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CommandableMixin

Provides support for the setting commands URL query parameter as introduced by the api/v1/nodes/:id/nodes (V1) resource.

Server responses can contain permitted actions to be able to support enabling and disabling in the corresponding UI; how many and which ones should be checked by the server can be specified.

How to apply the mixin to a model​

var MyModel = Backbone.Model.extend({

  constructor: function MyModel(attributes, options) {
    Backbone.Model.prototype.constructor.apply(this, arguments);
    this
      .makeConnectable(options)
      .makeCommandable(options);
  },

  url: function () {
    var url = Url.combine(this.connector.connection.url, 'myresource'),
        query = Url.combineQueryString(
          this.getRequestedCommandsUrlQuery()
        );
    return query ? url + '?' + query : url;
  }

});

ConnectableMixin.mixin(MyModel.prototype);
CommandableMixin.mixin(MyModel.prototype);

This mixin us usually combined together with the ConnectableMixin or with another cumulated mixin which includes it.

How to use the mixin​

Set up the URL parameters by calling setCommands and resetCommands and fetch the model:

// Set the commands for requesting when creating the model
var model = new MyModel(undefined, {
      connector: connector,
      commands: ['delete', 'reserve']
    });
model.fetch();

// Set the commands for requesting after creating the model
model.setCommands(['delete', 'reserve']);
model.fetch();

makeCommandable(options) : this​

Must be called in the constructor to initialize the mixin functionality. Expects the Backbone.Model or Backbone.Collection constructor options passed in.

Recognized option properties:

commands : One or more command signatures to be requested for being checked. The value is handled the same way as the setCommands method does it. An empty array is the default.

commands​

Command signatures to be requested for being checked (array of strings, empty by default, read-only).

setCommands(names) : void​

Asks for one or more commands to be checked. The names parameter can be either string, or an array of strings. The string can contain a comma-delimited list, in which case it will be split to an array.

// Have two commands checked, option 1
model.setCommands(['delete', 'reserve']);
// Have two commands checked, option 2
model.setCommands('delete');
model.setCommands('reserve');
// Have two commands checked, option 3
model.setCommands('delete,reserve');

resetCommands(names) : void​

Prevents one or more commands from being checked. The names parameter can be either string, or an array of strings, or nothing. The string can contain a comma-delimited list, in which case it will be split to an array. If nothing is specified, all commands will be removed (not to be checked).

// Cancel all command checks and fetch the fresh data
model.resetCommands();
model.fetch();

getRequestedCommandsUrlQuery() : string​

Formats the URL query parameters for the command investigation. They can be concatenated with other URL query parts (both object literals and strings) by Url.combineQueryString.

var url = ...,
    query = Url.combineQueryString(
      ...,
      this.getRequestedCommandsUrlQuery()
    );
if (query) {
  url = Url.appendQuery(url, query);
}

See Also​

ConnectableMixin