Class: ActiveRecord::Associations::JoinDependency::JoinAssociation

Inherits:
JoinPart
  • Object
show all
Defined in:
lib/active_record/associations/join_dependency/join_association.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Attributes inherited from JoinPart

#base_klass, #children

Instance Method Summary collapse

Methods inherited from JoinPart

#each, #each_children, #extract_record, #instantiate

Constructor Details

#initialize(reflection, children) ⇒ JoinAssociation

Returns a new instance of JoinAssociation.



13
14
15
16
17
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 13

def initialize(reflection, children)
  super(reflection.klass, children)

  @reflection = reflection
end

Instance Attribute Details

#reflection ⇒ Object (readonly)

Returns the value of attribute reflection.



10
11
12
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 10

def reflection
  @reflection
end

#table ⇒ Object

Returns the value of attribute table.



11
12
13
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 11

def table
  @table
end

#tables ⇒ Object (readonly)

Returns the value of attribute tables.



10
11
12
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 10

def tables
  @tables
end

Instance Method Details

#join_constraints(foreign_table, foreign_klass, join_type, alias_tracker) ⇒ Object 



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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 24

def join_constraints(foreign_table, foreign_klass, join_type, alias_tracker)
  joins = []
  chain = []

  reflection_chain = reflection.chain
  reflection_chain.each_with_index do |reflection, index|
    table, terminated = yield reflection, reflection_chain[index..]
    @table ||= table

    if terminated
      foreign_table, foreign_klass = table, reflection.klass
      break
    end

    chain << [reflection, table]
  end

  base_klass.with_connection do |connection|
    # The chain starts with the target table, but we want to end with it here (makes
    # more sense in this context), so we reverse
    chain.reverse_each do |reflection, table|
      klass = reflection.klass

      scope = reflection.join_scope(table, foreign_table, foreign_klass)

      unless scope.references_values.empty?
        associations = scope.eager_load_values | scope.includes_values

        unless associations.empty?
          scope.joins! scope.construct_join_dependency(associations, Arel::Nodes::OuterJoin)
        end
      end

      arel = scope.arel(alias_tracker.aliases)
      nodes = arel.constraints.first

      if nodes.is_a?(Arel::Nodes::And)
        others = nodes.children.extract! do |node|
          !Arel.fetch_attribute(node) { |attr| attr.relation.name == table.name }
        end
      end

      joins << join_type.new(table, Arel::Nodes::On.new(nodes))

      if others && !others.empty?
        joins.concat arel.join_sources
        append_constraints(connection, joins.last, others)
      end

      # The current table in this iteration becomes the foreign table in the next
      foreign_table, foreign_klass = table, klass
    end
  end

  joins
end

#match?(other) ⇒ Boolean

Returns:

  • (Boolean) 


19
20
21
22
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 19

def match?(other)
  return true if self == other
  super && reflection == other.reflection
end

#readonly? ⇒ Boolean

Returns:

  • (Boolean) 


81
82
83
84
85
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 81

def readonly?
  return @readonly if defined?(@readonly)

  @readonly = reflection.scope && reflection.scope_for(base_klass.unscoped).readonly_value
end

#strict_loading? ⇒ Boolean

Returns:

  • (Boolean) 


87
88
89
90
91
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 87

def strict_loading?
  return @strict_loading if defined?(@strict_loading)

  @strict_loading = reflection.scope && reflection.scope_for(base_klass.unscoped).strict_loading_value
end