Class: FlatMap::Errors

Inherits:
ActiveModel::Errors
  • Object
show all
Defined in:
lib/flat_map/errors.rb

Overview

Inherited from ActiveModel::Errors to slightly ease work when writing attributes in a way that can possibly result in an exception. If we’d want to add errors on that point and see them in the resulting object, we have to preserve them before owner’s run_validations! method call, since it will clear all the errors.

After validation complete, preserved errors are added to the list of the original ones.

Usecase scenario:

class MyMapper < FlatMap::Mapper
  def custom_attr=(value)
    raise MyException, 'cannot be foo' if value == 'foo'
  rescue MyException => e
    errors.preserve :custom_attr, e.message
  end
end

mapper = MyMapper.new(MyObject.new)
mapper.apply(:custom_attr => 'foo') # => false
mapper.errors[:custom_attr] # => ['cannot be foo']

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Errors

Add @preserved_errors to object.



26
27
28
29
 
# File 'lib/flat_map/errors.rb', line 26

def initialize(*)
  @preserved_errors = {}
  super
end

Instance Method Details

#add(attr, *args) ⇒ Object

Overridden to add suffixing support for mappings of mappers with name suffix



52
53
54
55
 
# File 'lib/flat_map/errors.rb', line 52

def add(attr, *args)
  attr = :"#{attr}_#{@base.suffix}" if attr != :base && @base.suffixed?
  super
end

#empty? ⇒ Boolean

Overloaded to add @preserved_errors to the list of original @messages. @preserved_errors are cleared after this method call.

Returns:

  • (Boolean) 


43
44
45
46
47
48
49
 
# File 'lib/flat_map/errors.rb', line 43

def empty?
  unless @preserved_errors.empty?
    @preserved_errors.each{ |key, value| add(key, value) }
    @preserved_errors.clear
  end
  super
end

#preserve(key, message) ⇒ Object

Postpone error. It will be added to @messages later, on empty? method call.

Parameters:

  • key (String, Symbol)
  • message (String) 


36
37
38
 
# File 'lib/flat_map/errors.rb', line 36

def preserve(key, message)
  @preserved_errors[key] = message
end