'res.one' has a one2many relation with 'res.many'.

'res.one' should pass a default value of the field 'model_id' in 'res.many'.

This works: context={'default_model_id': 1}

This gives error: context={'default_model_id': self.env.ref('one2many_error.model_res_one').id}

Why?

__manifest__.py

{
    'name': "one2many_error",
    'depends': ['base'],
    'data': ['views.xml'],
}

models.py

from odoo import api, fields, models, _

class Many(models.Model):
    _name = 'res.many'
    name = fields.Char()
    model_id = fields.Many2one('ir.model')
    one_id = fields.Many2one('res.one')

class One(models.Model):
    _name = 'res.one'
    name = fields.Char()

    def _compute_context(self):
        #return {'default_model_id': self.env.ref('one2many_error.model_res_one').id}
        return {'default_model_id': 1}

    many_ids = fields.One2many('res.many', 'one_id', 
        context=_compute_context,
    )

views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record model="ir.ui.view" id="view_res_one_a_form">
            <field name="name">res.one.form</field>
            <field name="model">res.one</field>
    		<field name="priority" eval="20"/>
    		<field name="arch" type="xml">
                <form>
                    <field name="name"/>
                    <field name="many_ids">
                        <tree editable="bottom">
                            <field name="name"/>
                            <field name="model_id"/>
                            <field name="one_id"/>
                        </tree>
                    </field>
                </form>
            </field>
        </record>
    </data>
</odoo>

Odoo Server Error

Traceback (most recent call last):
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 640, in _handle_exception
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 677, in dispatch
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 333, in _call_function
  File "C:\Program Files\Odoo 10.0\server\odoo\service\model.py", line 101, in wrapper
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 326, in checked_call
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 935, in __call__
  File "C:\Program Files\Odoo 10.0\server\odoo\http.py", line 506, in response_wrap
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\web\controllers\main.py", line 894, in call_button
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\web\controllers\main.py", line 882, in _call_kw
  File "C:\Program Files\Odoo 10.0\server\odoo\api.py", line 689, in call_kw
  File "C:\Program Files\Odoo 10.0\server\odoo\api.py", line 680, in call_kw_multi
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\module\module.py", line 528, in button_immediate_upgrade
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\module\module.py", line 485, in _button_immediate_function
  File "C:\Program Files\Odoo 10.0\server\odoo\modules\registry.py", line 83, in new
  File "C:\Program Files\Odoo 10.0\server\odoo\modules\loading.py", line 335, in load_modules
  File "C:\Program Files\Odoo 10.0\server\odoo\modules\loading.py", line 237, in load_marked_modules
  File "C:\Program Files\Odoo 10.0\server\odoo\modules\loading.py", line 156, in load_module_graph
  File "C:\Program Files\Odoo 10.0\server\odoo\modules\loading.py", line 95, in _load_data
  File "C:\Program Files\Odoo 10.0\server\odoo\tools\convert.py", line 845, in convert_file
  File "C:\Program Files\Odoo 10.0\server\odoo\tools\convert.py", line 915, in convert_xml_import
  File "C:\Program Files\Odoo 10.0\server\odoo\tools\convert.py", line 796, in parse
  File "C:\Program Files\Odoo 10.0\server\odoo\tools\convert.py", line 799, in parse
  File "C:\Program Files\Odoo 10.0\server\odoo\tools\convert.py", line 707, in _tag_record
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\ir\ir_model.py", line 1190, in _update
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\ir\ir_ui_view.py", line 380, in write
  File "C:\Program Files\Odoo 10.0\server\odoo\models.py", line 3565, in write
  File "C:\Program Files\Odoo 10.0\server\odoo\fields.py", line 1041, in determine_inverse
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\ir\ir_ui_view.py", line 220, in _inverse_arch
  File "C:\Program Files\Odoo 10.0\server\odoo\addons\base\ir\ir_ui_view.py", line 380, in write
  File "C:\Program Files\Odoo 10.0\server\odoo\models.py", line 3557, in write
  File "C:\Program Files\Odoo 10.0\server\odoo\models.py", line 3708, in _write
  File "C:\Program Files\Odoo 10.0\server\odoo\models.py", line 1079, in _validate_fields
ParseError: "Error while validating constraint

'Environment' object has no attribute 'env'
None" while parsing file:///c:/users/henrik/documents/bitbucket/test/one2many_error/views.xml:4, near
<record model="ir.ui.view" id="view_res_one_a_form">
            <field name="name">res.one.form</field>
            <field name="model">res.one</field>
    		<field name="priority" eval="20"/>
    		<field name="arch" type="xml">
                <form>
                    <field name="name"/>
                    <field name="many_ids">
                        <tree editable="bottom">
                            <field name="name"/>
                            <field name="model_id"/>
                            <field name="one_id"/>
                        </tree>
                    </field>
                </form>
            </field>
        </record>