Class: ActiveRecord::Validations::UniquenessValidator

### Home Classes Methods

### In Files

- lib/active_record/validations/uniqueness.rb

### Parent

ActiveModel::EachValidator

### Methods

- ::new
- #setup
- #validate_each

### Files

- README.rdoc

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No matching classes.

# ActiveRecord::Validations::UniquenessValidator

### Public Class Methods

new(options) click to toggle source

    # File lib/active_record/validations/uniqueness.rb, line 6
    def initialize(options)
      super(options.reverse_merge(:case_sensitive => true))
    end

### Public Instance Methods

setup(klass) click to toggle source

Unfortunately, we have to tie Uniqueness validators to a class.

    # File lib/active_record/validations/uniqueness.rb, line 11
    def setup(klass)
      @klass = klass
    end

validate_each(record, attribute, value) click to toggle source

    # File lib/active_record/validations/uniqueness.rb, line 15
    def validate_each(record, attribute, value)
      finder_class = find_finder_class_for(record)
      table = finder_class.unscoped

      table_name   = record.class.quoted_table_name

      if value && record.class.serialized_attributes.key?(attribute.to_s)
        value = YAML.dump value
      end

      sql, params  = mount_sql_and_params(finder_class, table_name, attribute, value)

      relation = table.where(sql, *params)

      Array.wrap(options[:scope]).each do |scope_item|
        scope_value = record.send(scope_item)
        relation = relation.where(scope_item => scope_value)
      end

      unless record.new_record?
        # TODO : This should be in Arel
        relation = relation.where("#{record.class.quoted_table_name}.#{record.class.primary_key} <> ?", record.send(:id))
      end

      if relation.exists?
        record.errors.add(attribute, :taken, options.except(:case_sensitive, :scope).merge(:value => value))
      end
    end

[Validate]

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