79 lines
2.9 KiB
Ruby
79 lines
2.9 KiB
Ruby
# --
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# Copyright (C) 2008 10gen Inc.
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License, version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
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# for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ++
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require 'socket'
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require 'mongo/collection'
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require 'mongo/message'
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module XGen
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module Mongo
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module Driver
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# A query against a collection. A query's selector is a hash. See the
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# Mongo documentation for query details.
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class Query
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attr_accessor :number_to_skip, :number_to_return, :order_by
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attr_reader :selector, :fields # writers defined below
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# sel :: A hash describing the query. See the Mongo docs for details.
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#
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# return_fields :: If not +nil+, an array of field names. Only those
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# fields will be returned. (Called :fields in calls
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# to Collection#find.)
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#
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# number_to_skip :: Number of records to skip before returning
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# records. (Called :offset in calls to
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# Collection#find.)
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#
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# number_to_return :: Max number of records to return. (Called :limit
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# in calls to Collection#find.)
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#
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# order_by :: If not +nil+, specifies record return order. Either hash
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# of field names as keys and 1/-1 as values; 1 ==
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# ascending, -1 == descending, or array of field names
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# (all assumed to be sorted in ascending order). (Called
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# :sort in calls to Collection#find.)
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def initialize(sel={}, return_fields=nil, number_to_skip=0, number_to_return=0, order_by=nil)
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@number_to_skip, @number_to_return, @order_by = number_to_skip, number_to_return, order_by
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self.selector = sel
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self.fields = return_fields
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end
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# Set query selector hash. If sel is a string, it will be used as a
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# $where clause. (See Mongo docs for details.)
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def selector=(sel)
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@selector = case sel
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when nil
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{}
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when String
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{"$where" => sel}
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when Hash
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sel
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end
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end
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# Set fields to return. If +val+ is +nil+ or empty, all fields will be
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# returned.
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def fields=(val)
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@fields = val
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@fields = nil if @fields && @fields.empty?
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end
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end
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end
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end
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end
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