Class: Commendo::RedisBacked::TagSet

Inherits:
Object
  • Object
show all
Defined in:
lib/commendo/redis-backed/tag_set.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key_base) ⇒ TagSet

Returns a new instance of TagSet.



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# File 'lib/commendo/redis-backed/tag_set.rb', line 7

def initialize(key_base)
  @redis = Redis.new(host: Commendo.config.host, port: Commendo.config.port, db: Commendo.config.database)
  @key_base = key_base
end

Instance Attribute Details

#key_base ⇒ Object

Returns the value of attribute key_base.



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# File 'lib/commendo/redis-backed/tag_set.rb', line 5

def key_base
  @key_base
end

#redis ⇒ Object

Returns the value of attribute redis.



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# File 'lib/commendo/redis-backed/tag_set.rb', line 5

def redis
  @redis
end

Instance Method Details

#add(resource, *tags) ⇒ Object 



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# File 'lib/commendo/redis-backed/tag_set.rb', line 21

def add(resource, *tags)
  redis.sadd(resource_key(resource), tags) unless tags.empty?
end

#delete(resource, *tags) ⇒ Object 



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# File 'lib/commendo/redis-backed/tag_set.rb', line 37

def delete(resource, *tags)
  if tags.empty?
    redis.del(resource_key(resource))
  else
    redis.srem(resource_key(resource), tags)
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/commendo/redis-backed/tag_set.rb', line 12

def empty?
  cursor, keys = redis.scan(0, match: "#{key_base}:*", count: 1)
  cursor.to_i == 0 && keys.empty?
end

#get(resource) ⇒ Object 



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# File 'lib/commendo/redis-backed/tag_set.rb', line 17

def get(resource)
  redis.smembers(resource_key(resource)).sort
end

#matches(resource, include, exclude = []) ⇒ Object 



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# File 'lib/commendo/redis-backed/tag_set.rb', line 30

def matches(resource, include, exclude = [])
  resource_tags = get(resource)
  can_include = include.nil? || include.empty? || (resource_tags & include).length > 0
  should_exclude = !exclude.nil? && !exclude.empty? && (resource_tags & exclude).length > 0
  return can_include && !should_exclude
end

#set(resource, *tags) ⇒ Object 



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# File 'lib/commendo/redis-backed/tag_set.rb', line 25

def set(resource, *tags)
  delete(resource)
  add(resource, *tags)
end