Class: SmartCollection::CacheManager

Inherits:
Object
  • Object
show all
Defined in:
lib/smart_collection/cache_manager.rb

Instance Method Summary collapse

Constructor Details

#initialize(model:, config:) ⇒ CacheManager

Returns a new instance of CacheManager.



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# File 'lib/smart_collection/cache_manager.rb', line 3

def initialize model:, config:
  @model = model
  @config = config
  define_cache_association_for model
end

Instance Method Details

#cache_exists?(owner) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smart_collection/cache_manager.rb', line 41

def cache_exists? owner
  owner.cache_expires_at && owner.cache_expires_at > Time.now
end

#define_cache_association_for(model) ⇒ Object 



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# File 'lib/smart_collection/cache_manager.rb', line 9

def define_cache_association_for model
  config = @config
  cached_item_model = nil
  model.class_eval do
    cached_item_model = Class.new ActiveRecord::Base do
      self.table_name = config.cache_table_name
      belongs_to config.item_name, class_name: config.item_class_name, foreign_key: :item_id
    end
    const_set("CachedItem", cached_item_model)

    has_many :cached_items, class_name: cached_item_model.name, foreign_key: :collection_id
    has_many "cached_#{config.items_name}".to_sym, class_name: config.item_class_name, through: :cached_items, source: config.item_name
  end
  @cache_model = cached_item_model
end

#read_scope(owner) ⇒ Object 



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# File 'lib/smart_collection/cache_manager.rb', line 36

def read_scope owner
  cache_association = owner.association("cached_#{@config.items_name}")
  cache_association.scope
end

#update(owner) ⇒ Object 



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# File 'lib/smart_collection/cache_manager.rb', line 25

def update owner
  scopes = @config.scopes_proc.(owner)
  @cache_model.where(collection_id: owner.id).delete_all
  #scopes.each do |scope|
  #  sql = scope.select(owner.id, :id).to_sql
  #  @cache_model.connection.execute "INSERT INTO #{@cache_model.table_name} (collection_id, item_id) #{sql}"
  #end
  @cache_model.connection.execute "INSERT INTO #{@cache_model.table_name} (collection_id, item_id) #{owner.smart_collection_mixin.uncached_scope(owner).select(owner.id, :id).to_sql}"
  owner.update_column(:cache_expires_at, Time.now + @config.cache_expires_in_proc.(owner))
end