[SOLVED] how to display sub-tasks based on a condition

how to display sub-tasks based on a condition

so what i want in general is to display tasks and only display the subtasks if the display_under_tasks is true of the selected project not all the projects

in odoo in the project model when i choose a project you can see project's tasks with this domain

('display_project_id', '=', active_id),

but i want to display the sub tasks too based on a field called display_under_tasks if it's true then i'll display them if not i won't, but when i add this

'(parent_id', '!=', False),
 ('project_id.display_under_tasks', '=', True)

to the domain everything goes messy

i almost found a solution i guess

[('parent_id','!=',False),'|',('display_project_id', '=', active_id), 
 ('project_id.display_under_tasks', '=', True)],

with this domain it gives me the sub tasks based on the display_under_tasks field if it's true if not then it won't but i gives me all the tasks of all the project but i want only the tasks of the project i am in and when i did this

('parent_id','!=',False),
        '|',
        ('parent_id','=',False),
        ('display_project_id', '=', active_id),
        '&amp;',
        ('project_id.display_under_tasks', '=', True),
        ('project_id', '=', active_id)

the normal tasks are not showed only the subtasks are displayed

this is the whole code

 <record id="project.act_project_project_2_project_task_all" model="ir.actions.act_window">
    <field name="name">Tasks</field>
    <field name="res_model">project.task</field>
    <field name="view_mode">kanban,tree,form,calendar,pivot,graph,activity</field>
    <field name="domain">[('parent_id','!=',False),
        '|',
        ('parent_id','=',False),
        ('display_project_id', '=', active_id),
        '&amp;',
        ('project_id.display_under_tasks', '=', True),
        ('project_id', '=', active_id)]
    </field>
    <field name="context">{ 'default_project_id': active_id, 'show_project_update': True }</field>
    <field name="search_view_id" ref="project.view_task_search_form"/>
    <field name="help" type="html">
        <p class="o_view_nocontent_smiling_face">
            No tasks found. Let's create one!
        </p>
        <p>
            Keep track of the progress of your tasks from creation to completion.
            <br/>
            Collaborate efficiently by chatting in real-time or via email.
        </p>
    </field>
</record>

Solution

so here's what i've done

Removed display_under_tasks field from the project.task model.
Referenced the display_under_tasks field from the project.project model directly in the action domain.

Here's the code snippet for the action where tasks are always displayed, and subtasks are conditionally displayed:

<record id="action_task" model="ir.actions.act_window">
<field name="name">Tasks</field>
<field name="res_model">project.task</field>
<field name="view_mode">tree,form</field>
<field name="domain">
    [('project_id', '=', active_id),
     '|',
     ('parent_id', '=', False),
     '&', ('project_id.display_under_tasks', '=', True), ('parent_id', '!=', False)]
</field>