Class: ActiveRecord::Associations::AssociationScope

Inherits:
Object
  • Object
show all
Defined in:
lib/conjoin/active_record.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#add_constraints(scope) ⇒ Object 



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# File 'lib/conjoin/active_record.rb', line 281

def add_constraints(scope)
  tables = construct_tables

  chain.each_with_index do |reflection, i|
    table, foreign_table = tables.shift, tables.first

    if reflection.source_macro == :has_and_belongs_to_many
      join_table = tables.shift

      scope = scope.joins(join(
        join_table,
        table[reflection.association_primary_key].
          eq(join_table[reflection.association_foreign_key])
      ))

      table, foreign_table = join_table, tables.first
    end

    if reflection.source_macro == :belongs_to
      if reflection.options[:polymorphic]
        key = reflection.association_primary_key(self.klass)
      else
        key = reflection.association_primary_key
      end

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

    if reflection == chain.last
      bind_val = bind scope, table.table_name, key.to_s, owner[foreign_key]
      scope    = scope.where(table[key].eq(bind_val))

      if reflection.type
        #############################################
        #############################################
        #############################################
        #############################################
        #############################################
        #############################################
        # .gsub(/\w+::/, '')
        # is a fix for polymorphic associations like
        # VendorWizard::VendorGroup so it can work
        # with the _type VendorGroup instead of
        # VendorWizard::VendorGroup
        #############################################
        #############################################
        #############################################
        #############################################
        #############################################
        value    = owner.class.base_class.name.gsub(/\w+::/, '')
        #############################################
        bind_val = bind scope, table.table_name, reflection.type.to_s, value
        scope    = scope.where(table[reflection.type].eq(bind_val))
      end

    else
      constraint = table[key].eq(foreign_table[foreign_key])

      if reflection.type
        type = chain[i + 1].klass.base_class.name
        constraint = constraint.and(table[reflection.type].eq(type))
      end

      scope = scope.joins(join(foreign_table, constraint))
    end

    is_first_chain = i == 0
    klass = is_first_chain ? self.klass : reflection.klass

    # Exclude the scope of the association itself, because that
    # was already merged in the #scope method.
    scope_chain[i].each do |scope_chain_item|
      item  = eval_scope(klass, scope_chain_item)

      if scope_chain_item == self.reflection.scope
        scope.merge! item.except(:where, :includes)
      end

      if is_first_chain
        scope.includes! item.includes_values
      end

      scope.where_values += item.where_values
      scope.order_values |= item.order_values
    end
  end

  scope
end