What is the max length of an external id for models ?
Odoo is the world's easiest all-in-one management software.
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Short Answer:
There is no limit.
Long Answer:
An External ID has two parts: module and name, separated by a period character during import.
Each part can have up to 10,485,760 characters.
The total length of an External ID is 20,971,520 characters - 10,485,760 each side of the "." in the middle.
An example of a "long" External ID in Odoo is:
account_reports.selection__account_financial_html_report_line__special_date_changer__to_beginning_of_period
You will run into a practical limit of working with External ID's in technology (user experience issues - editing/display) well before you run into physical limitations or performance issues.
