Metadata-Version: 2.1
Name: flask-jsontools
Version: 0.1.7
Summary:  JSON API tools for Flask 
Home-page: https://github.com/kolypto/py-flask-jsontools
Author: Mark Vartanyan
Author-email: kolypto@gmail.com
License: BSD
Description: [![Build Status](https://api.travis-ci.org/kolypto/py-flask-jsontools.png?branch=master)](https://travis-ci.org/kolypto/py-flask-jsontools)
        [![Pythons](https://img.shields.io/badge/python-2.7%20%7C%203.4%E2%80%933.8%20%7C%20pypy-blue.svg)](.travis.yml)
        
        
        Flask JsonTools
        ===============
        
        JSON API tools for Flask
        
        Table of Contents
        =================
        
        * <a href="#view-utilities">View Utilities</a>
            * <a href="#jsonapi">@jsonapi</a>
                * <a href="#jsonresponse">JsonResponse</a>
                * <a href="#make_json_response">make_json_response()</a>
        * <a href="#flaskjsonclient">FlaskJsonClient</a>
        * <a href="#class-based-views">Class-Based Views</a>
            * <a href="#methodview">MethodView</a>
            * <a href="#restfulview">RestfulView</a> 
        
        
        
        View Utilities
        ==============
        
        @jsonapi
        --------
        
        Decorate a view function that talks JSON.
        
        Such function can return:
            
        * tuples of `(response, status[, headers])`: to set custom status code and optionally - headers
        * Instances of [`JsonResponse`](#jsonresponse)
        * The result of helper function [`make_json_response`](#make_json_response)
        
        Example:
        
        ```python
        from flask.ext.jsontools import jsonapi
        
        @app.route('/users')
        @jsonapi
        def list_users():
            return [
                {'id': 1, 'login': 'kolypto'},
                #...
            ]
           
        @app.route('/user/<int:id>', methods=['DELETE'])
        def delete_user(id):
            return {'error': 'Access denied'}, 403
        ```
        
        ### JsonResponse
        
        Extends [`flask.Request`](http://flask.pocoo.org/docs/api/#incoming-request-data) and encodes the response with JSON.
        Views decorated with [`@jsonapi`](#jsonapi) return these objects.
        
        Arguments:
        
        * `response`: response data
        * `status`: status code. Optional, defaults to 200
        * `headers`: additional headers dict. Optional.
        * `**kwargs`: additional argumets for [`Response`](http://flask.pocoo.org/docs/api/#response-objects)
        
        Methods:
        
        * `preprocess_response_data(response)`: Override to get custom response behavior.
        * `get_json()`: Get the original response data.
        * `__getitem__(key)`: Get an item from the response data
        
        The extra methods allows to reuse views:
        
        ```python
        from flask.ext.jsontools import jsonapi
        
        @app.route('/user', methods=['GET'])
        @jsonapi
        def list_users():
            return [ { 1: 'first', 2: 'second' } ]
            
        @app.route('/user/<int:id>', methods=['GET'])
        @jsonapi
        def get_user(id):
            return list_users().get_json()[id]  # Long form
            return list_users()[id]  # Shortcut
        ```
        
        ### make_json_response()
        Helper function that actually preprocesses view return value into [`JsonResponse`](#jsonresponse).
        
        Accepts `rv` as any of:
        
        * tuple of `(response, status[, headers])`
        * Object to encode as JSON
        
        
        
        
        
        
        FlaskJsonClient
        ===============
        
        FlaskJsonClient is a JSON-aware test client: it can post JSON and parse JSON responses into [`JsonResponse`](#jsonresponse).
        
        ```python
        from myapplication import Application
        from flask.ext.jsontools import FlaskJsonClient
        
        def JsonTest(unittest.TestCase):
            def setUp(self):
                self.app = Application(__name__)
                self.app.test_client_class = FlaskJsonClient
                
            def testCreateUser(self):
                with self.app.test_client() as c:
                    rv = c.post('/user/', json={'name': 'kolypto'})
                    # rv is JsonResponse
                    rv.status_code
                    rv.get_json()['user']  # Long form for the previous
                    rv['user']  # Shortcut for the previous
        ```
        
        
        
        
        
        Formatting Utils
        ================
        
        DynamicJSONEncoder
        -----------
        
        In python, de-facto standard for encoding objects of custom classes is the `__json__()` method which returns 
        the representation of the object.
        
        `DynamicJSONEncoder` is the implementation of this protocol: if an object has the `__json__()` method, its result if used for
        the representation.
        
        You'll definitely want to subclass it to support other types, e.g. dates and times:
        
        ```python
        from flask.ext.jsontools import DynamicJSONEncoder
        
        class ApiJSONEncoder(DynamicJSONEncoder):
            def default(self, o):
                # Custom formats
                if isinstance(o, datetime.datetime):
                    return o.isoformat(' ')
                if isinstance(o, datetime.date):
                    return o.isoformat()
                if isinstance(o, set):
                    return list(o)
                
                # Fallback
                return super(ApiJSONEncoder, self).default(o)
        ```
        
        Now, just install the encoder to your Flask:
        
        ```python
        from flask import Flask
        
        app = Flask(__name__)
        app.json_encoder = DynamicJSONEncoder
        ```
        
        
        
        JsonSerializableBase
        --------------------
        
        Serializing SqlAlchemy models to JSON is a headache: if an attribute is present on an instance, this does not mean
        it's loaded from the database.
        
        `JsonSerializableBase` is a mixin for SqlAlchemy Declarative Base that adds a magic `__json__()` method, compatible with
        [`DynamicJSONEncoder`](#dynamicjsonencoder). When serializing, it makes sure that entity serialization will *never* issue additional requests.
        
        Example:
        
        ```python
        from sqlalchemy.ext.declarative import declarative_base
        from flask.ext.jsontools import JsonSerializableBase
        
        Base = declarative_base(cls=(JsonSerializableBase,))
        
        class User(Base):
            #...
        ```
        
        Now, you can safely respond with SqlAlchemy models in your JSON views, and jsontools will handle the rest :)
        
        
        
        
        
        
        Class-Based Views
        =================
        
        Module `flask.ext.jsontools.views` contains a couple of classes that allow to build class-based views
        which dispatch to different methods.
        
        In contrast to [MethodView](http://flask.pocoo.org/docs/api/#flask.views.MethodView), this gives much higher flexibility.
        
        MethodView
        ----------
        
        Using `MethodView` class for methods, decorate them with `@methodview()`, which takes the following arguments:
        
        * `methods=()`: Iterable of HTTP methods to use with this method.
        * `ifnset=None`: Conditional matching. List of route parameter names that should *not* be set for this method to match.
        * `ifset=None`: Conditional matching. List of route parameter names that should be set for this method to match.
        
        This allows to map HTTP methods to class methods, and in addition define when individual methods should match.
        
        Quick example:
        
        ```python
        from flask.ext.jsontools import jsonapi, MethodView, methodview
        
        class UserView(MethodView):
            # Canonical way to specify decorators for class-based views
            decorators = (jsonapi, )
        
            @methodview
            def list(self):
                """ List users """
                return db.query(User).all()
               
            @methodview
            def get(self, user_id):
                """ Load a user by id """
                return db.query(User).get(user_id)
        
        userview = CrudView.as_view('user')
        app.add_url_rule('/user/', view_func=userview)
        app.add_url_rule('/user/<int:user_id>', view_func=userview)
        ```
        
        Now, `GET` HTTP method is routed to two different methods depending on conditions.
        Keep defining more methods to get good routing :)
        
        To simplify the last step of creating the view, there's a helper:
        
        ```python
        UserView.route_as_view(app, 'user', ('/user/', '/user/<int:user_id>'))
        ```
        
        RestfulView
        -----------
        
        Since `MethodView` is mostly useful to expose APIs over collections of entities, there is a RESTful helper which
        automatically decorates some special methods with `@methodview`.
        
        | View method | HTTP method | URL     |
        |-------------|-------------|---------|
        | list()      | GET         | `/`     |
        | create()    | POST        | `/`     |
        | get()       | GET         | `/<pk>` |
        | replace()   | PUT         | `/<pk>` |
        | update()    | POST        | `/<pk>` |
        | delete()    | DELETE      | `/<pk>` |
        
        By subclassing `RestfulView` and implementing some of these methods, 
        you'll get a complete API endpoint with a single class.
        
        It's also required to define the list of primary key fields by defining the `primary_key` property:
        
        ```python
        from flask.ext.jsontools import jsonapi, RestfulView
        
        class User(RestfulView):
            decorators = (jsonapi, )
            primary_key = ('id',)
            
            #region Operation on the collection
            
            def list():
                return db.query(User).all()
            
            def create():
                db.save(user)
                return user
                
            #endregion
            
            #region Operation on entities
            
            def get(id):
                return db.query(User).get(id)
            
            def replace(id):
                db.save(user, id)
            
            def update(id):
                db.save(user)
               
            def delete(id):
                db.delete(user)
            
            #endregion
        ```
        
        When a class like this is defined, its metaclass goes through the methods and decorates them with `@methodview`.
        This way, `list()` gets `@methodview('GET', ifnset=('id',))`, and `get()` gets `@methodview('GET', ifset=('id',))`.
        
Keywords: flask,json
Platform: any
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Description-Content-Type: text/markdown
