second and third talk

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+# First class rest APIs with symfony
+
+## Who
+- @michaelcullumuk
+- Works for bud. (2 weeks ago)
+- core team at syfony
+- fig working group
+- fig security
+
+## WTF IS REST?
+
+- Paper by roy fielding
+- dry and boring
+- Representational State Transfer (REST)
+- Communicating state
+
+### How to comply to REST
+
+- Uniform interface
+    - Each api works the same at a ui level
+    - Gives all data to client that client can then use to give back and modify
+    - use mime types
+    - Hyperdata. Link to other data.
+
+- Stateless
+    - No session
+    - Self contained in one request
+    - Auth in the request
+
+- Cacheable
+    - If not cacheable, you need to tell clients this
+
+- Client-Server need to be distinguishable
+    - Independently build client and server
+
+- Layered system
+    - May not be talking to an end user
+    - May be other applications or proxies or API in between
+    - (like micro services talk adding auth or similar at certain APIs)
+
+- Code on demand
+    - Be able to run code on the server
+    - Legacy.
+    - bit weird
+    - considered optional
+
+- USE HTTP WELL
+    - HTTP is your friend
+    - RESTful does not discuss http
+    - HTTP VERBS
+    - USE THEM ALL
+    - (Google crawling with GET, where they hit a GET verm delete end point)
+    - USE RESPONSE CODES
+    - Rate Limiting + use codes (429)
+    - 503 for when there's issues
+
+- In symfony
+    - Use the constants
+
+## Errors
+Exception controller
+Does logging
+Return our json response
+getErrors() handles error once in one function, included for all controllers
+
+## DTO ALL THE THINGS
+- in PHP we tend to use arrays lots
+- Decode some JSON and might put it into array
+- bad as we have no typing
+- We can use typing to move complication and validation of data to PHP level
+- Reduces typos etc
+- In symfony we can auto-hydrate stuff
+    - mapAndPersist
+    - A dataTransferObjectConvertor
+
+## Validation
+- Exceptions
+    - Exceptional case
+    - Should expect edge cases and failings
+    - Remove control from controllers
+        - isValid in the controller forces us to have logic in the controller
+        - instead try and persist an object, throw new exception
+
+## Output
+    - Symfony serializer component
+    - Choose output types easily
+    - Transformers to migrate the data from an entity and map to response data
+    - Allows us to focus on API respires not database layer entities
+    - PHPLeaue FRACTAL (for transformers)
+    - Transformers allow us to be explicit!
+    - Using fractal can build our json but bhandke collections, pagination etc
+
+## Nobody likes pagination
+    - Pain in the arse
+    - Clients need to work out logic for reading
+    - Server side we have extra logic, limits etc
+
+    How to do it then?
+    - Do it
+    - Link to next and previous (hyper media)
+    - Detail current page
+    - Detail total number of pages
+        - Assuming you know
+        - Disabling totals speeds things up
+        - Perhaps client option
+    - Use paginator tools
+    - Really simple controllers
+
+## Sorts and filters
+- query string
+    - pagiantion
+    - sorting
+    - includes
+    - filters
+
+## Tools
+- Api platform
+    - EZ PZ
+- FOS REST
+    - automatic routing
+    - slugs etc
+
+# RECAP
+PRINCIPLES OF REST
+USE HTTP WELL - verbs and codes
+ERROR handling, abstracting validation. Handle expections for response codes
+DTOs and param convertor
+Validation bubbles, catch and re-throw
+Fromatting output wiht transformes
+Pagination - annoying but easy, if we p[ass via repos.
+Sorts and filters similar to Pagination
+Tools!!! Use em.]
+
+
+
+# Useful Link
+https://github.com/FriendsOfSymfony/FOSRestBundle
+https://github.com/whiteoctober/Pagerfanta
+https://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm
+https://en.wikipedia.org/wiki/Data_transfer_object
+https://fractal.thephpleague.com/
+https://api-platform.com/