Class: ActiveRecord::Associations::HasManyThroughAssociation

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/associations/has_many_through_association.rb

Instance Method Summary collapse

Instance Method Details

#cpk_join_through_predicate(*records) ⇒ Object 



4
5
6
7
8
9
10
11
12
13
14
 
# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 4

def cpk_join_through_predicate(*records)
  ensure_mutable

  ids = records.map do |record|
    source_reflection.association_primary_key(reflection.klass).map do |key|
      record.send(key)
    end
  end

  cpk_in_predicate(through_association.scope.klass.arel_table, source_reflection.foreign_key, ids)
end

#delete_records(records, method) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 16

def delete_records(records, method)
  ensure_not_nested

  scope = through_association.scope
  # CPK
  # scope.where! construct_join_attributes(*records)
  if source_reflection.klass.composite?
    scope.where! cpk_join_through_predicate(*records)
  else
    scope.where! construct_join_attributes(*records)
  end

  case method
  when :destroy
    if scope.klass.primary_key
      count = scope.destroy_all.length
    else
      scope.to_a.each do |record|
        record.run_callbacks :destroy
      end

      arel = scope.arel

      stmt = Arel::DeleteManager.new arel.engine
      stmt.from scope.klass.arel_table
      stmt.wheres = arel.constraints

      count = scope.klass.connection.delete(stmt, 'SQL', scope.bind_values)
    end
  when :nullify
    count = scope.update_all(source_reflection.foreign_key => nil)
  else
    count = scope.delete_all
  end

  delete_through_records(records)

  if source_reflection.options[:counter_cache] && method != :destroy
    counter = source_reflection.counter_cache_column
    klass.decrement_counter counter, records.map(&:id)
  end

  if through_reflection.collection? && update_through_counter?(method)
    update_counter(-count, through_reflection)
  end

  update_counter(-count)
end

#through_records_for(record) ⇒ Object 



65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
 
# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 65

def through_records_for(record)
  # CPK
  # attributes = construct_join_attributes(record)
  # candidates = Array.wrap(through_association.target)
  # candidates.find_all do |c|
  #   attributes.all? do |key, value|
  #     c.public_send(key) == value
  #   end
  # end
  if record.composite?
    candidates = Array.wrap(through_association.target)
    candidates.find_all { |c| c.attributes.slice(*source_reflection.association_primary_key) == record.ids_hash }
  else
    attributes = construct_join_attributes(record)
    candidates = Array.wrap(through_association.target)
    candidates.find_all do |c|
      attributes.all? do |key, value|
        c.public_send(key) == value
      end
    end
  end
end