module ActiveRecord
  # = Active Record \RecordInvalid
  #
  # Raised by {ActiveRecord::Base#save!}[rdoc-ref:Persistence#save!] and
  # {ActiveRecord::Base#create!}[rdoc-ref:Persistence::ClassMethods#create!] when the record is invalid.
  # Use the #record method to retrieve the record which did not validate.
  #
  #   begin
  #     complex_operation_that_internally_calls_save!
  #   rescue ActiveRecord::RecordInvalid => invalid
  #     puts invalid.record.errors
  #   end
  class RecordInvalid < ActiveRecordError
    attr_reader :record

    def initialize(record = nil)
      if record
        @record = record
        errors = @record.errors.full_messages.join(", ")
        message = I18n.t(:"#{@record.class.i18n_scope}.errors.messages.record_invalid", errors: errors, default: :"errors.messages.record_invalid")
      else
        message = "Record invalid"
      end

      super(message)
    end
  end

  # = Active Record \Validations
  #
  # Active Record includes the majority of its validations from ActiveModel::Validations
  # all of which accept the <tt>:on</tt> argument to define the context where the
  # validations are active. Active Record will always supply either the context of
  # <tt>:create</tt> or <tt>:update</tt> dependent on whether the model is a
  # {new_record?}[rdoc-ref:Persistence#new_record?].
  module Validations
    extend ActiveSupport::Concern
    include ActiveModel::Validations

    # The validation process on save can be skipped by passing <tt>validate: false</tt>.
    # The regular {ActiveRecord::Base#save}[rdoc-ref:Persistence#save] method is replaced
    # with this when the validations module is mixed in, which it is by default.
    def save(options={})
      perform_validations(options) ? super : false
    end

    # Attempts to save the record just like {ActiveRecord::Base#save}[rdoc-ref:Base#save] but
    # will raise an ActiveRecord::RecordInvalid exception instead of returning +false+ if the record is not valid.
    def save!(options={})
      perform_validations(options) ? super : raise_validation_error
    end

    # Runs all the validations within the specified context. Returns +true+ if
    # no errors are found, +false+ otherwise.
    #
    # Aliased as #validate.
    #
    # If the argument is +false+ (default is +nil+), the context is set to <tt>:create</tt> if
    # {new_record?}[rdoc-ref:Persistence#new_record?] is +true+, and to <tt>:update</tt> if it is not.
    #
    # \Validations with no <tt>:on</tt> option will run no matter the context. \Validations with
    # some <tt>:on</tt> option will only run in the specified context.
    def valid?(context = nil)
      context ||= default_validation_context
      output = super(context)
      errors.empty? && output
    end

    alias_method :validate, :valid?

  protected

    def default_validation_context
      new_record? ? :create : :update
    end

    def raise_validation_error
      raise(RecordInvalid.new(self))
    end

    def perform_validations(options={}) # :nodoc:
      options[:validate] == false || valid?(options[:context])
    end
  end
end

require "active_record/validations/associated"
require "active_record/validations/uniqueness"
require "active_record/validations/presence"
require "active_record/validations/absence"
require "active_record/validations/length"
