module Gemmy::Patches::HashPatch::InstanceMethods::Persisted
Sets up a hash to mirror all changes to a database file All nested gets & sets require a list of keys, passed as subsequent args. Instead of [] and []=, use get and set
Everything in the db is contained in a hash with one predefined key, :data. The value is an empty, autovivified hash.
This also makes the caller hash autovivified
Example:
hash = {}.persisted(“db.yaml”) hash.set(:a, :b, 0) # => this writes to disk and memory hash.get(:a, :b) # => reads from memory hash.get(:a, :b, disk: true) # => reads from disk
Public Instance Methods
db()
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# File lib/gemmy/patches/hash_patch.rb, line 330 def db @store end
persisted(path)
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# File lib/gemmy/patches/hash_patch.rb, line 313 def persisted(path) require 'yaml/store' autovivified = Gemmy.patch("hash/i/autovivified")\ .method(:_autovivified) autovivified.call(self).tap do |hash| # load data from YAML into memory hash.instance_exec do @store = YAML::Store.new path @store.transaction do @store[:data] ||= autovivified.call({}) @store[:data].each { |k,v| self[k] = v.deep_dup } end end hash.extend Gemmy::Patches::HashPatch::PersistedHash end end