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class ActiveRecord::StatementCache

Parent:: Object

Statement cache is used to cache a single statement in order to avoid creating the AST again. Initializing the cache is done by passing the statement in the initialization block:

cache = ActiveRecord::StatementCache.new do
  Book.where(name: "my book").limit(100)
end

The cached statement is executed by using the execute method:

cache.execute

The relation returned by the block is cached, and for each execute call the cached relation gets duped. Database is queried when to_a is called on the relation.

Public Class Methods

new() { || ... } Show source

# File activerecord/lib/active_record/statement_cache.rb, line 17
def initialize
  @relation = yield
  raise ArgumentError.new("Statement cannot be nil") if @relation.nil?
end

Public Instance Methods

execute() Show source

# File activerecord/lib/active_record/statement_cache.rb, line 22
def execute
  @relation.dup.to_a
end