<field name="book_ids" widget="many2many_tags" options='{"color_field":"color"}'/>
This field name book_ids not show color in many2many relation.
also put a python file. not show color.color = fields.Integer('color index')
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<field name="book_ids" widget="many2many_tags" options='{"color_field":"color"}'/>
This field name book_ids not show color in many2many relation.
also put a python file. not show color.color = fields.Integer('color index')
Are you trying to change color of many2many tree view or tags or what?