Class: ViewModel

Inherits:

Object

• Object
• ViewModel

Defined in:

app/models/view_model.rb

Direct Known Subclasses

Headmin::BlocksView, Headmin::Filter::BaseView, Headmin::Filter::ButtonView, Headmin::Filter::ConditionalView, Headmin::Filter::FilterView, Headmin::Filter::FlatpickrView, Headmin::Filter::MenuItemView, Headmin::Filter::OperatorView, Headmin::Filter::RowView, Headmin::Filter::SearchView, Headmin::Form::AssociationView, Headmin::Form::BlocksView, Headmin::Form::CheckboxView, Headmin::Form::ColorView, Headmin::Form::DateRangeView, Headmin::Form::DateView, Headmin::Form::DatetimeRangeView, Headmin::Form::DatetimeView, Headmin::Form::EmailView, Headmin::Form::FileView, Headmin::Form::FlatpickrRangeView, Headmin::Form::FlatpickrView, Headmin::Form::HiddenView, Headmin::Form::HintView, Headmin::Form::InputGroupView, Headmin::Form::LabelView, Headmin::Form::MediaItemView, Headmin::Form::MediaView, Headmin::Form::NumberView, Headmin::Form::PasswordView, Headmin::Form::RedactorxView, Headmin::Form::SearchView, Headmin::Form::SelectView, Headmin::Form::SwitchView, Headmin::Form::TextView, Headmin::Form::TextareaView, Headmin::Form::UrlView, Headmin::Form::WrapperView, Headmin::Form::WysiwygView, Headmin::ThumbnailView

Instance Method Summary

• #attributes ⇒ Object
• #initialize(hash = {}) ⇒ ViewModel constructor

  View Model.

• #to_hash ⇒ Object (also: #to_h)

Constructor Details

#initialize(hash = {}) ⇒ 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"

# File 'app/models/view_model.rb', line 25

def initialize(hash = {})
  hash.each do |key, value|
    instance_variable_set("@#{key}", value)
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args, &block) ⇒ Object (private)

# File 'app/models/view_model.rb', line 51

def method_missing(m, *args, &block)
  instance_variable_get("@#{m}")
end

Instance Method Details

#attributes ⇒ Object

# File 'app/models/view_model.rb', line 31

def attributes
  instance_variables.map { |instance_variable| instance_variable.to_s.delete("@").to_sym }
end

#to_hash ⇒ Object Also known as: to_h

# File 'app/models/view_model.rb', line 35

def to_hash
  attributes.map { |attribute| {attribute => value_for(attribute)} }.inject(:merge) || {}
end