Basic API using Ruby On Rails

Create an API for the following system. Its just pure API only so your application should not take HTML format as input. It should ONLY accept when request format is 'application/json'. This means your application will not need any HTML pages or views. It should not have any .[login to view URL] files. And if I make a request with HTML format you should respond back saying invalid format. It should have all validations and you can assume few attributes for every resource. For ex: Doctor should name, email, office, phone, speciality etc.. etc.. Health System: API 1: Create an API for CRUD operations on Patient resource. API 2: Create an API for CRUD operations on Doctor resource. API 3: Create an API for CRUD operations on Appointment resource. You need a description, a doctor, a patient and a time for an appointment. API 4: For a given patient, give me all appointments API 5: For a given doctor, give me all appointments API 6: For a given patient and doctor, give me all future appointments. Future only API 7: For a given date, show me all appointments on that specific date. Relationships: Many to Many association between Patient and Doctor resource through Appointment resource. Once again, APIs only with JSON format as request/response. Extra credit if you can write test cases for any ONE model.