437 lines
15 KiB
Ruby
437 lines
15 KiB
Ruby
# frozen_string_literal: true
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require "active_support/core_ext/array/extract_options"
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module ActiveModel
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# == Active \Model \Validations
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#
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# Provides a full validation framework to your objects.
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#
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# A minimal implementation could be:
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :first_name, :last_name
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#
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# validates_each :first_name, :last_name do |record, attr, value|
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# record.errors.add attr, "starts with z." if value.start_with?("z")
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# end
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# end
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#
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# Which provides you with the full standard validation stack that you
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# know from Active Record:
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#
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# person = Person.new
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# person.valid? # => true
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# person.invalid? # => false
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#
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# person.first_name = 'zoolander'
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# person.valid? # => false
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# person.invalid? # => true
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# person.errors.messages # => {first_name:["starts with z."]}
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#
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# Note that <tt>ActiveModel::Validations</tt> automatically adds an +errors+
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# method to your instances initialized with a new <tt>ActiveModel::Errors</tt>
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# object, so there is no need for you to do this manually.
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module Validations
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extend ActiveSupport::Concern
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included do
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extend ActiveModel::Naming
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extend ActiveModel::Callbacks
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extend ActiveModel::Translation
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extend HelperMethods
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include HelperMethods
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attr_accessor :validation_context
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private :validation_context=
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define_callbacks :validate, scope: :name
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class_attribute :_validators, instance_writer: false, default: Hash.new { |h, k| h[k] = [] }
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end
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module ClassMethods
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# Validates each attribute against a block.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :first_name, :last_name
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#
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# validates_each :first_name, :last_name, allow_blank: true do |record, attr, value|
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# record.errors.add attr, "starts with z." if value.start_with?("z")
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# end
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# end
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#
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# Options:
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# * <tt>:on</tt> - Specifies the contexts where this validation is active.
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# Runs in all validation contexts by default +nil+. You can pass a symbol
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# or an array of symbols. (e.g. <tt>on: :create</tt> or
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# <tt>on: :custom_validation_context</tt> or
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# <tt>on: [:create, :custom_validation_context]</tt>)
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# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+.
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# * <tt>:allow_blank</tt> - Skip validation if attribute is blank.
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine
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# if the validation should occur (e.g. <tt>if: :allow_validation</tt>,
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# or <tt>if: Proc.new { |user| user.signup_step > 2 }</tt>). The method,
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# proc or string should return or evaluate to a +true+ or +false+ value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to
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# determine if the validation should not occur (e.g. <tt>unless: :skip_validation</tt>,
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# or <tt>unless: Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a +true+ or +false+
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# value.
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def validates_each(*attr_names, &block)
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validates_with BlockValidator, _merge_attributes(attr_names), &block
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end
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VALID_OPTIONS_FOR_VALIDATE = [:on, :if, :unless, :prepend].freeze # :nodoc:
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# Adds a validation method or block to the class. This is useful when
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# overriding the +validate+ instance method becomes too unwieldy and
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# you're looking for more descriptive declaration of your validations.
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#
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# This can be done with a symbol pointing to a method:
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#
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# class Comment
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# include ActiveModel::Validations
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#
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# validate :must_be_friends
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#
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# def must_be_friends
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# errors.add(:base, 'Must be friends to leave a comment') unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# With a block which is passed with the current record to be validated:
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#
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# class Comment
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# include ActiveModel::Validations
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#
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# validate do |comment|
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# comment.must_be_friends
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# end
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#
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# def must_be_friends
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# errors.add(:base, 'Must be friends to leave a comment') unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# Or with a block where self points to the current record to be validated:
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#
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# class Comment
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# include ActiveModel::Validations
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#
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# validate do
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# errors.add(:base, 'Must be friends to leave a comment') unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# Note that the return value of validation methods is not relevant.
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# It's not possible to halt the validate callback chain.
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#
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# Options:
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# * <tt>:on</tt> - Specifies the contexts where this validation is active.
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# Runs in all validation contexts by default +nil+. You can pass a symbol
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# or an array of symbols. (e.g. <tt>on: :create</tt> or
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# <tt>on: :custom_validation_context</tt> or
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# <tt>on: [:create, :custom_validation_context]</tt>)
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine
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# if the validation should occur (e.g. <tt>if: :allow_validation</tt>,
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# or <tt>if: Proc.new { |user| user.signup_step > 2 }</tt>). The method,
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# proc or string should return or evaluate to a +true+ or +false+ value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to
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# determine if the validation should not occur (e.g. <tt>unless: :skip_validation</tt>,
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# or <tt>unless: Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a +true+ or +false+
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# value.
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#
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# NOTE: Calling +validate+ multiple times on the same method will overwrite previous definitions.
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#
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def validate(*args, &block)
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options = args.extract_options!
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if args.all? { |arg| arg.is_a?(Symbol) }
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options.each_key do |k|
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unless VALID_OPTIONS_FOR_VALIDATE.include?(k)
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raise ArgumentError.new("Unknown key: #{k.inspect}. Valid keys are: #{VALID_OPTIONS_FOR_VALIDATE.map(&:inspect).join(', ')}. Perhaps you meant to call `validates` instead of `validate`?")
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end
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end
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end
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if options.key?(:on)
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options = options.dup
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options[:on] = Array(options[:on])
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options[:if] = Array(options[:if])
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options[:if].unshift ->(o) {
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!(options[:on] & Array(o.validation_context)).empty?
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}
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end
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set_callback(:validate, *args, options, &block)
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end
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# List all validators that are being used to validate the model using
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# +validates_with+ method.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# validates_with MyValidator
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# validates_with OtherValidator, on: :create
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# validates_with StrictValidator, strict: true
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# end
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#
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# Person.validators
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# # => [
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# # #<MyValidator:0x007fbff403e808 @options={}>,
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# # #<OtherValidator:0x007fbff403d930 @options={on: :create}>,
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# # #<StrictValidator:0x007fbff3204a30 @options={strict:true}>
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# # ]
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def validators
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_validators.values.flatten.uniq
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end
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# Clears all of the validators and validations.
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#
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# Note that this will clear anything that is being used to validate
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# the model for both the +validates_with+ and +validate+ methods.
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# It clears the validators that are created with an invocation of
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# +validates_with+ and the callbacks that are set by an invocation
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# of +validate+.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# validates_with MyValidator
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# validates_with OtherValidator, on: :create
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# validates_with StrictValidator, strict: true
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# validate :cannot_be_robot
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#
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# def cannot_be_robot
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# errors.add(:base, 'A person cannot be a robot') if person_is_robot
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# end
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# end
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#
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# Person.validators
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# # => [
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# # #<MyValidator:0x007fbff403e808 @options={}>,
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# # #<OtherValidator:0x007fbff403d930 @options={on: :create}>,
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# # #<StrictValidator:0x007fbff3204a30 @options={strict:true}>
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# # ]
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#
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# If one runs <tt>Person.clear_validators!</tt> and then checks to see what
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# validators this class has, you would obtain:
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#
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# Person.validators # => []
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#
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# Also, the callback set by <tt>validate :cannot_be_robot</tt> will be erased
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# so that:
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#
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# Person._validate_callbacks.empty? # => true
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#
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def clear_validators!
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reset_callbacks(:validate)
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_validators.clear
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end
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# List all validators that are being used to validate a specific attribute.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name , :age
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#
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# validates_presence_of :name
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# validates_inclusion_of :age, in: 0..99
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# end
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#
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# Person.validators_on(:name)
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# # => [
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# # #<ActiveModel::Validations::PresenceValidator:0x007fe604914e60 @attributes=[:name], @options={}>,
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# # ]
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def validators_on(*attributes)
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attributes.flat_map do |attribute|
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_validators[attribute.to_sym]
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end
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end
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# Returns +true+ if +attribute+ is an attribute method, +false+ otherwise.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# end
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#
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# User.attribute_method?(:name) # => true
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# User.attribute_method?(:age) # => false
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def attribute_method?(attribute)
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method_defined?(attribute)
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end
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# Copy validators on inheritance.
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def inherited(base) #:nodoc:
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dup = _validators.dup
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base._validators = dup.each { |k, v| dup[k] = v.dup }
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super
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end
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end
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# Clean the +Errors+ object if instance is duped.
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def initialize_dup(other) #:nodoc:
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@errors = nil
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super
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end
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# Returns the +Errors+ object that holds all information about attribute
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# error messages.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# validates_presence_of :name
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# end
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#
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# person = Person.new
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# person.valid? # => false
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# person.errors # => #<ActiveModel::Errors:0x007fe603816640 @messages={name:["can't be blank"]}>
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def errors
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@errors ||= Errors.new(self)
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end
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# Runs all the specified validations and returns +true+ if no errors were
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# added otherwise +false+.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# validates_presence_of :name
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# end
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#
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# person = Person.new
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# person.name = ''
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# person.valid? # => false
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# person.name = 'david'
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# person.valid? # => true
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#
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# Context can optionally be supplied to define which callbacks to test
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# against (the context is defined on the validations using <tt>:on</tt>).
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# validates_presence_of :name, on: :new
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# end
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#
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# person = Person.new
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# person.valid? # => true
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# person.valid?(:new) # => false
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def valid?(context = nil)
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current_context, self.validation_context = validation_context, context
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errors.clear
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run_validations!
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ensure
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self.validation_context = current_context
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end
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alias_method :validate, :valid?
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# Performs the opposite of <tt>valid?</tt>. Returns +true+ if errors were
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# added, +false+ otherwise.
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# validates_presence_of :name
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# end
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#
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# person = Person.new
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# person.name = ''
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# person.invalid? # => true
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# person.name = 'david'
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# person.invalid? # => false
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#
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# Context can optionally be supplied to define which callbacks to test
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# against (the context is defined on the validations using <tt>:on</tt>).
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#
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# class Person
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# include ActiveModel::Validations
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#
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# attr_accessor :name
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# validates_presence_of :name, on: :new
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# end
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#
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# person = Person.new
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# person.invalid? # => false
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# person.invalid?(:new) # => true
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def invalid?(context = nil)
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!valid?(context)
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end
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# Runs all the validations within the specified context. Returns +true+ if
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# no errors are found, raises +ValidationError+ otherwise.
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#
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# Validations with no <tt>:on</tt> option will run no matter the context. Validations with
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# some <tt>:on</tt> option will only run in the specified context.
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def validate!(context = nil)
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valid?(context) || raise_validation_error
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end
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# Hook method defining how an attribute value should be retrieved. By default
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# this is assumed to be an instance named after the attribute. Override this
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# method in subclasses should you need to retrieve the value for a given
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# attribute differently:
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#
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# class MyClass
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# include ActiveModel::Validations
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#
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# def initialize(data = {})
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# @data = data
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# end
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#
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# def read_attribute_for_validation(key)
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# @data[key]
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# end
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# end
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alias :read_attribute_for_validation :send
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private
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def run_validations!
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_run_validate_callbacks
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errors.empty?
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end
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def raise_validation_error # :doc:
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raise(ValidationError.new(self))
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end
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end
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# = Active Model ValidationError
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#
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# Raised by <tt>validate!</tt> when the model is invalid. Use the
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# +model+ method to retrieve the record which did not validate.
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#
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# begin
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# complex_operation_that_internally_calls_validate!
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# rescue ActiveModel::ValidationError => invalid
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# puts invalid.model.errors
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# end
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class ValidationError < StandardError
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attr_reader :model
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def initialize(model)
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@model = model
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errors = @model.errors.full_messages.join(", ")
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super(I18n.t(:"#{@model.class.i18n_scope}.errors.messages.model_invalid", errors: errors, default: :"errors.messages.model_invalid"))
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end
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end
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end
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Dir[File.expand_path("validations/*.rb", __dir__)].each { |file| require file }
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