Dictionary of ColumnDataSource in bokeh-server

Hello,

I’m trying to create an app on bokeh-server, where I need

to create a dict (or list) of ColumnDataSource instances.

#Data sources

sData = dict()

for Id in Data:

sData[Id] = Instance(ColumnDataSource)

``

I’ve used a https://github.com/bokeh/bokeh/tree/master/examples/app/stock_applet example as a basis.

After class initialization the make_source() method is executed.

Then I’m trying to catch a selection event:

def setup_events(self):

super(my_app, self).setup_events()

for Id in self.Data:

if self.sData[Id]:

self.sData[Id].on_change(‘selected’, self, ‘selection_change’)

``

But there is an error:

AttributeError: ‘Instance’ object has no attribute ‘on_change’

Is it possible to trig events from dictionary of ColumnDataSource and what I’m doing wrong?

You will need to provide more context. "Instance" is a Bokeh models property, and is typically only used and useful as a class attribute, but it looks like you are trying to use it outside a class definition here? If not, and you are trying to define a dict of ColumnDataSources on an app class, you will need to use the Bokeh Dict property, instead of the standard python dict.

class StockApp(VBox):

    sData = Dict(String, ColumnDataSource) # or whatever key property type you want

It has to be Bokeh properties "all the way through" so that the model can properly validate and serialize itself.

Bryan