I made 2 models and try to make relationships between them but hr table work fine and my student table won't show.

This how form looks:

https://ibb.co/dP4GmJ

This how hr shows:

https://ibb.co/fZ7afd

This how students shows (this is problem), no select student table?

https://ibb.co/cVFYYy

When i change relationship student_ids to many2many everything works well but i wanna one2many.

This is my code:

Also i am set 'depends': ['base', 'hr', 'students',], in study_room __openerp__.py

#student model
from openerp import models, fields, api

class students(models.Model):
    _name = 'students.students'


    name = fields.Char(string='First Name', required=True)
    last_name = fields.Char(string='Last Name', required=True)
    email = fields.Char(string='Email', required=True)
    phone = fields.Char(string='Phone')

    gender = fields.Selection([('m', 'Male'), ('f', 'Female')], string='Gender', default='m')
    is_active = fields.Boolean(string='Active', default=True)
    birth_date = fields.Date(string='Birth Date', default=fields.Date.today())

    room_id = fields.Many2one(comodel_name="study.room", string="Study Room", )

    _sql_constraints = [
        ('unique_email', 'unique(email)', 'User with that email already exist!')
    ]

#study room model
class study_room(models.Model):
    _name = 'study.room'

    @api.one
    @api.depends('student_ids')
    def _get_no_of_students(self):
        self.no_of_students = len(self.student_ids)

    name = fields.Char(string="Name")
    teacher_ids = fields.Many2many(string="Teachers", comodel_name="hr.employee", relation="room_teacher_rel",
                                   column1="room_id", column2="teacher_id")
    student_ids = fields.One2many(string="Students", comodel_name="students.students", inverse_name="room_id")
    no_of_students = fields.Integer(string="No. of Students", compute="_get_no_of_students")

#student view
<openerp>
    <data>
        <record id="student_form_view" model="ir.ui.view">
           <field name="name">Student Form View</field>
           <field name="model">students.students</field>
            <field name="arch" type="xml">
                <form string="Students">
                    <sheet>
                        <group>
                            <field name="name"/>
                            <field name="last_name"/>
                            <field name="email"/>
                            <field name="phone"/>
                            <field name="gender"/>
                            <field name="is_active"/>
                            <field name="birth_date"/>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>
        <record id="student_tree_view" model="ir.ui.view">
            <field name="name">Student Tree View</field>
            <field name="model">students.students</field>
            <field name="arch" type="xml">
                <tree string="Students">
                    <field name="name"/>
                    <field name="last_name"/>
                    <field name="birth_date"/>
                </tree>
            </field>
        </record>
        <record id="students_students_action" model="ir.actions.act_window">
            <field name="name">Students</field>
            <field name="res_model">students.students</field>
            <field name="view_mode">tree,form</field>
        </record>
        <menuitem name="School Management" id="school_man_menu" sequence="85"/>
        <menuitem name="Students" id="school_students_menu" sequence="10" parent="school_man_menu"/>
        <menuitem name="Student Info" id="schools_info" sequence="10" parent="school_students_menu" action="students_students_action"/>
    </data>
</openerp>

#study room view

<openerp>
    <data>
        <menuitem name="Study Room" parent="students.school_man_menu" id="study_room_categ"/>
        <record id="study_room_form" model="ir.ui.view">
            <field name="name">Study Room Form</field>
            <field name="model">study.room</field>
            <field name="arch" type="xml">
                <form string="Study Room">
                    <sheet>
                        <group>
                            <field name="name"/>
                            <field name="no_of_students"/>
                        </group>
                        <notebook>
                            <page string="Students">
                                <field name="student_ids"/>
                            </page>
                            <page string="Teachers">
                                <field name="teacher_ids"/>
                            </page>
                        </notebook>
                    </sheet>
                </form>
            </field>
        </record>
        <record id="study_room_tree" model="ir.ui.view">
            <field name="name">Study Room Tree View</field>
            <field name="model">study.room</field>
            <field name="arch" type="xml">
                <tree string="Study Room">
                    <field name="name"/>
                    <field name="no_of_students"/>
                </tree>
            </field>
        </record>
        <record id="study_room_action" model="ir.actions.act_window">
            <field name="name">Study Room</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">study.room</field>
            <field name="view_mode">tree,form</field>
            <field name="help" type="html">
                <p class="oe_view_nocontent_create">
                    Click Here to create study rooms
                </p>
            </field>
        </record>
        <menuitem name="Study Room" parent="study_room_categ" id="study_room_act" action="study_room_action"/>
    </data>
</openerp>