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# File 'lib/zermelo/filters/steps/set_step.rb', line 16
def resolve(backend, associated_class, opts = {})
case backend
when Zermelo::Backends::Redis
initial_key = opts[:initial_key]
source = opts[:source]
idx_attrs = opts[:index_attrs]
attr_types = opts[:attr_types]
temp_keys = opts[:temp_keys]
order = opts[:sort_order]
source_keys = @attributes.each_with_object([]) do |(att, value), memo|
idx_class = nil
unless :id.eql?(att)
idx_class = idx_attrs[att.to_s]
raise "'#{att}' property is not indexed" if idx_class.nil?
end
if [Set, Array].any? {|t| value.is_a?(t) }
conditions_set = associated_class.send(:temp_key, source.type)
temp_keys << conditions_set
r_conditions_set = backend.key_to_redis_key(conditions_set)
backend.temp_key_wrap do |conditions_temp_keys|
if idx_class.nil?
cond_objects, cond_ids = value.partition do |v|
[Zermelo::Filter, Zermelo::Associations::Multiple].any? {|c| v.is_a?(c)}
end
unless cond_objects.empty?
cond_keys = cond_objects.collect do |co|
k = case co
when Zermelo::Filter
co.send(:resolve_steps)
when Zermelo::Associations::Multiple
co.instance_variable_get('@record_ids_key')
end
backend.key_to_redis_key(k)
end
Zermelo.redis.sunionstore(r_conditions_set, *cond_keys)
end
unless cond_ids.empty?
cond_ids.map! {|ci| ci.is_a?(Zermelo::Associations::Singular) ? ci.id : ci }
Zermelo.redis.sadd(r_conditions_set, cond_ids)
end
else
index_keys = value.to_a.collect {|v|
il = backend.index_lookup(att, associated_class,
idx_class, v, attr_types[att], conditions_temp_keys)
backend.key_to_redis_key(il)
}
case source.type
when :set
Zermelo.redis.sunionstore(r_conditions_set, *index_keys)
when :sorted_set
Zermelo.redis.zunionstore(r_conditions_set, index_keys)
end
end
end
memo << conditions_set
elsif idx_class.nil?
case value
when Zermelo::Filter
ts = value.send(:resolve_steps)
temp_keys << ts
memo << ts
when Zermelo::Associations::Multiple
memo << value.instance_variable_get('@record_ids_key')
else
ts = associated_class.send(:temp_key, :set)
temp_keys << ts
r_ts = backend.key_to_redis_key(ts)
Zermelo.redis.sadd(r_ts,
value.is_a?(Zermelo::Associations::Singular) ? value.id : value)
memo << ts
end
else
memo << backend.index_lookup(att, associated_class,
idx_class, value, attr_types[att], temp_keys)
end
end
r_source_key = backend.key_to_redis_key(source)
r_source_keys = source_keys.collect {|sk| backend.key_to_redis_key(sk) }
op = @options[:op]
shortcut = opts[:shortcut]
if :ids.eql?(shortcut) && (source.type == :set)
case op
when :union
backend.temp_key_wrap do |shortcut_temp_keys|
dest_set = associated_class.send(:temp_key, :set)
shortcut_temp_keys << dest_set
r_dest_set = backend.key_to_redis_key(dest_set)
Zermelo.redis.sinterstore(r_dest_set, *r_source_keys)
Set.new(Zermelo.redis.sunion(r_source_key, r_dest_set))
end
when :intersect
Set.new(Zermelo.redis.sinter(r_source_key, *r_source_keys))
when :diff
backend.temp_key_wrap do |shortcut_temp_keys|
dest_set = associated_class.send(:temp_key, :set)
shortcut_temp_keys << dest_set
r_dest_set = backend.key_to_redis_key(dest_set)
Zermelo.redis.sinterstore(r_dest_set, *r_source_keys)
Set.new(Zermelo.redis.sdiff(r_source_key, r_dest_set))
end
end
else
dest_set = associated_class.send(:temp_key, source.type)
r_dest_set = backend.key_to_redis_key(dest_set)
temp_keys << dest_set
case op
when :union
r_initial_key = backend.key_to_redis_key(initial_key)
if source.type == :sorted_set
Zermelo.redis.zinterstore(r_dest_set,
[r_initial_key] + r_source_keys,
:weights => [1.0] + ([0.0] * source_keys.length), :aggregate => 'max')
Zermelo.redis.zunionstore(r_dest_set, [r_source_key, r_dest_set], :aggregate => 'max')
else
Zermelo.redis.sinterstore(r_dest_set, r_initial_key, *r_source_keys)
Zermelo.redis.sunionstore(r_dest_set, r_dest_set, r_source_key)
end
when :intersect
if source.type == :sorted_set
Zermelo.redis.zinterstore(r_dest_set, [r_source_key] + r_source_keys, :aggregate => 'max')
else
Zermelo.redis.sinterstore(r_dest_set, r_source_key, *r_source_keys)
end
when :diff
if source.type == :sorted_set
Zermelo.redis.zinterstore(r_dest_set, r_source_keys, :aggregate => 'max')
Zermelo.redis.zunionstore(r_dest_set, [r_source_key, r_dest_set], :weights => [1.0, 0.0], :aggregate => 'min')
Zermelo.redis.zremrangebyscore(r_dest_set, "0", "0")
else
Zermelo.redis.sinterstore(r_dest_set, *r_source_keys)
Zermelo.redis.sdiffstore(r_dest_set, r_dest_set, r_source_key)
end
end
return dest_set if shortcut.nil?
shortcut_params = case source.type
when :sorted_set
[r_dest_set, order] + opts[:shortcut_args]
else
[r_dest_set] + opts[:shortcut_args]
end
Zermelo::Filters::Redis::SHORTCUTS[source.type][shortcut].
call(*shortcut_params)
end
when Zermelo::Backends::InfluxDB
query = ''
attr_types = opts[:attr_types]
unless opts[:first].is_a?(TrueClass)
case @options[:op]
when :intersect, :diff
query += ' AND '
when :union
query += ' OR '
end
end
case @options[:op]
when :intersect, :union
query += @attributes.collect {|k, v|
attr_type = attr_types[k]
if v.is_a?(Enumerable)
qq = v.each_with_object([]) do |vv, memo|
ov = case vv
when Regexp
raise "Can't query non-string values via regexp" unless :string.eql?(attr_type)
"=~ /#{vv.source.gsub(/\\\\/, "\\")}/"
when String
"=~ /^#{Regexp.escape(vv).gsub(/\\\\/, "\\")}$/"
else
"= '#{vv}'"
end
memo << "#{k} #{ov}"
end
"((#{qq.join(') OR (')}))"
else
op_value = case v
when Regexp
raise "Can't query non-string values via regexp" unless :string.eql?(attr_type)
"=~ /#{v.source.gsub(/\\\\/, "\\")}/"
when String
"=~ /^#{Regexp.escape(v).gsub(/\\\\/, "\\")}$/"
else
"= '#{v}'"
end
"(#{k} #{op_value})"
end
}.join(' AND ')
when :diff
query += @attributes.collect {|k, v|
if v.is_a?(Enumerable)
qq = v.each_with_object([]) do |vv, memo|
ov = case vv
when Regexp
raise "Can't query non-string values via regexp" unless :string.eql?(attr_type)
"!~ /#{vv.source.gsub(/\\\\/, "\\")}/"
when String
"!~ /^#{Regexp.escape(vv).gsub(/\\\\/, "\\")}$/"
else
"<> '#{vv}'"
end
memo << "#{k} #{ov}"
end
"((#{qq.join(') OR (')}))"
else
op_value = case v
when Regexp
raise "Can't query non-string values via regexp" unless :string.eql?(attr_type)
"!~ /#{v.source.gsub(/\\\\/, "\\")}/"
when String
"!~ /^#{Regexp.escape(v).gsub(/\\\\/, "\\")}$/"
else
"<> '#{v}'"
end
"(#{k} #{op_value})"
end
}.join(' AND ')
else
raise "Unhandled filter operation '#{@options[:op]}'"
end
query += ")"
query
end
end
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