Class: ActiveRecord::Errors

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/errors.rb

Instance Method Summary collapse

Instance Method Details

#merge(errors, options = {}) ⇒ Object

Merges the errors from the passed in errors object onto this errors object.

Examples

class Person < ActiveRecord::Base
  validates_presence_of :name
end

class Address < ActiveRecord::Base
  validates_presence_of :street, :city, :state, :zip
end

joe = Person.new
joe.valid? # => false

address = Address.new
address.valid? # => false

joe.errors.merge address.errors
joe.errors.on(:name) # => "can't be blank"
joe.errors.on(:street) # => "can't be blank"
joe.errors.on(:city) # => "can't be blank"
joe.errors.on(:state) # => "can't be blank"
joe.errors.on(:zip) # => "can't be blank"

Options

* +only+ - can take a single field or an array of fields, it merges errors from the specified fields
* +except+ - can take a single field or an array of fields, it merges all errors except the on the fields specified



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# File 'lib/active_record/errors.rb', line 35

def merge(errors, options={})
  fields_to_merge = if only=options[:only]
    only
  elsif except=options[:except]
    except = [except] unless except.is_a?(Array)
    except.map!(&:to_sym)
    errors.entries.map(&:first).select do |field|
      !except.include?(field.to_sym)
    end
  else
    errors.entries.map(&:first)
  end
  fields_to_merge = [fields_to_merge] unless fields_to_merge.is_a?(Array)
  fields_to_merge.map!(&:to_sym)

  errors.entries.each do |field, msg|
    add field, msg if fields_to_merge.include?(field.to_sym)
  end
end