Created
July 26, 2010 14:47
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# First rule of pasting code, add comments to explain logic and data structres | |
# when it's non-obvious in the code. (Pretty much always) | |
class MongoMapperDocument | |
# Searches for documents | |
# | |
# Structure for `criteria` | |
# [ | |
# { | |
# "field" => "comments_count" | |
# "operator" => "gte" #or nil | |
# "value" => "4" | |
# }, | |
# ] | |
def self.search(criteria, options={}) | |
valid_operators = %w(gt lt gte lte ne in nin mod all exists asc desc) #valid for plucky in ruby 1.9, see plucky source | |
#protect against invalid operators being called. | |
criteria.each do |h| | |
unless h["operator"].nil? || valid_operators.include?(h["operator"]) | |
h["operator"] = nil | |
end | |
end | |
new_query = where(options) #allow limits and stuff to be set using `options` | |
criteria.each do |h| | |
#expanded code to make it easier to follow | |
field = h["field"].to_sym | |
operator = h["operator"].nil? nil : h["operator"].to_sym | |
value = h["value"] | |
field = field.send(operator) if operator | |
#building query, not executed yet. | |
new_query = new_query.where(field => value) | |
end | |
return new_query # we return the query, the database has not been hit at this point. | |
# The object returns acts like an array. It will load data from the database when it's needed to populate the array. | |
end | |
end |
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Beware of bugs in the code. I have neither proofed or tested it. ;)