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# frozen_string_literal: true
class ViewModel
# = View Model
#
# A View Model is a class that allows you to set an arbitrary hash of attributes and access all values by calling
# attribute methods.
#
# ==== Examples
#
# model = ViewModel.new(a: 1, b: {b1: 1, b2: 2}, c: 3)
#
# model.a # => 1
# model.b # => {b1: 1, b2: 2}
# model.c # => 3
#
# Reserved methods or attributes are left untouched. If you want to access an attribute that collides with a reserved
# method, you can do it via the +to_hash+ method.
#
# model = ViewModel.new(class: "test")
#
# model.class # => ViewModel
# model.to_hash[:class] # => "test"
def initialize(hash = {})
hash.each do |key, value|
instance_variable_set("@#{key}", value)
end
end
def attributes
instance_variables.map { |instance_variable| instance_variable.to_s.delete("@").to_sym }
end
def to_hash
attributes.map { |attribute| {attribute => value_for(attribute)} }.inject(:merge) || {}
end
alias_method :to_h, :to_hash
private
def is_defined?(attribute)
attributes.include?(attribute.to_sym)
end
def value_for(attribute)
reserved_methods.include?(attribute) ? instance_variable_get("@#{attribute}") : send(attribute)
end
def method_missing(m, *args, &block)
instance_variable_get("@#{m}")
end
def respond_to_missing?
true
end
def reserved_methods
Class.methods + Class.private_methods
end
end
Version data entries
26 entries across 26 versions & 2 rubygems