Class: Card::Rule::PreferenceCache

Inherits:
Cache
  • Object
show all
Defined in:
lib/card/rule/preference_cache.rb

Overview

a preference is a user-specific rule. This caches all preferences in the deck

Constant Summary collapse

USER_ID_CACHE_KEY = 
"USER_IDS".freeze

Class Method Summary collapse

Methods inherited from Cache

read

Class Method Details

.clear ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 57

def clear
  super
  Card.cache.write USER_ID_CACHE_KEY, nil
end

.lookup_key(row) ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 68

def lookup_key row
  return unless (base = lookup_key_without_user row)

  "#{base}+#{row['user_id']}"
end

.lookup_key_without_user ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 66

alias_method :lookup_key_without_user, :lookup_key

.populate ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 37

def populate
  @rows = nil
  super.tap do
    populate_user_ids
    @rows = nil
  end
end

.populate_user_ids ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 45

def populate_user_ids
  Card.cache.write USER_ID_CACHE_KEY, user_id_hash
end

.rows ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 62

def rows
  @rows ||= super
end

.user_id_hash ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 49

def user_id_hash
  rows.each_with_object({}) do |row, hash|
    key = lookup_key_without_user row
    hash[key] ||= []
    hash[key] << row["user_id"]
  end
end

.user_ids ⇒ Object 



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# File 'lib/card/rule/preference_cache.rb', line 33

def user_ids
  Card.cache.read(USER_ID_CACHE_KEY) || (populate && user_ids)
end