I have created a new tree View.

I need to update price with selected records based on user input .

My code :

<record id="view_pricelist_upgrade" model="ir.ui.view">    

       <field name="name">priclist upgrade</field>    

        <field name="model">pricelist.upgrade</field>       

     <field name="arch" type="xml">     

           <form string="Upgrade Price" create="false" edit="false">        

            <group>                        <group>                 

           <field name="level_of_price"/>                  

           <field name="upgrade_price"/>              

                 <button string='update_price' name="mass_update_price" class="btn-default"/>             

                     </group> </group>                 

                 <footer> <button string='Validate' name="mass_update_price" type="object"/>          

                                     <button string="Cancel" class="btn-default" special="cancel" />    

                </footer>

              </form>          

  </field>       

</record>               

    <record id="action_pricelist_upgrade" model="ir.actions.act_window">       

        <field name="name">Pricelist upgrade</field>       

        <field name="res_model">pricelist.upgrade</field>    

        <field name="view_type">form</field>         

        <field name="view_mode">form</field>       

         <field name="view_id" ref="view_pricelist_upgrade"/>   

         <field name="context">{'default_pricelist_ids': [(0, active_id, None)]}</field>   

         <field name="target">new</field>      

  </record>                     

                     <act_window        

                id="action_pricelist_upgrade"    

                name="Upgrade Pricelist"         

               res_model="pricelist.upgrade"      

              src_model="product.pricelist.item"      

              view_mode="form"          

               multi="True"                     

              key2="client_action_multi"        />

I'm getting the popup in form view when click on "Validate" button it call only create not my action

python file

class Pricelist_Upgrade(models.AbstractModel):
    _name = 'pricelist.upgrade'   

    _auto = False

@api.multi   

def mass_update_price(self, vals):

  ### some

   return  {'type': 'ir.actions.act_window_close'}