mongo-ruby-driver/lib/mongo/message/query_message.rb

68 lines
2.4 KiB
Ruby

require 'mongo/message/message'
require 'mongo/message/opcodes'
require 'mongo/util/ordered_hash'
module XGen
module Mongo
module Driver
class QueryMessage < Message
attr_reader :query
def initialize(db_name, collection_name, query)
super(OP_QUERY)
@query = query
write_int(0)
write_string("#{db_name}.#{collection_name}")
write_int(query.number_to_skip)
write_int(query.number_to_return)
sel = query.selector
if query.contains_special_fields
sel = OrderedHash.new
sel['query'] = query.selector
if query.order_by && query.order_by.length > 0
sel['orderby'] = case query.order_by
when String
{query.order_by => 1}
when Array
h = OrderedHash.new
query.order_by.each { |ob|
case ob
when String
h[ob] = 1
when Hash # should have one entry; will handle all
ob.each { |k,v| h[k] = v }
else
raise "illegal query order_by value #{query.order_by.inspect}"
end
}
h
when Hash # Should be an ordered hash, but this message doesn't care
query.order_by
else
raise "illegal order_by: is a #{query.order_by.class.name}, must be String, Array, Hash, or OrderedHash"
end
end
if query.hint_fields && query.hint_fields.length > 0
hints = OrderedHash.new
query.hint_fields.each { |hf| hints[hf] = 1 }
sel['$hint'] = hints
end
if query.explain
sel['$explain'] = true
end
end
write_doc(sel)
write_doc(query.fields) if query.fields
end
def first_key(key)
@first_key = key
end
end
end
end
end