Class: PaperTrailChanges

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

Constant Summary collapse

CHANGES_SINCE_VERSION_VALID_ARGS = 
[:version_id, :version_at, :model, :attributes]
CHANGES_HASH_VALID_ARGS = 
[:attributes, :version_hash, :model, :column_types]

Class Method Summary collapse

Class Method Details

.changes_hash(args) ⇒ Object 



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# File 'lib/paper_trail_changes.rb', line 58

def self.changes_hash(args)
  args.each do |key, val|
    raise "Invalid argument: '#{key}'." unless CHANGES_HASH_VALID_ARGS.include?(key)
  end
  
  attributes, version_hash, model, column_types = args[:attributes], args[:version_hash], args[:model], args[:column_types]
  changes_since = {}
  
  attributes.each do |key, val|
    key_s = key.to_s
    
    if match = key_s.match(/^(.+)_attributes$/)
      # Nested model. Since paper-trail doesn't keep track of this just pass it through.
      changes_since[key] = val
    elsif version_hash.key?(key_s)
      last_val = version_hash[key_s]
      changed = false
      type = column_types[key_s]
      
      if type == :string || type == :date || type == :text || type == :datetime
        changed = true if last_val.to_s != val.to_s
      elsif type == :integer
        changed = true if last_val.to_i != val.to_i
        changed = true if last_val == nil && val
      elsif type == :boolean
        if last_val == true
          bool_i = 1
        elsif last_val == false
          bool_i = 0
        elsif last_val.to_i == 1
          bool_i = 1
        elsif last_val.to_i == 0
          bool_i = 0
        end
        
        changed = true if bool_i != val.to_i
        changed = true if last_val == nil && val
      else
        raise "Unknown type: '#{type}'."
      end
      
      changes_since[key_s] = val if changed
    else
      changes_since[key_s] = val
    end
  end
  
  return changes_since
end

.changes_since_version(args) ⇒ Object 



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# File 'lib/paper_trail_changes.rb', line 10

def self.changes_since_version(args)
  args.each do |key, val|
    raise "Invalid argument: '#{key}'." unless CHANGES_SINCE_VERSION_VALID_ARGS.include?(key)
  end
  
  attributes, model = args[:attributes], args[:model]
  
  column_types = PaperTrailChanges.column_types_from_class(model.class)
  
  if args[:version_id]
    version_obj = Version.find(args[:version_id]) rescue nil
  elsif args[:version_at]
    version_model = model.version_at(args[:version_at])
  end
  
  version_model = model if version_obj.nil? && version_model.nil?
  
  if version_obj
    version_hash = Psych.load(version_obj.object).stringify_keys
  elsif version_model
    version_hash = {}
    version_model.attributes.each do |key, val|
      version_hash[key.to_s] = version_model.__send__("#{key}_before_type_cast")
    end
  else
    raise "Dont know what to do?"
  end
  
  changes_since = PaperTrailChanges.changes_hash(
    :attributes => attributes,
    :version_hash => version_hash,
    :model => model,
    :column_types => column_types
  )
  
  return changes_since
end

.column_types_from_class(class_obj) ⇒ Object 



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# File 'lib/paper_trail_changes.rb', line 48

def self.column_types_from_class(class_obj)
  column_types = {}
  class_obj.columns_hash.each do |name, col|
    column_types[name] = col.type
  end
  
  return column_types
end

.last_version(model) ⇒ Object 



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# File 'lib/paper_trail_changes.rb', line 4

def self.last_version(model)
  version = Version.where(:item_type => model.class.name, :item_id => model.id, :event => :update).order(:id).reverse_order.first
  return version
end