Ruby on Rails latest stable (v4.2.1) - 0 notes - Superclass: 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 create block:

cache = StatementCache.create(Book.connection) do |params|
  Book.where(name: "my book").where("author_id > 3")

The cached statement is executed by using the execute method:

cache.execute([], Book, Book.connection)

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.

If you want to cache the statement without the values you can use the bind method of the block parameter.

cache = StatementCache.create(Book.connection) do |params|
  Book.where(name: params.bind)

And pass the bind values as the first argument of execute call.

cache.execute(["my book"], Book, Book.connection)
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