addons-cm/pos_attribute_image_lazy

POS Attribute Image Lazy Loading

Keeps product.attribute.value images out of the pos.session.load_pos_data payload.

The problem

pos.session._get_attributes_by_ptal_id() inlines the base64 image of every attribute value of a create_variant='no_variant' attribute, once per attribute line referencing it. With a handful of photo sized images this grows without bound and the request dies while serialising the response:

File "werkzeug/wrappers/response.py", line 327, in set_data
    value = value.encode(self.charset)
MemoryError

The browser only sees ConnectionLostError on /web/dataset/call_kw/pos.session/load_pos_data, with no traceback in the POS.

Note that product.attribute.value.image is capped at 70x70 upstream, but product.template.attribute.value.image is a related field declared without max_width/max_height, so uploading through a product template's attribute lines stores the original untouched.

The fix

The POS front end never reads those bytes. point_of_sale.ColorProductAttribute only tests the field for truthiness and renders the swatch from /web/image/product.template.attribute.value/<id>/image. Reading under bin_size returns the attachment size instead of its content, which is still truthy, so nothing changes visually.

Measured on a production database with 224 images of ~1 MB:

	load_pos_data payload
Without the module	145.93 MB
With the module	0.51 MB