Class: DataModel::Struct

Inherits:
Object
  • Object
show all
Defined in:
lib/data_model/struct.rb

Overview

A struct that has typed properties, which will raise when the wrong type is assigned

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = {}, coerce: false, strict: true) ⇒ void

Parameters:

  • data (Hash) (defaults to: {}) —

    the data to initialize the struct with

  • coerce (Boolean) (defaults to: false) —

    whether to coerce the data if it is not correctly typed

  • strict (Boolean) (defaults to: true) —

    whether to raise if a required field is missing



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# File 'lib/data_model/struct.rb', line 85

def initialize(data = {}, coerce: false, strict: true)
	@coerce = coerce
	@strict = strict
	@values = {}
	@errors = Error.new

	if data.nil?
		return
	end

	for k, v in data
		send("#{k}=", v)
	end

	required_types = self.class.required_types
	found = []

	for req in required_types
		for key in data.keys
			if key.to_s == req.to_s
				found << req
				break
			end
		end
	end

	found = required_types - found
	if !found.empty?
		raise "Missing required fields: #{found.join(', ')}"
	end
end

Class Attribute Details

.required_types ⇒ Array<Symbol> (readonly)

required types configured by the prop macro

Returns:

  • (Array<Symbol>) —

    the required types configured



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# File 'lib/data_model/struct.rb', line 11

def required_types
  @required_types
end

.types ⇒ Hash (readonly)

types configured by the prop macro

Returns:

  • (Hash) —

    the types configured



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# File 'lib/data_model/struct.rb', line 7

def types
  @types
end

Instance Attribute Details

#errors ⇒ Error (readonly)

Returns the errors for this struct.

Returns:

  • (Error) —

    the errors for this struct



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# File 'lib/data_model/struct.rb', line 79

def errors
  @errors
end

Class Method Details

.prop(name, schema, opts = {}) ⇒ void

This method returns an undefined value.

Define a property on the struct.

Parameters:

  • name (Symbol) —

    the name of the property

  • schema (Array) —

    the schema to define

  • opts (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (opts):

  • :default (Boolean) —

    the default value for the property



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# File 'lib/data_model/struct.rb', line 19

def self.prop(name, schema, opts = {})
	has_default = opts.key?(:default)
	default = opts[:default]

	# ensure values are initialized
	@types ||= {}
	@required_types ||= []

	# if a prop does not have a default, it is required
	if !has_default
		@required_types << name
	end

	# store the data model for the prop
	schema = Array(schema)
	@types[name] = DataModel.define(schema)

	# field getter
	define_method(name) do
		@values ||= {}
		types = self.class.types

		if !types.key?(name)
			raise "No prop configured for #{name}"
		end

		if !@values.key?(name) && has_default
			return default
		end

		return @values[name]
	end

	# field setter
	define_method("#{name}=") do |val|
		@values ||= {}
		types = self.class.types

		if !types.key?(name)
			raise "No prop configured for #{name}"
		end

		model = types.fetch(name)

		if @coerce
			val, err = model.coerce(val)
		else
			err = model.validate(val)
		end

		if @strict && err.any?
			errors.merge_child(prop, err)
			raise "Invalid value for #{name}: #{err.to_messages.inspect}"
		end

		@values[name] = val
	end
end

Instance Method Details

#to_hash ⇒ Hash

convert struct to a hash

Returns:

  • (Hash) —

    the struct as a hash



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# File 'lib/data_model/struct.rb', line 119

def to_hash
	@values
end