web/web_widget_x2many_2d_matrix/readme/DESCRIPTION.md

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This module allows to show an x2many field with 3-tuples ($x_value, $y_value, $value) in a table

$x_value1 $x_value2
$y_value1 $value(1/1) $value(2/1)
$y_value2 $value(1/2) $value(2/2)

where value(n/n) is editable.

An example use case would be: Select some projects and some employees so that a manager can easily fill in the planned_hours for one task per employee. The result could look like this:

Screenshot

The beauty of this is that you have an arbitrary amount of columns with this widget, trying to get this in standard x2many lists involves some quite ugly hacks.