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
18
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 13

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

  @reflection = reflection
  @tables     = nil
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

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 



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
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 25

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

  # The chain starts with the target table, but we want to end with it here (makes
  # more sense in this context), so we reverse
  reflection.chain.reverse_each.with_index(1) do |reflection, i|
    table = tables[-i]
    klass = reflection.klass

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

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

    others = nodes.children.extract! do |node|
      !Arel.fetch_attribute(node) { |attr| attr.relation.name == table.name }
    end

    joins << table.create_join(table, table.create_on(nodes), join_type)

    unless others.empty?
      joins.concat arel.join_sources
      append_constraints(joins.last, others)
    end

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

  joins
end

#match?(other) ⇒ Boolean

Returns:

  • (Boolean) 


20
21
22
23
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 20

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

#readonly? ⇒ Boolean

Returns:

  • (Boolean) 


62
63
64
65
66
 
# File 'lib/active_record/associations/join_dependency/join_association.rb', line 62

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

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