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Generates controller, views, and context for a JSON resource.

    mix phx.gen.json Accounts User users name:string age:integer

The first argument is the context module followed by the schema module
and its plural name (used as the schema table name).

The context is an Elixir module that serves as an API boundary for
the given resource. A context often holds many related resources.
Therefore, if the context already exists, it will be augmented with
functions for the given resource.

> Note: A resource may also be split
> over distinct contexts (such as `Accounts.User` and `Payments.User`).

The schema is responsible for mapping the database fields into an
Elixir struct.

Overall, this generator will add the following files to `lib/`:

  * a context module in `lib/app/accounts/accounts.ex` for the accounts API
  * a schema in `lib/app/accounts/user.ex`, with an `users` table
  * a view in `lib/app_web/views/user_view.ex`
  * a controller in `lib/app_web/controllers/user_controller.ex`

A migration file for the repository and test files for the context and
controller features will also be generated.

The location of the web files (controllers, views, templates, etc) in an
umbrella application will vary based on the `:context_app` config located
in your applications `:generators` configuration. When set, the Phoenix
generators will generate web files directly in your lib and test folders
since the application is assumed to be isolated to web specific functionality.
If `:context_app` is not set, the generators will place web related lib
and test files in a `web/` directory since the application is assumed
to be handling both web and domain specific functionality.
Example configuration:

    config :my_app_web, :generators, context_app: :my_app

Alternatively, the `--context-app` option may be supplied to the generator:

    mix phx.gen.json Sales User users --context-app warehouse

## Web namespace

By default, the controller and view will be namespaced by the schema name.
You can customize the web module namespace by passing the `--web` flag with a
module name, for example:

    mix phx.gen.json Sales User users --web Sales

Which would generate a `lib/app_web/controllers/sales/user_controller.ex` and

## Generating without a schema or context file

In some cases, you may wish to bootstrap JSON views, controllers, and
controller tests, but leave internal implementation of the context or schema
to yourself. You can use the `--no-context` and `--no-schema` flags for
file generation control.

## table

By default, the table name for the migration and schema will be
the plural name provided for the resource. To customize this value,
a `--table` option may be provided. For example:

    mix phx.gen.json Accounts User users --table cms_users

## binary_id

Generated migration can use `binary_id` for schema's primary key
and its references with option `--binary-id`.

## Default options

This generator uses default options provided in the `:generators`
configuration of your application. These are the defaults:

    config :your_app, :generators,
      migration: true,
      binary_id: false,
      sample_binary_id: "11111111-1111-1111-1111-111111111111"

You can override those options per invocation by providing corresponding
switches, e.g. `--no-binary-id` to use normal ids despite the default
configuration or `--migration` to force generation of the migration.

Read the documentation for `phx.gen.schema` for more information on
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