Class: MiniDefender::Rules::Unique

Inherits:
MiniDefender::Rule show all
Defined in:
lib/mini_defender/rules/unique.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from MiniDefender::Rule

#active?, available?, #bails?, #coerce, #default_value, #defaults?, #error_message, #excluded?, #force_coerce?, #implicit?, #priority, #stops?, #with_message

Constructor Details

#initialize(model, column = nil) ⇒ Unique

Returns a new instance of Unique.

Raises:

  • (ArgumentError) 


4
5
6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/mini_defender/rules/unique.rb', line 4

def initialize(model, column = nil)
  unless model.is_a?(String) || model.is_a?(Class) && model.ancestors.include?(ActiveRecord::Base)
    raise ArgumentError, 'model name must be a string or ActiveRecord::Base'
  end

  raise ArgumentError, 'Column name must be a string' unless column.is_a?(String) || column.nil?

  @model = model
  @model = @model.camelcase.constantize if model.is_a?(String)
  @column = column
  @ignore = nil
  @additional_scope = nil
end

Class Method Details

.make(args) ⇒ Object

Raises:

  • (ArgumentError) 


32
33
34
35
36
 
# File 'lib/mini_defender/rules/unique.rb', line 32

def self.make(args)
  raise ArgumentError, 'Model and column are required.' unless args.length == 2

  self.new(args[0], args[1])
end

.signature ⇒ Object 



18
19
20
 
# File 'lib/mini_defender/rules/unique.rb', line 18

def self.signature
  'unique'
end

Instance Method Details

#message(attribute, value, validator) ⇒ Object 



48
49
50
 
# File 'lib/mini_defender/rules/unique.rb', line 48

def message(attribute, value, validator)
  "The value already exists."
end

#passes?(attribute, value, validator) ⇒ Boolean

Returns:



38
39
40
41
42
43
44
45
46
 
# File 'lib/mini_defender/rules/unique.rb', line 38

def passes?(attribute, value, validator)
  @column = attribute.split('.')[-1] if @column.nil?

  query = @model.where(@column => value)
  query = @additional_scope.call(query) unless @additional_scope.nil?
  query = query.where.not(@column => @ignore) unless @ignore.nil?

  !query.exists?
end

#scope_by(callback) ⇒ Object 



27
28
29
30
 
# File 'lib/mini_defender/rules/unique.rb', line 27

def scope_by(callback)
  @additional_scope = callback
  self
end

#should_ignore(value) ⇒ Object 



22
23
24
25
 
# File 'lib/mini_defender/rules/unique.rb', line 22

def should_ignore(value)
  @ignore = value
  self
end