Class: ActiveRecord::Associations::Preloader::Association

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

Instance Method Summary collapse

Instance Method Details

#associated_records_by_owner ⇒ Object 



12
13
14
15
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
 
# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 12

def associated_records_by_owner
  # CPK
  owners_map = owners_by_key
  #owner_keys = owners_map.keys.compact
  owner_keys = owners.map do |owner|
    Array(owner_key_name).map do |owner_key|
      owner[owner_key]
    end
  end.compact.uniq

  if klass.nil? || owner_keys.empty?
    records = []
  else
    # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000)
    # Make several smaller queries if necessary or make one query if the adapter supports it
    sliced  = owner_keys.each_slice(model.connection.in_clause_length || owner_keys.size)
    records = sliced.map { |slice| records_for(slice) }.flatten
  end

  # Each record may have multiple owners, and vice-versa
  records_by_owner = Hash[owners.map { |owner| [owner, []] }]
  records.each do |record|
    # CPK
    # owner_key = record[association_key_name].to_s
    owner_key = Array(association_key_name).map do |key_name|
      record[key_name]
    end.join(CompositePrimaryKeys::ID_SEP)

    owners_map[owner_key].each do |owner|
      records_by_owner[owner] << record
    end
  end
  records_by_owner
end

#owners_by_key ⇒ Object 



47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 47

def owners_by_key
  @owners_by_key ||= owners.group_by do |owner|
    # CPK
    # key = owner[owner_key_name]
    key = Array(owner_key_name).map do |key_name|
      owner[key_name]
    end
    # CPK
    # key && key.to_s
    key && key.join(CompositePrimaryKeys::ID_SEP)
  end
end

#records_for(ids) ⇒ Object 



5
6
7
8
9
10
 
# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 5

def records_for(ids)
  # CPK
  # scoped.where(association_key.in(ids))
  predicate = cpk_in_predicate(table, reflection.foreign_key, ids)
  scoped.where(predicate)
end