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module Merit
# 5 stars is a common ranking use case. They are not given at specified
# actions like badges, you should define a cron job to test if ranks are to
# be granted.
#
# +set_rank+ accepts:
# * :+level+ ranking level (greater is better)
# * :+to+ model or scope to check if new rankings apply
# * :+level_name+ attribute name (default is empty and results in 'level'
# attribute, if set it's appended like 'level_#{level_name}')
module RankRulesMethods
# Populates +defined_rules+ hash with following hierarchy:
# defined_rules[ModelToRank] = { levels => blocks }
def set_rank(*args, &block)
options = args.extract_options!
rule = Rule.new
rule.block = block
if options[:level_name].present?
rule.level_name = "level_#{options[:level_name]}"
else
rule.level_name = 'level'
end
defined_rules[options[:to]] ||= {}
defined_rules[options[:to]].merge!(options[:level] => rule)
end
# Not part of merit after_filter. To be called asynchronously:
# Merit::RankRules.new.check_rank_rules
def check_rank_rules
defined_rules.each do |scoped_model, level_and_rules|
level_and_rules.sort.each do |level, rule|
grant_when_applies(scoped_model, rule, level)
end
end
end
# Currently defined rules
def defined_rules
@defined_rules ||= {}
end
private
def grant_when_applies(scoped_model, rule, level)
scoped_model.where("#{rule.level_name} < #{level}").each do |object|
next unless rule.applies?(object)
object.update_attribute rule.level_name, level
end
rescue ActiveRecord::StatementInvalid
str = "Error while granting rankings. Probably you need to add
#{rule.level_name} column to #{scoped_model.class.name}."
raise RankAttributeNotDefined, str
end
end
end
Version data entries
19 entries across 19 versions & 2 rubygems