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query.rb
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query.rb
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# encoding: UTF-8
require 'forwardable'
module Plucky
class Query
include Enumerable
extend Forwardable
OptionKeys = [
:select, :offset, :order, # MM
:fields, :skip, :limit, :sort, :hint, :snapshot, :batch_size, :timeout # Ruby Driver
]
attr_reader :criteria, :options, :collection
def_delegator :criteria, :simple?
def_delegator :options, :fields?
def_delegators :to_a, :each, :include?
def initialize(collection, opts={})
@collection, @options, @criteria = collection, OptionsHash.new, CriteriaHash.new
opts.each { |key, value| self[key] = value }
end
def initialize_copy(source)
super
@criteria = @criteria.dup
@options = @options.dup
end
def object_ids(*keys)
return criteria.object_ids if keys.empty?
criteria.object_ids = *keys
self
end
def per_page(limit=nil)
return @per_page || 25 if limit.nil?
@per_page = limit
self
end
def paginate(opts={})
page = opts.delete(:page)
limit = opts.delete(:per_page) || per_page
query = clone.update(opts)
total = query.count
paginator = Pagination::Paginator.new(total, page, limit)
query[:limit] = paginator.limit
query[:skip] = paginator.skip
query.all.tap do |docs|
docs.extend(Pagination::Decorator)
docs.paginator(paginator)
end
end
def find_each(opts={})
query = clone.update(opts)
query.collection.find(query.criteria.to_hash, query.options.to_hash)
end
def find_one(opts={})
query = clone.update(opts)
query.collection.find_one(query.criteria.to_hash, query.options.to_hash)
end
def find(*ids)
return nil if ids.empty?
if ids.size == 1 && !ids[0].is_a?(Array)
first(:_id => ids[0])
else
all(:_id => ids.flatten)
end
end
def all(opts={})
find_each(opts).to_a
end
def first(opts={})
find_one(opts)
end
def last(opts={})
clone.update(opts).reverse.find_one
end
def remove(opts={})
query = clone.update(opts)
query.collection.remove(query.criteria.to_hash)
end
def count(opts={})
find_each(opts).count
end
def size
count
end
def update(opts={})
opts.each { |key, value| self[key] = value }
self
end
def fields(*args)
clone.tap { |query| query.options[:fields] = args }
end
def limit(count=nil)
clone.tap { |query| query.options[:limit] = count }
end
def reverse
clone.tap do |query|
query[:sort].map! do |s|
[s[0], -s[1]]
end unless query.options[:sort].nil?
end
end
def skip(count=nil)
clone.tap { |query| query.options[:skip] = count }
end
def sort(*args)
clone.tap { |query| query.options[:sort] = *args }
end
def where(hash={})
clone.tap do |query|
query.criteria.merge!(CriteriaHash.new(hash))
end
end
def empty?
count.zero?
end
def exists?(options={})
!count(options).zero?
end
alias :exist? :exists?
def to_a
all
end
def [](key)
key = key.to_sym if key.respond_to?(:to_sym)
if OptionKeys.include?(key)
@options[key]
else
@criteria[key]
end
end
def []=(key, value)
key = key.to_sym if key.respond_to?(:to_sym)
if OptionKeys.include?(key)
@options[key] = value
else
@criteria[key] = value
end
end
def merge(other)
merged_criteria = criteria.merge(other.criteria).to_hash
merged_options = options.merge(other.options).to_hash
clone.update(merged_criteria).update(merged_options)
end
def to_hash
criteria.to_hash.merge(options.to_hash)
end
def inspect
as_nice_string = to_hash.collect do |key, value|
" #{key}: #{value.inspect}"
end.sort.join(",")
"#<#{self.class}#{as_nice_string}>"
end
end
end