I'm trying to implement a boat company module.

I have various boats, and each boat has model options, like engine names, etc.

In my sale.order module, I have extended the module to be able to enter boat name

In the Order Lines page of that form, I have an option to select the model options relevant to that boat name. And I'm trying to implement a search function that refines the results of that drop down to only the models of that particular boat's id we just selected above.

I wrote the function but it's not working for some reason. Can you please help me out?

Here are the relevant files:

XML:

<record id="sale_view_order_form" model="ir.ui.view">
            <field name="model">sale.order</field>
            <field name="inherit_id" ref="sale.view_order_form"/>
            <field name="arch" type="xml">
                <field name="partner_id" position="after">
                    <field name="boatmodel_id"/>            
                </field>
                <xpath expr="//field[@name='product_id']" position="attributes">
                    <attribute name="context">
                        {'boatmodel_id': parent.boatmodel_id}
                    </attribute>
                </xpath>
            </field>
        </record>

PY:

class product_template(osv.osv):
    _inherit="product.template"
    _columns={
              'boatlength':fields.char("Boat Length", size=18),
              'fuelcapacity':fields.char("Fuel Capacity", size=18),
              'modeloptions_id':fields.many2one("product.category","Model Options"),
              
              }
    
    def search(self, cr, uid, args, offset=0, limit=None, order=None, context=None, count=False):
        print("Hii Search has started")
        if context is None:
            print("Heloo context was none")
            context={}
        if context.get('boatmodel_id'):
            print("CONTEXT========")
            print context['boatmodel_id']
            #code to limit by category assigned to the boat model
            productobj=self.pool.get('product.template').read(cr, uid, context['boatmodel_id'],['modeloptions_id'])
            args=[('categ_id','=',productobj['modeloptions_id'][0])] + args
        return super(product_template, self).search(cr, uid, args, offset, limit, order, context=context, count=count)
            
                
class sale_order(osv.osv):
    _inherit="sale.order"
    _columns={
              'boatmodel_id':fields.many2one("product.template","Boat Model", domain=[('categ_id.name','=','Boat Models')]),
              
              }

Note:As you may have noticed, I have written print statements to test the outputs of the search function on the console. But nothing ever gets printed. I guess the search function never gets called. I'm using Odoo 8