I am new to rails and stuck on one Querying issue. Here is the situation.
Model: Category class Category < ActiveRecord::Base has_and_belongs_to_many :postings has_and_belongs_to_many :volunteers end
Model: Posting class Posting < ActiveRecord::Base has_and_belongs_to_many :categories end
Model: Volunteer class Volunteer < ActiveRecord::Base has_and_belongs_to_many :categories end