Graph and pivot views

Graph views provide a graphical view of the data, in the form of a chart. The current fields available in the To-do Tasks are not good candidates for a chart, so we will add one to use on such a view.

In the TodoTask class, at the todo_ui/models/todo_model.py file, add:

effort_estimate = fields.Integer('Effort Estimate') 

It also needs to be added to the To-do Task form, so that we can add values for it on the existing records, and are able to check this new view.

Now let's add the To-Do Tasks graph view:

<record id="view_graph_todo_task" model="ir.ui.view"> 
  <field name="model">todo.task</field> 
    <field name="arch" type="xml"> 
      <graph type="bar"> 
        <field name="stage_id" /> 
        <field name="effort_estimate" type="measure" /> 
      </graph> 
    </field> 
</record> 

The graph view element can have a type attribute that can be set to bar...