Module: Gutentag::ActiveRecord::InstanceMethods

Defined in:
lib/gutentag/active_record/instance_methods.rb,
lib/gutentag/active_record/instance_methods_3_2.rb,
lib/gutentag/active_record/instance_methods_4_2.rb

Overview

For Rails 4.2 only.

Constant Summary collapse

AR_VERSION = 
ActiveRecord::VERSION::STRING.to_f

Instance Method Summary collapse

Instance Method Details

#reset_tag_names ⇒ Object

The reason we overwrite the stored value is because new tags may be added to the instance directly (e.g. article.tags << tag), which invokes the save callbacks, but the old tag_names value is stored but not updated.



13
14
15
16
17
18
19
20
21
22
23
24
25
 
# File 'lib/gutentag/active_record/instance_methods.rb', line 13

def reset_tag_names
  # Rails 5.1 introduces major changes to how ActiveModel::Dirty works:
  # https://github.com/pat/gutentag/pull/70#issuecomment-524605448
  # For Rails <5.1 we'll use *_previously_changed?
  # and for 5.1+ we'll use saved_change_to_*?
  return if AR_VERSION < 5.1 && tag_names_previously_changed?
  return if AR_VERSION >= 5.1 && saved_change_to_tag_names?

  # Update the underlying value rather than going through the setter, to
  # ensure this update doesn't get marked as a 'change'.
  @attributes.write_from_database "tag_names", []
  @prepared_tag_names = false
end

#tag_names ⇒ Object 



27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
# File 'lib/gutentag/active_record/instance_methods.rb', line 27

def tag_names
  if super.nil? || !prepared_tag_names?
    # If the underlying value is nil, we've not requested this from the
    # database yet. But we also don't want to make the query twice. So, grab
    # the names, prepare as needed, and make sure we also invoke the setter.
    names = tags.pluck(:name)

    prepare_tag_names(names)
    self.tag_names = names
  end

  # Use ActiveRecord's underlying implementation with change tracking.
  super
end

#tag_names=(names) ⇒ Object 



42
43
44
45
46
47
48
 
# File 'lib/gutentag/active_record/instance_methods.rb', line 42

def tag_names=(names)
  # This value is about to be overwritten, but we want to make sure the change
  # tracking doesn't think the original value was nil.
  prepare_tag_names

  super Gutentag::TagNames.call(names)
end