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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 = Base.send(:extract_options_from_args!, args)
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
def <<(*args)
raise ActiveRecord::ReadOnlyAssociation.new(@reflection)
end
[:push, :concat, :create, :build].each do |method|
alias_method method, :<<
end
# Calculate sum using SQL, not Enumerable
def sum(*args, &block)
calculate(:sum, *args, &block)
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.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]
)
@reflection.options[:uniq] ? records.to_set.to_a : records
end
def construct_conditions
conditions = if @reflection.through_reflection.options[:as]
"#{@reflection.through_reflection.table_name}.#{@reflection.through_reflection.options[:as]}_id = #{@owner.quoted_id} " +
"AND #{@reflection.through_reflection.table_name}.#{@reflection.through_reflection.options[:as]}_type = #{@owner.class.quote @owner.class.base_class.name.to_s}"
else
"#{@reflection.through_reflection.table_name}.#{@reflection.through_reflection.primary_key_name} = #{@owner.quoted_id}"
end
conditions << " AND (#{sql_conditions})" if sql_conditions
return conditions
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
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(@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
{
:find => { :from => construct_from, :conditions => construct_conditions, :joins => construct_joins, :select => construct_select },
:create => { @reflection.primary_key_name => @owner.id }
}
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 ||= [
(interpolate_sql(@reflection.active_record.send(:sanitize_sql, @reflection.options[:conditions])) if @reflection.options[:conditions]),
(interpolate_sql(@reflection.active_record.send(:sanitize_sql, @reflection.through_reflection.options[:conditions])) if @reflection.through_reflection.options[:conditions])
].compact.collect { |condition| "(#{condition})" }.join(' AND ') unless (!@reflection.options[:conditions] && !@reflection.through_reflection.options[:conditions])
end
alias_method :sql_conditions, :conditions
end
end
end
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