Class: FrozenRecord::Index

Inherits:
Object
  • Object
show all
Defined in:
lib/frozen_record/index.rb

Direct Known Subclasses

UniqueIndex

Constant Summary collapse

AttributeNonUnique = 
Class.new(StandardError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, attribute, unique: false) ⇒ Index

Returns a new instance of Index.



12
13
14
15
16
 
# File 'lib/frozen_record/index.rb', line 12

def initialize(model, attribute, unique: false)
  @model = model
  @attribute = -attribute.to_s
  @index = nil
end

Instance Attribute Details

#attribute ⇒ Object (readonly)

Returns the value of attribute attribute.



10
11
12
 
# File 'lib/frozen_record/index.rb', line 10

def attribute
  @attribute
end

#model ⇒ Object (readonly)

Returns the value of attribute model.



10
11
12
 
# File 'lib/frozen_record/index.rb', line 10

def model
  @model
end

Instance Method Details

#build(records) ⇒ Object 



43
44
45
46
47
48
49
50
 
# File 'lib/frozen_record/index.rb', line 43

def build(records)
  @index = records.each_with_object({}) do |record, index|
    entry = (index[record[attribute]] ||= [])
    entry << record
  end
  @index.values.each(&:freeze)
  @index.freeze
end

#lookup(value) ⇒ Object 



35
36
37
 
# File 'lib/frozen_record/index.rb', line 35

def lookup(value)
  @index.fetch(value, EMPTY_ARRAY)
end

#lookup_multi(values) ⇒ Object 



31
32
33
 
# File 'lib/frozen_record/index.rb', line 31

def lookup_multi(values)
  values.flat_map { |v| lookup(v) }
end

#query(value) ⇒ Object 



22
23
24
25
26
27
28
29
 
# File 'lib/frozen_record/index.rb', line 22

def query(value)
  case value
  when Array, Range
    lookup_multi(value)
  else
    lookup(value)
  end
end

#reset ⇒ Object 



39
40
41
 
# File 'lib/frozen_record/index.rb', line 39

def reset
  @index = nil
end

#unique? ⇒ Boolean

Returns:

  • (Boolean) 


18
19
20
 
# File 'lib/frozen_record/index.rb', line 18

def unique?
  false
end