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

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require 'mongo/message/message'
require 'mongo/message/opcodes'
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require 'mongo/util/ordered_hash'
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module XGen
module Mongo
module Driver
class QueryMessage < Message
attr_reader :query
def initialize(db_name, collection_name, query)
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super(OP_QUERY)
@query = query
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write_int(0)
write_string("#{db_name}.#{collection_name}")
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write_int(query.number_to_skip)
write_int(query.number_to_return)
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sel = query.selector
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if query.contains_special_fields
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sel = OrderedHash.new
sel['query'] = query.selector
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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
}
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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
sel['$hint'] = query.hint if query.hint && query.hint.length > 0
sel['$explain'] = true if query.explain
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end
write_doc(sel)
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write_doc(query.fields) if query.fields
end
def first_key(key)
@first_key = key
end
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end
end
end
end