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And this example shows how to read samples that contain optional members:

An optional member of type T in a DDS type maps to the value-type dds::core::optional<T> in the modern C++ API.

This type maps to this C++ class:

By default optional members are unset ( dds::core::optional<T>::is_set() is false ). To set an optional member, simply assign a value; to reset it use reset() or assign a default-constructed optional<T>:

To get the value by reference, use get():

Note that dds::core::optional manages the creation, assignment and destruction of the contained value, so unlike the traditional C++ API you don't need to reserve and release a pointer.

Optional members have the same mapping to Java class members as non-optional members, except that null is a valid value for an optional member. Primitive types map to their corresponding Java wrapper classes (to allow nullifying).

Generated Java classes also include a clear() method that resets all optional members to null.

This type maps to this Java class:

An optional member is set when it points to an object and is unset when it is null.

The following code shows several examples on how to set and unset optional members when writing samples:

This version of Connext DDS supports a pre-standard version of DynamicData (see Kappa Tasu Footwear Women Synthetic Women’s LowTop Sneakers Blue 6721 Navy/Rosé YzIlB
). However it does support optional members.

Any optional member can be set with the regular setter methods in the DynamicData API, such as DDS_DynamicData::set_long() . An optional member is considered unset until a value is explicitly assigned using a ‘set’ operation.

To unset a member, use DDS_DynamicData::clear_optional_member() .

The C and C++ ‘get’ operations, such as DDS_DynamicData::get_long() , return DDS_RETCODE_NO_DATA when an optional member is unset; in Java, the ‘get’ methods throw a RETCODE_NO_DATA exception.

The following C++ example shows how to set and unset optional members before writing a sample. The example uses the same type (MyType) as in previous sections. This example assumes you already know how to use the DynamicData API, in particular how to create a DynamicDataTypeSupport and a DynamicData topic. More information and examples are available in the API Reference HTML documentation (select Modules, RTI Connext DDS API Reference, Topic Module, Dynamic Data ).

In this example we read samples that contain optional members:

SQL filter expressions used in ContentFilteredTopics and QueryConditions (see Nike Men’s Hypervenomx Phade III Tf Footbal Shoes Green Electric Green/Blackhyper Orangevolt kxODe
in this document and Section 4.6.7 (ReadConditions and QueryConditions) and Section 5.4 (ContentFilteredTopics) in the User’s Manual ) can refer to optional members. The syntax is the same as for any other member.


Add a namespace on which models and collections are defined. This is especially useful when working in an environment without a shared global scope (like is in a browser), where you'll need to tell the where your models are defined, so it can resolve them to create and maintain relations.

Remove a scope. This allows you to remove a scope you added previously, or to remove the default 'global' scope ( in the browser) scope to prevent Backbone-relational from resolving objects on it.

Reset the to its original state. This will disable relations for all models created up to this point, remove added model scopes, and removed all internal store collections.

Unregister a single model or a collection. Unregistering a model will remove a model from any relations it's involved in. Internally, unregister is called when a model has been destroyed. It can also be called explicitly to on models you don't want Backbone-relational to consider for relations anymore, for example to free up models used as (temporary) search results.

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A basic working example to get you started:

This is achieved using the following relations and models:

The original version of Backbone-relational! This already contained much of the basics: and relations (including ), and .

Each registers itself with upon creation, and is removed from the when destroyed. When creating or updating an attribute that is a key in a relation, removed related objects are notified of their removal, and new related objects are looked up in the Store.


Backbone-relational only allows the existence of one model instance for each model type . This check is there to enforce there will only be one version of a model with a certain id at any given time (which is also the reason for the existence of Backbone.Relational.Store). This is necessary to enforce consistency and integrity of relations.

If multiple versions were allowed, inadvertently manipulating or performing a save or destroy on another version of that model (which is still around on the client, and can for example still be bound to one or more views in your application, either on purpose or inadvertently) would save its state to the server, killing its relations, and the server response would set the same (incorrect) data on the 'current' version of the model on the client. By then, you'd be in trouble.

Therefore, Backbone-relational simply does not allow this situation to occur. This is much safer than putting the burden on the developer to always make sure every older version of a model is completely decoupled from every other part of your application. It might be annoying to get an error every now and then, and sometimes inconvenient to have to use the factory method , but it's much better than subtle bugs that can lead to major data loss later on in the life cycle of your application.

A boolean or an object. Default: .

If this property is set to , when a model is instantiated the related model is automatically fetched using Imac Womens Jenny Court Shoes Grey 3GvSytA
. The value of the property can also be an object. In that case the object is passed to Womens ladies stiletto high heel barely there double strap buckle party sandals shoes size Cobalt Blue Suede OhcE1A
as the options parameter.

Note that operates independently from other `fetch` operations, including those that may have fetched the current model.

A string that can be resolved to an object type on the global scope, or a reference to a Backbone.Collection type.


Determine the type of collections used for a HasMany relation. If you define a url(models<Backbone.Model[]>) function on the specified collection, this enables to fetch all missing models in one request, instead of firing a separate request for each.

A string or a boolean. Default: .

Used to create a back reference from the Backbone.Collection used for a HasMany relation to the model on the other side of this relation. By default, the relation's key attribute will be used to create a reference to the RelationalModel instance from the generated collection. If you set to a string, it will use that string as the reference to the RelationalModel, rather than the relation's key attribute. If you don't want this behavior at all, set to (or any falsy value) and this reference will not be created.

An options hash, or a function that accepts an instance of a Backbone.RelationalModel and returns an options hash.

Used to provide options for the initialization of the collection in the 'Many'-end of a HasMany relation. Can be an options hash or a function that should take the instance in the 'One'-end of the 'HasMany' relation and return an options hash.

A boolean. Default: .

Specifies whether models will be created from nested objects or not.

A string that references an attribute to deserialize data for Chic Feet Womens Satin Closed Toe Wedding Bridal Bridesmaid Prom Party Mary Jane Style Low Heel Shoes 38 Navy Blue Ko7KVuQbT0

Used to override key when determining what data to use when (de)serializing a relation, since the data backing your relations may use different naming conventions. For example, a Rails backend may provide the keys suffixed with or . The behavior for corresponds to the following rules:

When a relation is instantiated, the contents of the are used as its initial data. The application uses the regular key attribute to interface with the relation and the models in it; the is not available as an attribute for the model. So you may be provided with data containing , while you want to access this relation as .

Note that setting will set GEERBU Womens Martin Black Winter Boots Suede Ankle Boots Ladies Flat Boots Brown vSDRPJ340
to the same value, if it isn't specified itself. This means that when saving zoo, the animals attribute will be serialized back into the key.

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