Retrieve all renderers being used by ColumnDataSource (on python side)

[gmerritt123]

Simplest MRE:

from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.io import curdoc # maybe i need this?

src = ColumnDataSource(data={'x':[1,2,3],'y':[1,2,3]})

f=figure()
r1 = f.scatter(x='x',y='y',source=src)
r2 = f.line(x='x',y='y',source=src)

Here I have 2 renderers being driven by the same CDS. I’m wondering if there’s a way to retrieve these renderers from the CDS on the python side. In my far more involved use case, the CDS (actually multiple CDS’s) are being held in a class instance, but I’m trying to keep the renderers “free” from my class and instead be up to the user. However if I want to add a filter… I need to instantiate a CDSView and add that view to all renderers that are being driven by each CDS.

So my hope is something like:

# where self already has a "source_dict" that contains a bunch of CDS models
def addFilter(self,filter_specs):
    fi = filter_specs #...make the filter based on args provided
    view = CDSView(filters=[fi])
    for src in source_dict.values():
        rends = ???? #... magically find all the renderers currently instantiated by user that are being driven by src
        for r in rends:
            rends.view=view

Thanks…

[Bryan]

There’s not any back-references from data sources to renderers that use the sources, so there are not any magic options besides the standard two:

• search all the models looking for renderers with the data source in question
• manually keep track of renderers that add a given data source up front

You could also combine the two approaches, e.g. set a specific name property value when you add the renderer with the data source, then take advantage of Bokeh APIs like plot.select to search for every model with that name.

[gmerritt123]

Thanks for reply.

• search all the models looking for renderers with the data source in question

How do I do this? I know about Bokeh.index[Object.keys(Bokeh.index)[0]] on the JS side but not python side.

[Bryan]

In recent versions, Document.models is a DocumentModelManager object that you can iterate over (e.g. for m in doc.models)