added docs for setting up ember for nested resources with the json api adapter

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fix intra-document links

fix spelling error in nested resources toc link

add example for post collection

Update ember-and-json-api.md

fix typo
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- [How to add root key](howto/add_root_key.md) - [How to add root key](howto/add_root_key.md)
- [How to add pagination links](howto/add_pagination_links.md) - [How to add pagination links](howto/add_pagination_links.md)
- [Using AMS Outside Of Controllers](howto/outside_controller_use.md) - [Using AMS Outside Of Controllers](howto/outside_controller_use.md)
- [How to use JSON API with Ember](howto/ember-and-json-api.md)
## Getting Help ## Getting Help

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# How to use JSON API Query Parameters with Ember
- [Preparation](./ember-and-json-api.md#preparation)
- [Adapter Changes](./ember-and-json-api.md#adapter-changes)
- [Serializer Changes](./ember-and-json-api.md#serializer-changes)
- [Including Nested Resources](./ember-and-json-api.md#including-nested-resources)
## Preparation
Note: This guide assumes that `ember-cli` is used for your ember app.
The JSON API specification calls for hyphens for multi-word separators. AMS uses underscores.
To solve this, in Ember, both the adapter and the serializer will need some modifications:
### Adapter Changes
```javascript
// app/adapters/application.js
import DS from 'ember-data';
import ENV from "../config/environment";
export default DS.JSONAPIAdapter.extend({
namespace: 'api',
// if your rails app is on a different port from your ember app
// this can be helpful for development.
// in production, the host for both rails and ember should be the same.
host: ENV.host,
// allows the multiword paths in urls to be underscored
pathForType: function(type) {
let underscored = Ember.String.underscore(type);
return Ember.String.pluralize(underscored);
},
// allows queries to be sent along with a findRecord
// hopefully Ember / EmberData will soon have this built in
urlForFindRecord(id, modelName, snapshot) {
let url = this._super(...arguments);
let query = Ember.get(snapshot, 'adapterOptions.query');
if(query) {
url += '?' + Ember.$.param(query);
}
return url;
}
});
```
### Serializer Changes
```javascript
// app/serializers/application.js
import Ember from 'ember';
import DS from 'ember-data';
var underscore = Ember.String.underscore;
export default DS.JSONAPISerializer.extend({
keyForAttribute: function(attr) {
return underscore(attr);
},
keyForRelationship: function(rawKey) {
return underscore(rawKey);
}
});
```
## Including Nested Resources
Previously, `store.find` and `store.findRecord` did not allow specification of any query params.
The AMS default for the `include` parameter is to be `nil` meaning that if any associations are defined in your serializer, only the `id` and `type` will be in the `relationships` structure of the JSON API response.
For more on `include` usage, see: [The JSON API include examples](./../general/adapters.md#JSON-API)
With the above modifications, you can execute code as below in order to include nested resources while doing a find query.
```javascript
store.findRecord('post', postId, { adapterOptions: { query: { include: 'comments' } } });
```
will generate the path `/posts/{postId}?include='comments'`
So then in your controller, you'll want to be sure to have something like:
```ruby
render json: @post, include: params[:include]
```
If you want to use `include` on a collection, you'd write something like this:
```javascript
store.query('post', { include: 'comments' });
```
which will generate the path `/posts?include='comments'`