Hi friends, I have two models called Gallery and GalleryLine

class Gallery(models.Model):
 _name = 'website.gallery'
 name = fields.Char(string="Album Name", required=True)
 media_lines = fields.One2many('website.gallery.line.medias', 'gallery_id', string="Media Lines")

class GalleryLine(models.Model): 
 _name = 'website.gallery.line'
 def get_default_image(self):
  image_path = get_module_resource('website_gallery', 'static/src/images', 'default_image.png')
  return tools.image_resize_image_big(open(image_path, 'rb').read().encode('base64')) 
 @api.depends('image')
 def _compute_thumbnail_image(self):
  size = (300, 225)
  for record in self: 
   self.thumbnail_image = tools.image_resize_image(self.image, size)
 name = fields.Char(string="Media Name", required=True)
 media_type = fields.Selection(selection=[
 ('image', 'Image'),
 ('video', 'Youtube Video'),
 ], string="Media Type", default='image', required=True)
 image = fields.Binary(string="Image", default=get_default_image) 
 thumbnail_image = fields.Binary(string="Thumbnail Image", compute='_compute_thumbnail_image') 
 video = fields.Text(string="Video", translate=False)
 gallery_id = fields.Many2one(comodel_name='website.gallery', delegate=True, required=True, string="Album Name")

And I created a kanban view which was given below  

<record model="ir.ui.view" id="view_gallery_albums_kanban">
 <field name="name">gallery.albums.kanban</field>
 <field name="model">website.gallery</field>
 <field name="type">kanban</field>
 <field name="arch" type="xml">
 <kanban class="oe_background_grey">
 <field name="name" />
 <field name="description" />
 <field name="sequence" />
 <field name="media_lines" />
 <templates>
 <t t-name="kanban-box">
 <a name="%(website_gallery.view_gallery_media)d" type="action"
 class="oe_sparkline_bar_link">
 <div class="oe_kanban_card oe_kanban_global_click">
 <div class="oe_kanban_content">
 <h4 class="text-center" name="name">
 <strong>
 <field name="name" />
 </strong>
 </h4>
 <div class="oe_clear"></div>
 <!-- -->
 <div class="oe_kanban_gallery_avatars">
 <t t-foreach="record.media_lines.raw_value.slice(0,3)"
 t-as="image">
<img t-if="record.media_lines.media_type.raw_value=='image'"
t-att-src="kanban_image('website.gallery.line.medias', 'image', image)"
t-att-data-member_id="image" />
<t t-if="record.media_lines.media_type.raw_value=='video'">
<!-- Something other -->
</t>
</t>
 </div>
 <!-- -->
 <div class="oe_clear"></div>
 <div class="oe_center oe_gallery_description text-center"
 name="description">
 <field name="description" />
 </div>
 </div>
 </div>
 </a>
 </t>
 </templates>
 </kanban>
 </field>
 </record>

I have problem exactly on this line

<t t-foreach="record.media_lines.raw_value.slice(0,3)"
 t-as="image">
<img t-if="record.media_lines.media_type.raw_value=='image'"
t-att-src="kanban_image('website.gallery.line.medias', 'image', image)"
t-att-data-member_id="image" />
<t t-if="record.media_lines.media_type.raw_value=='video'">
<!-- Something other -->
</t>
</t>

I will getting this error:

Error: QWeb2 - template['kanban-box']: Runtime Error: TypeError: dict.record.media_lines.media_type is undefined

How can we achieve to take the field value of another model in kanban view? Thanks in advance..