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.



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

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.



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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 9

def reflection
  @reflection
end

#table ⇒ Object

Returns the value of attribute table.



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

def table
  @table
end

#tables ⇒ Object

Returns the value of attribute tables.



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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 9

def tables
  @tables
end

Instance Method Details

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



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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 24

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, children = nodes.children.partition do |node|
      !fetch_arel_attribute(node) { |attr| attr.relation.name == table.name }
    end
    nodes = table.create_and(children)

    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) 


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# 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