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

Inherits:
JoinPart
  • Object
show all
Defined in:
lib/store_base_sti_class_for_3_1.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#join_to(relation) ⇒ Object 



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# File 'lib/store_base_sti_class_for_3_1.rb', line 38

def join_to(relation)

  tables        = @tables.dup
  foreign_table = parent_table
  foreign_klass = parent.active_record

  # 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_with_index do |reflection, i|
    table = tables.shift

    case reflection.source_macro
    when :belongs_to
      key         = reflection.association_primary_key
      foreign_key = reflection.foreign_key
    when :has_and_belongs_to_many
      # Join the join table first...
      relation.from(join(
        table,
        table[reflection.foreign_key].
          eq(foreign_table[reflection.active_record_primary_key])
      ))

      foreign_table, table = table, tables.shift

      key         = reflection.association_primary_key
      foreign_key = reflection.association_foreign_key
    else
      key         = reflection.foreign_key
      foreign_key = reflection.active_record_primary_key
    end

    constraint = build_constraint(reflection, table, key, foreign_table, foreign_key)

    conditions = self.conditions[i].dup
    
    # START PATCH
    # original:
    # conditions << { reflection.type => foreign_klass.base_class.name } if reflection.type
    
    if ActiveRecord::Base.store_base_sti_class
      conditions << { reflection.type => foreign_klass.base_class.name } if reflection.type
    else
      conditions << { reflection.type => ([foreign_klass] + foreign_klass.descendants).map(&:name) } if reflection.type
    end
    
    # END PATCH

    unless conditions.empty?
      constraint = constraint.and(sanitize(conditions, table))
    end

    relation.from(join(table, constraint))

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

  relation
end