[IMP] tutorials: add warning about mutable global variables
The whole concept of multi-tenancy is not really approached within the tutorial. This commit adds a warning about never using mutable global variables within odoo to seed the idea in the reader's mind. task-3059110 closes odoo/documentation#3970 Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
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@ -13,6 +13,14 @@ tools to facilitate database interactions.
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Before moving forward in the exercise, make sure the ``estate`` module is installed, i.e. it
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must appear as 'Installed' in the Apps list.
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.. warning::
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Do not use mutable global variables.
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A single Odoo instance can run several databases in parallel within the same python process.
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Distinct modules might be installed on each of these databases, therefore we cannot rely on
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global variables that would be updated depending on installed modules.
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Object-Relational Mapping
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=========================
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