Class: Lookback::Backends::Snapshot

Inherits:
Object
  • Object
show all
Defined in:
lib/lookback/backends.rb

Overview

In-memory snapshot backend. Stores an ordered list of versions per (record_class, record_id) key. Suitable for tests and single-process use; persistent stores land in later releases.

Defined Under Namespace

Classes: Version

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Snapshot

Returns a new instance of Snapshot.



13
14
15
 
# File 'lib/lookback/backends.rb', line 13

def initialize
  @versions = Hash.new { |h, k| h[k] = [] }
end

Instance Method Details

#clear ⇒ Object 



37
38
39
 
# File 'lib/lookback/backends.rb', line 37

def clear
  @versions.clear
end

#history(key) ⇒ Object 



29
30
31
 
# File 'lib/lookback/backends.rb', line 29

def history(key)
  @versions[key].dup
end

#latest(key) ⇒ Object 



33
34
35
 
# File 'lib/lookback/backends.rb', line 33

def latest(key)
  @versions[key].last
end

#record(key, attributes, event: :update, now: Time.now) ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/lookback/backends.rb', line 17

def record(key, attributes, event: :update, now: Time.now)
  list = @versions[key]
  version = Version.new(
    number: list.length + 1,
    recorded_at: now,
    attributes: deep_dup(attributes),
    event: event,
  )
  list << version
  version
end