Module: DatabaseValidation::Detector

Defined in:
lib/database_validation.rb

Overview

tested with ‘mysql’ and ‘mysql2’ adapters

Class Method Summary collapse

Class Method Details

.detect_validations(base) ⇒ Object 



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# File 'lib/database_validation.rb', line 13

def self.detect_validations(base)
  base.columns.each do |field|
    next if field.name == base.primary_key # don't add validations here
    allow_nil = field.null
    
    base.send(:validates_presence_of, field.name.to_sym, :allow_nil => allow_nil) unless allow_nil
    next if field.limit.nil?

    if [:integer, :float].include?(field.type)
      unsigned = field.sql_type.include?('unsigned')
      maximum = unsigned ? 2 ** (8 * field.limit) : 2 ** (8 * field.limit) / 2
      minimum = unsigned ? -(2 ** (8 * field.limit)) - 1 : -(2 ** (8 * field.limit) / 2) - 1
      base.send(:validates_numericality_of, field.name.to_sym, :less_than => maximum, :greater_than => minimum, :allow_nil => allow_nil)
    else
      maximum = field.limit
      base.send(:validates_length_of, field.name.to_sym, :maximum => maximum, :allow_nil => allow_nil)
    end

  end
  ActiveRecord::Base.connection.indexes(base.table_name).each do |key|
    col_syms = key.columns.map(&:to_sym)
    base.send(:validates_uniqueness_of, col_syms.first.to_sym, :scope => col_syms.slice(1, -1)) if key.unique
  end
end