class Grape::Validations::ParamsScope
Attributes
Public Class Methods
Open up a new ParamsScope, allowing parameter definitions per
Grape::DSL::Params.
@param opts [Hash] options for this scope @option opts :element [Symbol] the element that contains this scope; for
this to be relevant, @parent must be set
@option opts :parent [ParamsScope] the scope containing this scope @option opts :api [API] the API endpoint to modify @option opts :optional [Boolean] whether or not this scope needs to have
any parameters set or not
@option opts :type [Class] a type meant to govern this scope (deprecated) @option opts :type [Hash] group options for this scope @option opts :dependent_on [Symbol] if present, this scope should only
validate if this param is present in the parent scope
@yield the instance context, open for parameter definitions
# File lib/grape/validations/params_scope.rb, line 23 def initialize(opts, &block) @element = opts[:element] @parent = opts[:parent] @api = opts[:api] @optional = opts[:optional] || false @type = opts[:type] @group = opts[:group] || {} @dependent_on = opts[:dependent_on] @declared_params = [] @index = nil instance_eval(&block) if block_given? configure_declared_params end
Public Instance Methods
# File lib/grape/validations/params_scope.rb, line 85 def brackets(val) "[#{val}]" if val end
@return [String] the proper attribute name, with nesting considered.
# File lib/grape/validations/params_scope.rb, line 71 def full_name(name, index: nil) if nested? # Find our containing element's name, and append ours. [@parent.full_name(@element), [@index || index, name].map(&method(:brackets))].compact.join elsif lateral? # Find the name of the element as if it was at the same nesting level # as our parent. We need to forward our index upward to achieve this. @parent.full_name(name, index: @index) else # We must be the root scope, so no prefix needed. name.to_s end end
A lateral scope is subordinate to its parent, but its keys are at the same level as its parent and thus is not contained within an element. @return [Boolean] whether or not this scope is lateral
# File lib/grape/validations/params_scope.rb, line 103 def lateral? @parent && !@element end
# File lib/grape/validations/params_scope.rb, line 48 def meets_dependency?(params, request_params) if @parent.present? && !@parent.meets_dependency?(@parent.params(request_params), request_params) return false end return true unless @dependent_on return params.any? { |param| meets_dependency?(param, request_params) } if params.is_a?(Array) params = params.with_indifferent_access @dependent_on.each do |dependency| if dependency.is_a?(Hash) dependency_key = dependency.keys[0] proc = dependency.values[0] return false unless proc.call(params.try(:[], dependency_key)) elsif params.respond_to?(:key?) && params.try(:[], dependency).blank? return false end end true end
A nested scope is contained in one of its parent's elements. @return [Boolean] whether or not this scope is nested
# File lib/grape/validations/params_scope.rb, line 96 def nested? @parent && @element end
@return [Boolean] whether or not this scope needs to be present, or can
be blank
# File lib/grape/validations/params_scope.rb, line 109 def required? !@optional end
@return [Boolean] whether or not this scope is the root-level scope
# File lib/grape/validations/params_scope.rb, line 90 def root? !@parent end
@return [Boolean] whether or not this entire scope needs to be
validated
# File lib/grape/validations/params_scope.rb, line 41 def should_validate?(parameters) return false if @optional && (params(parameters).blank? || all_element_blank?(parameters)) return false unless meets_dependency?(params(parameters), parameters) return true if parent.nil? parent.should_validate?(parameters) end
Protected Instance Methods
Adds a parameter declaration to our list of validations. @param attrs [Array] (see Grape::DSL::Parameters#requires)
# File lib/grape/validations/params_scope.rb, line 117 def push_declared_params(attrs, **opts) if lateral? @parent.push_declared_params(attrs, opts) else if opts && opts[:as] @api.route_setting(:aliased_params, @api.route_setting(:aliased_params) || []) @api.route_setting(:aliased_params) << { attrs.first => opts[:as] } end @declared_params.concat attrs end end
Private Instance Methods
# File lib/grape/validations/params_scope.rb, line 443 def all_element_blank?(parameters) params(parameters).respond_to?(:all?) && params(parameters).all?(&:blank?) end
Enforce correct usage of :coerce_with parameter. We do not allow coercion
without a type, nor with JSON
as a type since this defines its
own coercion method.
# File lib/grape/validations/params_scope.rb, line 344 def check_coerce_with(validations) return unless validations.key?(:coerce_with) # type must be supplied for coerce_with.. raise ArgumentError, 'must supply type for coerce_with' unless validations.key?(:coerce) # but not special JSON types, which # already imply coercion method return unless [JSON, Array[JSON]].include? validations[:coerce] raise ArgumentError, 'coerce_with disallowed for type: JSON' end
# File lib/grape/validations/params_scope.rb, line 386 def check_incompatible_option_values(default, values, except_values, excepts) return unless default && !default.is_a?(Proc) if values && !values.is_a?(Proc) raise Grape::Exceptions::IncompatibleOptionValues.new(:default, default, :values, values) unless Array(default).all? { |def_val| values.include?(def_val) } end if except_values && !except_values.is_a?(Proc) raise Grape::Exceptions::IncompatibleOptionValues.new(:default, default, :except, except_values) unless Array(default).none? { |def_val| except_values.include?(def_val) } end return unless excepts && !excepts.is_a?(Proc) raise Grape::Exceptions::IncompatibleOptionValues.new(:default, default, :except, excepts) unless Array(default).none? { |def_val| excepts.include?(def_val) } end
Add type coercion validation to this scope, if any has been specified. This
validation has special handling since it is composited from more than one
requires
/optional
parameter, and needs to be run
before most other validations.
# File lib/grape/validations/params_scope.rb, line 361 def coerce_type(validations, attrs, doc_attrs, opts) check_coerce_with(validations) return unless validations.key?(:coerce) coerce_options = { type: validations[:coerce], method: validations[:coerce_with], message: validations[:coerce_message] } validate('coerce', coerce_options, attrs, doc_attrs, opts) validations.delete(:coerce_with) validations.delete(:coerce) validations.delete(:coerce_message) end
Pushes declared params to parent or settings
# File lib/grape/validations/params_scope.rb, line 227 def configure_declared_params if nested? @parent.push_declared_params [element => @declared_params] else @api.namespace_stackable(:declared_params, @declared_params) @api.route_setting(:declared_params, []) unless @api.route_setting(:declared_params) @api.route_setting(:declared_params, @api.namespace_stackable(:declared_params).flatten) end end
# File lib/grape/validations/params_scope.rb, line 433 def extract_message_option(attrs) return nil unless attrs.is_a?(Array) opts = attrs.last.is_a?(Hash) ? attrs.pop : {} opts.key?(:message) && !opts[:message].nil? ? opts.delete(:message) : nil end
# File lib/grape/validations/params_scope.rb, line 377 def guess_coerce_type(coerce_type, *values_list) return coerce_type unless coerce_type == Array values_list.each do |values| next if !values || values.is_a?(Proc) return values.first.class if values.is_a?(Range) || !values.empty? end coerce_type end
Validate and comprehend the :type
, :types
, and
:coerce_with
options that have been supplied to the parameter
declaration. The :type
and :types
options will be
removed from the validations list, replaced appropriately with
:coerce
and :coerce_with
options that will later
be passed to {Validators::CoerceValidator}. The type that is returned may
be used for documentation and further validation of parameter options.
@param validations [Hash] list of validations supplied to the
parameter declaration
@return [class-like] type to which the parameter will be coerced @raise [ArgumentError] if the given type options are invalid
# File lib/grape/validations/params_scope.rb, line 313 def infer_coercion(validations) if validations.key?(:type) && validations.key?(:types) raise ArgumentError, ':type may not be supplied with :types' end validations[:coerce] = (options_key?(:type, :value, validations) ? validations[:type][:value] : validations[:type]) if validations.key?(:type) validations[:coerce_message] = (options_key?(:type, :message, validations) ? validations[:type][:message] : nil) if validations.key?(:type) validations[:coerce] = (options_key?(:types, :value, validations) ? validations[:types][:value] : validations[:types]) if validations.key?(:types) validations[:coerce_message] = (options_key?(:types, :message, validations) ? validations[:types][:message] : nil) if validations.key?(:types) validations.delete(:types) if validations.key?(:types) coerce_type = validations[:coerce] # Special case - when the argument is a single type that is a # variant-type collection. if Types.multiple?(coerce_type) && validations.key?(:type) validations[:coerce] = Types::VariantCollectionCoercer.new( coerce_type, validations.delete(:coerce_with) ) end validations.delete(:type) coerce_type end
Returns a new parameter scope, subordinate to the current one and nested under the parameter corresponding to `attrs.first`. @param attrs [Array] the attributes passed to the `requires` or
`optional` invocation that opened this scope.
@yield parameter scope
# File lib/grape/validations/params_scope.rb, line 217 def new_group_scope(attrs, &block) self.class.new( api: @api, parent: self, group: attrs.first, &block ) end
Returns a new parameter scope, not nested under any current-level param but instead at the same level as the current scope. @param options [Hash] options to control how this new scope behaves @option options :dependent_on [Symbol] if given, specifies that this
scope should only validate if this parameter from the above scope is present
@yield parameter scope
# File lib/grape/validations/params_scope.rb, line 200 def new_lateral_scope(options, &block) self.class.new( api: @api, element: nil, parent: self, options: @optional, type: type == Array ? Array : Hash, dependent_on: options[:dependent_on], &block ) end
Returns a new parameter scope, subordinate to the current one and nested under the parameter corresponding to `attrs.first`. @param attrs [Array] the attributes passed to the `requires` or
`optional` invocation that opened this scope.
@param optional [Boolean] whether the parameter this are nested under
is optional or not (and hence, whether this block's params will be).
@yield parameter scope
# File lib/grape/validations/params_scope.rb, line 173 def new_scope(attrs, optional = false, &block) # if required params are grouped and no type or unsupported type is provided, raise an error type = attrs[1] ? attrs[1][:type] : nil if attrs.first && !optional raise Grape::Exceptions::MissingGroupTypeError.new if type.nil? raise Grape::Exceptions::UnsupportedGroupTypeError.new unless Grape::Validations::Types.group?(type) end opts = attrs[1] || { type: Array } self.class.new( api: @api, element: attrs.first, parent: self, optional: optional, type: opts[:type], &block ) end
# File lib/grape/validations/params_scope.rb, line 439 def options_key?(type, key, validations) validations[type].respond_to?(:key?) && validations[type].key?(key) && !validations[type][key].nil? end
# File lib/grape/validations/params_scope.rb, line 151 def require_optional_fields(context, opts) optional_fields = opts[:using].keys optional_fields -= Array(opts[:except]) unless context == :all optional_fields.each do |field| field_opts = opts[:using][field] optional(field, field_opts) if field_opts end end
# File lib/grape/validations/params_scope.rb, line 132 def require_required_and_optional_fields(context, opts) if context == :all optional_fields = Array(opts[:except]) required_fields = opts[:using].keys - optional_fields else # context == :none required_fields = Array(opts[:except]) optional_fields = opts[:using].keys - required_fields end required_fields.each do |field| field_opts = opts[:using][field] raise ArgumentError, "required field not exist: #{field}" unless field_opts requires(field, field_opts) end optional_fields.each do |field| field_opts = opts[:using][field] optional(field, field_opts) if field_opts end end
# File lib/grape/validations/params_scope.rb, line 404 def validate(type, options, attrs, doc_attrs, opts) validator_class = Validations.validators[type.to_s] raise Grape::Exceptions::UnknownValidator.new(type) unless validator_class factory = Grape::Validations::ValidatorFactory.new(attributes: attrs, options: options, required: doc_attrs[:required], params_scope: self, opts: opts, validator_class: validator_class) @api.namespace_stackable(:validations, factory) end
# File lib/grape/validations/params_scope.rb, line 160 def validate_attributes(attrs, opts, &block) validations = opts.clone validations[:type] ||= Array if block validates(attrs, validations) end
# File lib/grape/validations/params_scope.rb, line 418 def validate_value_coercion(coerce_type, *values_list) return unless coerce_type coerce_type = coerce_type.first if coerce_type.is_a?(Array) values_list.each do |values| next if !values || values.is_a?(Proc) value_types = values.is_a?(Range) ? [values.begin, values.end] : values if coerce_type == Virtus::Attribute::Boolean value_types = value_types.map { |type| Virtus::Attribute.build(type) } end unless value_types.all? { |v| v.is_a? coerce_type } raise Grape::Exceptions::IncompatibleOptionValues.new(:type, coerce_type, :values, values) end end end
# File lib/grape/validations/params_scope.rb, line 238 def validates(attrs, validations) doc_attrs = { required: validations.keys.include?(:presence) } coerce_type = infer_coercion(validations) doc_attrs[:type] = coerce_type.to_s if coerce_type desc = validations.delete(:desc) || validations.delete(:description) doc_attrs[:desc] = desc if desc default = validations[:default] doc_attrs[:default] = default if validations.key?(:default) if (values_hash = validations[:values]).is_a? Hash values = values_hash[:value] # NB: excepts is deprecated excepts = values_hash[:except] else values = validations[:values] end doc_attrs[:values] = values if values except_values = options_key?(:except_values, :value, validations) ? validations[:except_values][:value] : validations[:except_values] # NB. values and excepts should be nil, Proc, Array, or Range. # Specifically, values should NOT be a Hash # use values or excepts to guess coerce type when stated type is Array coerce_type = guess_coerce_type(coerce_type, values, except_values, excepts) # default value should be present in values array, if both exist and are not procs check_incompatible_option_values(default, values, except_values, excepts) # type should be compatible with values array, if both exist validate_value_coercion(coerce_type, values, except_values, excepts) doc_attrs[:documentation] = validations.delete(:documentation) if validations.key?(:documentation) full_attrs = attrs.collect { |name| { name: name, full_name: full_name(name) } } @api.document_attribute(full_attrs, doc_attrs) # slice out fail_fast attribute opts = {} opts[:fail_fast] = validations.delete(:fail_fast) || false # Validate for presence before any other validators if validations.key?(:presence) && validations[:presence] validate('presence', validations[:presence], attrs, doc_attrs, opts) validations.delete(:presence) validations.delete(:message) if validations.key?(:message) end # Before we run the rest of the validators, let's handle # whatever coercion so that we are working with correctly # type casted values coerce_type validations, attrs, doc_attrs, opts validations.each do |type, options| validate(type, options, attrs, doc_attrs, opts) end end