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Tag: v2.0.4
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module ActiveRecord
module Associations
class HasManyThroughAssociation < AssociationProxy #:nodoc:
def initialize(owner, reflection)
super
reflection.check_validity!
@finder_sql = construct_conditions
construct_sql
end
def find(*args)
options = args.extract_options!
conditions = "#{@finder_sql}"
if sanitized_conditions = sanitize_sql(options[:conditions])
conditions << " AND (#{sanitized_conditions})"
end
options[:conditions] = conditions
if options[:order] && @reflection.options[:order]
options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
elsif @reflection.options[:order]
options[:order] = @reflection.options[:order]
end
options[:select] = construct_select(options[:select])
options[:from] ||= construct_from
options[:joins] = construct_joins(options[:joins])
options[:include] = @reflection.source_reflection.options[:include] if options[:include].nil?
merge_options_from_reflection!(options)
# Pass through args exactly as we received them.
args << options
@reflection.klass.find(*args)
end
def reset
@target = []
@loaded = false
end
# Adds records to the association. The source record and its associates
# must have ids in order to create records associating them, so this
# will raise ActiveRecord::HasManyThroughCantAssociateNewRecords if
# either is a new record. Calls create! so you can rescue errors.
#
# The :before_add and :after_add callbacks are not yet supported.
def <<(*records)
return if records.empty?
through = @reflection.through_reflection
raise ActiveRecord::HasManyThroughCantAssociateNewRecords.new(@owner, through) if @owner.new_record?
klass = through.klass
klass.transaction do
flatten_deeper(records).each do |associate|
raise_on_type_mismatch(associate)
raise ActiveRecord::HasManyThroughCantAssociateNewRecords.new(@owner, through) unless associate.respond_to?(:new_record?) && !associate.new_record?
@owner.send(@reflection.through_reflection.name).proxy_target << klass.send(:with_scope, :create => construct_join_attributes(associate)) { klass.create! }
@target << associate if loaded?
end
end
self
end
[:push, :concat].each { |method| alias_method method, :<< }
# Removes +records+ from this association. Does not destroy +records+.
def delete(*records)
records = flatten_deeper(records)
records.each { |associate| raise_on_type_mismatch(associate) }
through = @reflection.through_reflection
raise ActiveRecord::HasManyThroughCantDissociateNewRecords.new(@owner, through) if @owner.new_record?
load_target
klass = through.klass
klass.transaction do
flatten_deeper(records).each do |associate|
raise_on_type_mismatch(associate)
raise ActiveRecord::HasManyThroughCantDissociateNewRecords.new(@owner, through) unless associate.respond_to?(:new_record?) && !associate.new_record?
@owner.send(through.name).proxy_target.delete(klass.delete_all(construct_join_attributes(associate)))
@target.delete(associate)
end
end
self
end
def build(attrs = nil)
raise ActiveRecord::HasManyThroughCantAssociateNewRecords.new(@owner, @reflection.through_reflection)
end
alias_method :new, :build
def create!(attrs = nil)
@reflection.klass.transaction do
self << (object = @reflection.klass.send(:with_scope, :create => attrs) { @reflection.klass.create! })
object
end
end
# Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn't been loaded and
# calling collection.size if it has. If it's more likely than not that the collection does have a size larger than zero
# and you need to fetch that collection afterwards, it'll take one less SELECT query if you use length.
def size
return @owner.send(:read_attribute, cached_counter_attribute_name) if has_cached_counter?
return @target.size if loaded?
return count
end
# Calculate sum using SQL, not Enumerable
def sum(*args, &block)
calculate(:sum, *args, &block)
end
def count(*args)
column_name, options = @reflection.klass.send(:construct_count_options_from_args, *args)
if @reflection.options[:uniq]
# This is needed because 'SELECT count(DISTINCT *)..' is not valid sql statement.
column_name = "#{@reflection.klass.table_name}.#{@reflection.klass.primary_key}" if column_name == :all
options.merge!(:distinct => true)
end
@reflection.klass.send(:with_scope, construct_scope) { @reflection.klass.count(column_name, options) }
end
protected
def method_missing(method, *args, &block)
if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
super
else
@reflection.klass.send(:with_scope, construct_scope) { @reflection.klass.send(method, *args, &block) }
end
end
def find_target
records = @reflection.klass.find(:all,
:select => construct_select,
:conditions => construct_conditions,
:from => construct_from,
:joins => construct_joins,
:order => @reflection.options[:order],
:limit => @reflection.options[:limit],
:group => @reflection.options[:group],
:include => @reflection.options[:include] || @reflection.source_reflection.options[:include]
)
records.uniq! if @reflection.options[:uniq]
records
end
# Construct attributes for associate pointing to owner.
def construct_owner_attributes(reflection)
if as = reflection.options[:as]
{ "#{as}_id" => @owner.id,
"#{as}_type" => @owner.class.base_class.name.to_s }
else
{ reflection.primary_key_name => @owner.id }
end
end
# Construct attributes for :through pointing to owner and associate.
def construct_join_attributes(associate)
join_attributes = construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id)
if @reflection.options[:source_type]
join_attributes.merge!(@reflection.source_reflection.options[:foreign_type] => associate.class.base_class.name.to_s)
end
join_attributes
end
# Associate attributes pointing to owner, quoted.
def construct_quoted_owner_attributes(reflection)
if as = reflection.options[:as]
{ "#{as}_id" => @owner.quoted_id,
"#{as}_type" => reflection.klass.quote_value(
@owner.class.base_class.name.to_s,
reflection.klass.columns_hash["#{as}_type"]) }
else
{ reflection.primary_key_name => @owner.quoted_id }
end
end
# Build SQL conditions from attributes, qualified by table name.
def construct_conditions
table_name = @reflection.through_reflection.table_name
conditions = construct_quoted_owner_attributes(@reflection.through_reflection).map do |attr, value|
"#{table_name}.#{attr} = #{value}"
end
conditions << sql_conditions if sql_conditions
"(" + conditions.join(') AND (') + ")"
end
def construct_from
@reflection.table_name
end
def construct_select(custom_select = nil)
selected = custom_select || @reflection.options[:select] || "#{@reflection.table_name}.*"
end
def construct_joins(custom_joins = nil)
polymorphic_join = nil
if @reflection.through_reflection.options[:as] || @reflection.source_reflection.macro == :belongs_to
reflection_primary_key = @reflection.klass.primary_key
source_primary_key = @reflection.source_reflection.primary_key_name
if @reflection.options[:source_type]
polymorphic_join = "AND %s.%s = %s" % [
@reflection.through_reflection.table_name, "#{@reflection.source_reflection.options[:foreign_type]}",
@owner.class.quote_value(@reflection.options[:source_type])
]
end
else
reflection_primary_key = @reflection.source_reflection.primary_key_name
source_primary_key = @reflection.klass.primary_key
if @reflection.source_reflection.options[:as]
polymorphic_join = "AND %s.%s = %s" % [
@reflection.table_name, "#{@reflection.source_reflection.options[:as]}_type",
@owner.class.quote_value(@reflection.through_reflection.klass.name)
]
end
end
"INNER JOIN %s ON %s.%s = %s.%s %s #{@reflection.options[:joins]} #{custom_joins}" % [
@reflection.through_reflection.table_name,
@reflection.table_name, reflection_primary_key,
@reflection.through_reflection.table_name, source_primary_key,
polymorphic_join
]
end
def construct_scope
{ :create => construct_owner_attributes(@reflection),
:find => { :from => construct_from,
:conditions => construct_conditions,
:joins => construct_joins,
:select => construct_select,
:order => @reflection.options[:order],
:limit => @reflection.options[:limit] } }
end
def construct_sql
case
when @reflection.options[:finder_sql]
@finder_sql = interpolate_sql(@reflection.options[:finder_sql])
@finder_sql = "#{@reflection.klass.table_name}.#{@reflection.primary_key_name} = #{@owner.quoted_id}"
@finder_sql << " AND (#{conditions})" if conditions
end
if @reflection.options[:counter_sql]
@counter_sql = interpolate_sql(@reflection.options[:counter_sql])
elsif @reflection.options[:finder_sql]
# replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
@reflection.options[:counter_sql] = @reflection.options[:finder_sql].sub(/SELECT (\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
@counter_sql = interpolate_sql(@reflection.options[:counter_sql])
else
@counter_sql = @finder_sql
end
end
def conditions
@conditions = build_conditions unless defined?(@conditions)
@conditions
end
def build_conditions
association_conditions = @reflection.options[:conditions]
through_conditions = @reflection.through_reflection.options[:conditions]
source_conditions = @reflection.source_reflection.options[:conditions]
uses_sti = !@reflection.through_reflection.klass.descends_from_active_record?
if association_conditions || through_conditions || source_conditions || uses_sti
all = []
[association_conditions, through_conditions, source_conditions].each do |conditions|
all << interpolate_sql(sanitize_sql(conditions)) if conditions
end
all << build_sti_condition if uses_sti
all.map { |sql| "(#{sql})" } * ' AND '
end
end
def build_sti_condition
"#{@reflection.through_reflection.table_name}.#{@reflection.through_reflection.klass.inheritance_column} = #{@reflection.klass.quote_value(@reflection.through_reflection.klass.name.demodulize)}"
end
alias_method :sql_conditions, :conditions
def has_cached_counter?
@owner.attribute_present?(cached_counter_attribute_name)
end
def cached_counter_attribute_name
"#{@reflection.name}_count"
end
end
end
end
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