Class: ActiveRecord::DeleteRestrictionError

Inherits:
ActiveRecordError
  • Object
show all
Defined in:
lib/dependent_protect/delete_restriction_error.rb

Overview

This error is raised when trying to destroy a parent instance in N:1 or 1:1 associations (has_many, has_one) when there is at least 1 child associated instance. ex: if @project.tasks.size > 0, DeleteRestrictionError will be raised when trying to destroy @project

Instance Method Summary collapse

Constructor Details

#initialize(reflection, record) ⇒ DeleteRestrictionError

:nodoc:



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# File 'lib/dependent_protect/delete_restriction_error.rb', line 6

def initialize(reflection, record)
  @reflection = reflection
  @record = record
  super(basic_message)
end

Instance Method Details

#basic_message ⇒ Object 



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# File 'lib/dependent_protect/delete_restriction_error.rb', line 12

def basic_message
  single = @reflection.class_name.to_s.underscore.gsub('_', ' ')
  if [:has_many, :has_and_belongs_to_many].include?(@reflection.macro)
    count = @record.send(@reflection.name).count
    type = count == 1 ? single : single.pluralize
    exist = (count == 1 ? 'exists' : 'exist')
    "Cannot delete record because #{count} dependent #{type} #{exist}"
  else
    "Cannot delete record because dependent #{single} exists"
  end
end

#detailed_message ⇒ Object 



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# File 'lib/dependent_protect/delete_restriction_error.rb', line 24

def detailed_message
  count = @record.send(@reflection.name).count
  examples = @record.send(@reflection.name).all(:limit => 5).map{|o| "#{o.id}: #{o.to_s}"}
  examples[4] = "...and #{count - 4} more" if count > 5
  basic_message + "\n\n\nThese include:\n#{examples.join("\n")}"
end