', line 219

def empty?
  all? { |k, v| v && v.empty? && !v.is_a?(String) }
end

#full_message(attribute, message) ⇒ Object

Returns a full message for a given attribute.

company.errors.full_message(:name, "is invalid")  # =>
  "Name is invalid"



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# File 'lib/lev/better_active_model_errors.rb', line 312

def full_message(attribute, message)
  self.class.full_message(@base, attribute, message)
end

#full_messages ⇒ Object

Returns all the full error messages in an array.

class Company
  validates_presence_of :name, :address, :email
  validates_length_of :name, :in => 5..30
end

company = Company.create(:address => '123 First St.')
company.errors.full_messages # =>
  ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Email can't be blank"]



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# File 'lib/lev/better_active_model_errors.rb', line 304

def full_messages
  map { |attribute, message| full_message(attribute, message) }
end

#generate_message(attribute, type = :invalid, options = {}) ⇒ Object

Translates an error message in its default scope (activemodel.errors.messages).

Error messages are first looked up in models.MODEL.attributes.ATTRIBUTE.MESSAGE, if it’s not there, it’s looked up in models.MODEL.MESSAGE and if that is not there also, it returns the translation of the default message (e.g. activemodel.errors.messages.MESSAGE). The translated model name, translated attribute name and the value are available for interpolation.

When using inheritance in your models, it will check all the inherited models too, but only if the model itself hasn’t been found. Say you have class Admin < User; end and you wanted the translation for the :blank error message for the title attribute, it looks for these translations:

  • activemodel.errors.models.admin.attributes.title.blank

  • activemodel.errors.models.admin.blank

  • activemodel.errors.models.user.attributes.title.blank

  • activemodel.errors.models.user.blank

  • any default you provided through the options hash (in the activemodel.errors scope)

  • activemodel.errors.messages.blank

  • errors.attributes.title.blank

  • errors.messages.blank



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# File 'lib/lev/better_active_model_errors.rb', line 351

def generate_message(attribute, type = :invalid, options = {})
  self.class.generate_message(@base, attribute, type, options)
end

#get(key) ⇒ Object

Get messages for key



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# File 'lib/lev/better_active_model_errors.rb', line 113

def get(key)
  messages[key.to_sym]
end

#get_type(key) ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 117

def get_type(key)
  types[key.to_sym]
end

#include?(error) ⇒ Boolean Also known as: has_key?

Do the error messages include an error with key error?

Returns:

  • (Boolean) 


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# File 'lib/lev/better_active_model_errors.rb', line 107

def include?(error)
  (v = messages[error.to_sym]) && v.any?
end

#initialize_dup(other) ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 86

def initialize_dup(other)
  @types = other.types.dup
  @messages = other.messages.dup
end

#keys ⇒ Object

Returns all message keys



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# File 'lib/lev/better_active_model_errors.rb', line 195

def keys
  messages.keys
end

#set(key, value) ⇒ Object

Set messages for key to value



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# File 'lib/lev/better_active_model_errors.rb', line 122

def set(key, value)
  types[key.to_sym] = (value == [] ? [] : (value.is_a?(Symbol) ? value : nil))
  messages[key.to_sym] = value
end

#size ⇒ Object

Returns the number of error messages.

p.errors.add(:name, "can't be blank")
p.errors.size # => 1
p.errors.add(:name, "must be specified")
p.errors.size # => 2



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# File 'lib/lev/better_active_model_errors.rb', line 185

def size
  values.flatten.size
end

#to_a ⇒ Object

Returns an array of error messages, with the attribute name included

p.errors.add(:name, "can't be blank")
p.errors.add(:name, "must be specified")
p.errors.to_a # => ["name can't be blank", "name must be specified"]



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# File 'lib/lev/better_active_model_errors.rb', line 204

def to_a
  full_messages
end

#to_hash ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 244

def to_hash
  messages.dup
end

#to_s ⇒ Object 



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# File 'lib/lev/better_active_model_errors.rb', line 248

def to_s
  inspect
end

#to_xml(options = {}) ⇒ Object

Returns an xml formatted representation of the Errors hash.

p.errors.add(:name, "can't be blank")
p.errors.add(:name, "must be specified")
p.errors.to_xml
# =>
#  <?xml version=\"1.0\" encoding=\"UTF-8\"?>
#  <errors>
#    <error>name can't be blank</error>
#    <error>name must be specified</error>
#  </errors>



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# File 'lib/lev/better_active_model_errors.rb', line 235

def to_xml(options={})
  to_a.to_xml options.reverse_merge(:root => "errors", :skip_types => true)
end

#values ⇒ Object

Returns all message values



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# File 'lib/lev/better_active_model_errors.rb', line 190

def values
  messages.values
end