Module: Formtastic::Inputs::Base::GroupedCollections

Included in:
SelectInput
Defined in:
lib/formtastic/inputs/base/grouped_collections.rb

Instance Method Summary collapse

Instance Method Details

#group_association ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 26

def group_association
  @group_association ||= (group_association_from_options || group_association_from_reflection)
end

#group_association_from_options ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 30

def group_association_from_options
  options[:group_association]
end

#group_association_from_reflection ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 38

def group_association_from_reflection
  method_to_group_association_by = reflection.klass.reflect_on_association(group_by)
  group_class = method_to_group_association_by.klass
      
  # This will return in the normal case
  return method.to_s.pluralize.to_sym if group_class.reflect_on_association(method.to_s.pluralize)
      
  # This is for belongs_to associations named differently than their class
  # form.input :parent, :group_by => :customer
  # eg.
  # class Project
  #   belongs_to :parent, :class_name => 'Project', :foreign_key => 'parent_id'
  #   belongs_to :customer
  # end
  # class Customer
  #   has_many :projects
  # end
  group_method = group_class.to_s.underscore.pluralize.to_sym
  return group_method if group_class.reflect_on_association(group_method) # :projects
      
  # This is for has_many associations named differently than their class
  # eg.
  # class Project
  #   belongs_to :parent, :class_name => 'Project', :foreign_key => 'parent_id'
  #   belongs_to :customer
  # end
  # class Customer
  #   has_many :tasks, :class_name => 'Project', :foreign_key => 'customer_id'
  # end
  possible_associations = group_class.reflect_on_all_associations(:has_many).find_all {|assoc| assoc.klass == reflection.klass }
  return possible_associations.first.name.to_sym if possible_associations.count == 1
      
  raise "Cannot infer group association for #{method} grouped by #{group_by}, there were #{possible_associations.empty? ? 'no' : possible_associations.size} possible associations. Please specify using :group_association"
end

#group_by ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 34

def group_by
  options[:group_by]
end

#group_label_method ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 14

def group_label_method
  @group_label_method ||= (group_label_method_from_options || group_label_method_from_grouped_collection)
end

#group_label_method_from_grouped_collection ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 22

def group_label_method_from_grouped_collection
  label_and_value_method_from_collection(raw_grouped_collection).first
end

#group_label_method_from_options ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 18

def group_label_method_from_options
  options[:group_label]
end

#grouped_collection ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 10

def grouped_collection
  @grouped_collection ||= raw_grouped_collection.sort_by { |group_item| group_item.send(group_label_method) }
end

#raw_grouped_collection ⇒ Object 



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# File 'lib/formtastic/inputs/base/grouped_collections.rb', line 6

def raw_grouped_collection
  @raw_grouped_collection ||= raw_collection.map { |option| option.send(options[:group_by]) }.uniq
end