Class JSONSerializer

Extends:	Serializer
Defined in:	../serializer/addon/json.js:17
Module:	@ember-data/serializer

extractAttributes (modelClass, resourceHash) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:572

modelClass: Object
resourceHash: Object
returns: Object

Returns the resource's attributes formatted as a JSON-API "attributes object".

http://jsonapi.org/format/#document-resource-object-attributes

extractErrors (store, typeClass, payload, id) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1303

store: Store
typeClass: Model
payload: Object
id: (String|Number)
returns: Object; json The deserialized errors

extractErrors is used to extract model errors when a call to Model#save fails with an InvalidError. By default Ember Data expects error information to be located on the errors property of the payload object.

This serializer expects this errors object to be an Array similar to the following, compliant with the https://jsonapi.org/format/#errors specification:

{
  "errors": [
    {
      "detail": "This username is already taken!",
      "source": {
        "pointer": "data/attributes/username"
      }
    }, {
      "detail": "Doesn't look like a valid email.",
      "source": {
        "pointer": "data/attributes/email"
      }
    }
  ]
}

The key detail provides a textual description of the problem. Alternatively, the key title can be used for the same purpose.

The nested keys source.pointer detail which specific element of the request data was invalid.

Note that JSON-API also allows for object-level errors to be placed in an object with pointer data, signifying that the problem cannot be traced to a specific attribute:

{
  "errors": [
    {
      "detail": "Some generic non property error message",
      "source": {
        "pointer": "data"
      }
    }
  ]
}

When turn into a Errors object, you can read these errors through the property base:

{{#each @model.errors.base as |error|}}
  <div class="error">
    {{error.message}}
  </div>
{{/each}}

Example of alternative implementation, overriding the default behavior to deal with a different format of errors:

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  extractErrors(store, typeClass, payload, id) {
    if (payload && typeof payload === 'object' && payload._problems) {
      payload = payload._problems;
      this.normalizeErrors(typeClass, payload);
    }
    return payload;
  }
}

extractId (modelClass, resourceHash) String

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:558

modelClass: Object
resourceHash: Object
returns: String

Returns the resource's ID.

extractMeta (store, modelClass, payload)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1269

store: Store
modelClass: Model
payload: Object

extractMeta is used to deserialize any meta information in the adapter payload. By default Ember Data expects meta information to be located on the meta property of the payload object.

Example

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  extractMeta(store, typeClass, payload) {
    if (payload && payload.hasOwnProperty('_pagination')) {
      let meta = payload._pagination;
      delete payload._pagination;
      return meta;
    }
  }
}

extractPolymorphicRelationship (relationshipModelName, relationshipHash, relationshipOptions) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:630

relationshipModelName: Object
relationshipHash: Object
relationshipOptions: Object
returns: Object

Returns a polymorphic relationship formatted as a JSON-API "relationship object".

http://jsonapi.org/format/#document-resource-object-relationships

relationshipOptions is a hash which contains more information about the polymorphic relationship which should be extracted:

resourceHash complete hash of the resource the relationship should be extracted from
relationshipKey key under which the value for the relationship is extracted from the resourceHash
relationshipMeta meta information about the relationship

extractRelationship (relationshipModelName, relationshipHash) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:596

relationshipModelName: Object
relationshipHash: Object
returns: Object

Returns a relationship formatted as a JSON-API "relationship object".

http://jsonapi.org/format/#document-resource-object-relationships

extractRelationships (modelClass, resourceHash) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:653

modelClass: Object
resourceHash: Object
returns: Object

Returns the resource's relationships formatted as a JSON-API "relationships object".

http://jsonapi.org/format/#document-resource-object-relationships

keyForAttribute (key, method) String

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1414

key: String
method: String
returns: String; normalized key

keyForAttribute can be used to define rules for how to convert an attribute name in your model to a key in your JSON.

Example

app/serializers/application.js

import JSONSerializer from '@ember-data/serializer/json';
import { underscore } from '@ember/string';

export default class ApplicationSerializer extends JSONSerializer {
  keyForAttribute(attr, method) {
    return underscore(attr).toUpperCase();
  }
}

keyForLink (key, kind) String

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1468

key: String
kind: String; `belongsTo` or `hasMany`
returns: String; normalized key

keyForLink can be used to define a custom key when deserializing link properties.

keyForRelationship (key, typeClass, method) String

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1440

key: String
typeClass: String
method: String
returns: String; normalized key

keyForRelationship can be used to define a custom key when serializing and deserializing relationship properties. By default JSONSerializer does not provide an implementation of this method.

Example

app/serializers/post.js

  import JSONSerializer from '@ember-data/serializer/json';
  import { underscore } from '@ember/string';

  export default class PostSerializer extends JSONSerializer {
    keyForRelationship(key, relationship, method) {
      return `rel_${underscore(key)}`;
    }
  }

modelNameFromPayloadKey (key) String

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:724

key: String
returns: String; the model's modelName

normalize (typeClass, hash) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:495

typeClass: Model
hash: Object
returns: Object

Normalizes a part of the JSON payload returned by the server. You should override this method, munge the hash and call super if you have generic normalization to do.

It takes the type of the record that is being normalized (as a Model class), the property where the hash was originally found, and the hash to normalize.

You can use this method, for example, to normalize underscored keys to camelized or other general-purpose normalizations.

Example

app/serializers/application.js

import JSONSerializer from '@ember-data/serializer/json';
import { underscore } from '@ember/string';
import { get } from '@ember/object';

export default class ApplicationSerializer extends JSONSerializer {
  normalize(typeClass, hash) {
    let fields = get(typeClass, 'fields');

    fields.forEach(function(type, field) {
      let payloadField = underscore(field);
      if (field === payloadField) { return; }

      hash[field] = hash[payloadField];
      delete hash[payloadField];
    });

    return this._super.apply(this, arguments);
  }
}

normalizeArrayResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:432

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeCreateRecordResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:362

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeDeleteRecordResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:376

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeFindAllResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:292

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeFindBelongsToResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:306

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeFindHasManyResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:320

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeFindManyResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:334

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeFindRecordResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:264

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeQueryRecordResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:278

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeQueryResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:348

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:204

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

The normalizeResponse method is used to normalize a payload from the server to a JSON-API Document.

http://jsonapi.org/format/#document-structure

This method delegates to a more specific normalize method based on the requestType.

To override this method with a custom one, make sure to call return this._super(store, primaryModelClass, payload, id, requestType) with your pre-processed data.

Here's an example of using normalizeResponse manually:

socket.on('message', function(message) {
  let data = message.data;
  let modelClass = store.modelFor(data.modelName);
  let serializer = store.serializerFor(data.modelName);
  let normalized = serializer.normalizeSingleResponse(store, modelClass, data, data.id);

  store.push(normalized);
});

normalizeSaveResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:404

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeSingleResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:418

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

normalizeUpdateRecordResponse (store, primaryModelClass, payload, id, requestType) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:390

Available since v1.13.0

store: Store
primaryModelClass: Model
payload: Object
id: String|Number
requestType: String
returns: Object; JSON-API Document

serialize (snapshot, options) Object

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:881

snapshot: Snapshot
options: Object
returns: Object; json

Called when a record is saved in order to convert the record into JSON.

By default, it creates a JSON object with a key for each attribute and belongsTo relationship.

For example, consider this model:

app/models/comment.js

import Model, { attr, belongsTo } from '@ember-data/model';

export default class CommentModel extends Model {
  @attr title;
  @attr body;

  @belongsTo('user') author;
}

The default serialization would create a JSON object like:

{
  "title": "Rails is unagi",
  "body": "Rails? Omakase? O_O",
  "author": 12
}

By default, attributes are passed through as-is, unless you specified an attribute type (attr('date')). If you specify a transform, the JavaScript value will be serialized when inserted into the JSON hash.

By default, belongs-to relationships are converted into IDs when inserted into the JSON hash.

IDs

serialize takes an options hash with a single option: includeId. If this option is true, serialize will, by default include the ID in the JSON object it builds.

The adapter passes in includeId: true when serializing a record for createRecord, but not for updateRecord.

Customization

Your server may expect a different JSON format than the built-in serialization format.

In that case, you can implement serialize yourself and return a JSON hash of your choosing.

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = {
      POST_TTL: snapshot.attr('title'),
      POST_BDY: snapshot.attr('body'),
      POST_CMS: snapshot.hasMany('comments', { ids: true })
    };

    if (options.includeId) {
      json.POST_ID_ = snapshot.id;
    }

    return json;
  }
}

Customizing an App-Wide Serializer

If you want to define a serializer for your entire application, you'll probably want to use eachAttribute and eachRelationship on the record.

app/serializers/application.js

import JSONSerializer from '@ember-data/serializer/json';
import { singularize } from 'ember-inflector';

export default class PostSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = {};

    snapshot.eachAttribute(function(name) {
      json[serverAttributeName(name)] = snapshot.attr(name);
    });

    snapshot.eachRelationship(function(name, relationship) {
      if (relationship.kind === 'hasMany') {
        json[serverHasManyName(name)] = snapshot.hasMany(name, { ids: true });
      }
    });

    if (options.includeId) {
      json.ID_ = snapshot.id;
    }

    return json;
  }
}

function serverAttributeName(attribute) {
  return attribute.underscore().toUpperCase();
}

function serverHasManyName(name) {
  return serverAttributeName(singularize(name)) + "_IDS";
}

This serializer will generate JSON that looks like this:

{
  "TITLE": "Rails is omakase",
  "BODY": "Yep. Omakase.",
  "COMMENT_IDS": [ 1, 2, 3 ]
}

Tweaking the Default JSON

If you just want to do some small tweaks on the default JSON, you can call super first and make the tweaks on the returned JSON.

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = this._super(...arguments);

    json.subject = json.title;
    delete json.title;

    return json;
  }
}

serializeAttribute (snapshot, json, key, attribute)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1090

snapshot: Snapshot
json: Object
key: String
attribute: Object

serializeAttribute can be used to customize how attr properties are serialized

For example if you wanted to ensure all your attributes were always serialized as properties on an attributes object you could write:

app/serializers/application.js

import JSONSerializer from '@ember-data/serializer/json';

export default class ApplicationSerializer extends JSONSerializer {
  serializeAttribute(snapshot, json, key, attributes) {
    json.attributes = json.attributes || {};
    this._super(snapshot, json.attributes, key, attributes);
  }
}

serializeBelongsTo (snapshot, json, relationship)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1136

snapshot: Snapshot
json: Object
relationship: Object

serializeBelongsTo can be used to customize how belongsTo properties are serialized.

Example

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';
import { isNone } from '@ember/utils';

export default class PostSerializer extends JSONSerializer {
  serializeBelongsTo(snapshot, json, relationship) {
    let key = relationship.key;
    let belongsTo = snapshot.belongsTo(key);

    key = this.keyForRelationship ? this.keyForRelationship(key, "belongsTo", "serialize") : key;

    json[key] = isNone(belongsTo) ? belongsTo : belongsTo.record.toJSON();
  }
}

serializeHasMany (snapshot, json, relationship)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1189

snapshot: Snapshot
json: Object
relationship: Object

serializeHasMany can be used to customize how hasMany properties are serialized.

Example

app/serializers/post.js

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serializeHasMany(snapshot, json, relationship) {
    let key = relationship.key;
    if (key === 'comments') {
      return;
    } else {
      this._super(...arguments);
    }
  }
}

serializeIntoHash (hash, typeClass, snapshot, options)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1058

hash: Object
typeClass: Model
snapshot: Snapshot
options: Object

You can use this method to customize how a serialized record is added to the complete JSON hash to be sent to the server. By default the JSON Serializer does not namespace the payload and just sends the raw serialized JSON object. If your server expects namespaced keys, you should consider using the RESTSerializer. Otherwise you can override this method to customize how the record is added to the hash. The hash property should be modified by reference.

For example, your server may expect underscored root objects.

app/serializers/application.js

import RESTSerializer from '@ember-data/serializer/rest';
import { decamelize } from '@ember/string';

export default class ApplicationSerializer extends RESTSerializer {
  serializeIntoHash(data, type, snapshot, options) {
    let root = decamelize(type.modelName);
    data[root] = this.serialize(snapshot, options);
  }
}

serializePolymorphicType (snapshot, json, relationship)

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:1234

snapshot: Snapshot
json: Object
relationship: Object

You can use this method to customize how polymorphic objects are serialized. Objects are considered to be polymorphic if { polymorphic: true } is pass as the second argument to the belongsTo function.

Example

app/serializers/comment.js

import JSONSerializer from '@ember-data/serializer/json';
import { isNone } from '@ember/utils';

export default class CommentSerializer extends JSONSerializer {
  serializePolymorphicType(snapshot, json, relationship) {
    let key = relationship.key;
    let belongsTo = snapshot.belongsTo(key);

    key = this.keyForAttribute ? this.keyForAttribute(key, 'serialize') : key;

    if (isNone(belongsTo)) {
      json[key + '_type'] = null;
    } else {
      json[key + '_type'] = belongsTo.modelName;
    }
  }
}

shouldSerializeHasMany (snapshot, key, relationshipType) Boolean

Module:	@ember-data/serializer

Defined in ../serializer/addon/json.js:860

snapshot: Snapshot
key: String
relationshipType: String
returns: Boolean; true if the hasMany relationship should be serialized

Check if the given hasMany relationship should be serialized

By default only many-to-many and many-to-none relationships are serialized. This could be configured per relationship by Serializer's attrs object.

© 2020 Yehuda Katz, Tom Dale and Ember.js contributors
Licensed under the MIT License.
https://api.emberjs.com/ember-data/3.25/classes/JSONSerializer/methods