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Contents
module MongoModel
class DynamicFinder
def initialize(scope, attribute_names, finder=:first, bang=false)
@scope, @attribute_names, @finder, @bang = scope, attribute_names, finder, bang
end
def execute(*args)
options = args.extract_options!
conditions = build_conditions(args)
result = @scope.where(conditions).send(instantiator? ? :first : @finder)
if result.nil?
if bang?
raise DocumentNotFound, "Couldn't find #{@scope.klass.to_s} with #{conditions.inspect}"
elsif instantiator?
return @scope.send(@finder, conditions)
end
end
result
end
def bang?
@bang
end
def instantiator?
@finder == :new || @finder == :create
end
def self.match(scope, method)
finder = :first
bang = false
case method.to_s
when /^find_(all_by|last_by|by)_([_a-zA-Z]\w*)$/
finder = :last if $1 == 'last_by'
finder = :all if $1 == 'all_by'
names = $2
when /^find_by_([_a-zA-Z]\w*)\!$/
bang = true
names = $1
when /^find_or_(initialize|create)_by_([_a-zA-Z]\w*)$/
finder = ($1 == 'initialize' ? :new : :create)
names = $2
else
return nil
end
names = names.split('_and_')
if names.all? { |n| scope.klass.properties.include?(n.to_sym) }
new(scope, names, finder, bang)
end
end
private
def build_conditions(args)
result = {}
@attribute_names.zip(args) do |attribute, value|
result[attribute.to_sym] = value
end
result
end
end
end
Version data entries
44 entries across 44 versions & 1 rubygems