backbone.js - Backbone Marionette: CompositeView replacing items instead of appending them -

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i've got marionette compositeview i'm using fill in dropdown. json response clean when call collection.fetch() within compositeview, instead of appending new itemviews, compositeview seems replacing them in dom.

here's code (coffeescript):

class @pdcollectionitemview extends backbone.marionette.itemview     el: 'li'     template: handlebars.compile('{{ title }}')  class @pdcollectionsview extends backbone.marionette.compositeview     id: 'pd_collections'     classname: 'selection'     itemview: pdcollectionitemview     itemviewcontainer: '.scroll ul'     template: handlebarstemplates['connections/collection_select'] #handlebars_assets gem      ui:         modaltrigger: '#pd_collection_selector'         modal : '#pd_selection_modal'         selectbtn : '#select_collection'      initialize: ->         @selectedcollection = undefined         connectors.app.vent.on "connections:collectionstaged", @assignselectedcollection  return @pdcollectionsview

and parent layout fetch called:

class @indexlayout extends backbone.marionette.layout     initialize: ->         @collections = new pdcollectionscollection         @collectionsview = new pdcollectionsview             collection: @collections      onrender: ->         @collectionselect.show @collectionsview          @collections.fetch             success: (collection, response, options) =>                 connectors.app.vent.trigger "connections:collectionsloaded"                 connectors.app.vent.trigger "loadcomplete"              error: (collection, response, options) =>                 console.log response

i've tried manually appending items appendhtml call, same behavior. can log each itemview call onafteritemadded on @pdcollectionsview, , item views are distinct; different cids, , appropriate models.

i think problem in use of backbone's fetch operation. fetch "syncs" collection state on server. without specifying customization intelligently add new items, update changed items, , remove items no longer on server. i'm guessing if examine collection after call fetch you'll see it's got items being rendered in compositeview.

you can modify fetch's behavior sync server without removing passing {remove: false}. should yield results you're looking for:

    @collections.fetch         remove: false          success: (collection, response, options) =>             connectors.app.vent.trigger "connections:collectionsloaded"             connectors.app.vent.trigger "loadcomplete"          error: (collection, response, options) =>             console.log response

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