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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallYes. A PrestaShop module can delete another module’s setting if both use the same configuration key and the uninstall routine removes that key. The settings live in shared Configuration storage, not in a separate table for each module. PrestaShop’s legacy Configuration::deleteByName($key) deletes the matching value for all shops, so a key collision can have consequences beyond the shop where it was noticed.
What “global” means in PrestaShop Configuration
PrestaShop stores keyed settings in a shared configuration table; the table is not partitioned into one configuration table per module. But “shared” does not mean every setting has only one value for the entire installation: Configuration supports shop and shop-group overrides. The current Configuration storage documentation explains that operations generally use the current shop context unless a ShopConstraint specifies another scope. ShopConstraint::allShops() explicitly targets all shops.
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That distinction matters during cleanup. A module may work with values in a particular shop context, while its uninstall code uses a removal operation that reaches every shop. Check both the key and the deletion scope.
How a key collision can affect another module
Configuration values are addressed by key. If two modules use the same key, the storage and deletion APIs do not inherently establish which module “owns” it. An uninstall routine that removes a colliding key can therefore remove a value another module expects.
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The legacy static method Configuration::deleteByName(string $key) is documented to delete the key’s value for all shops. The current Configuration service’s remove($key) operation is also documented as removing the value for all shops. The current service supports ShopConstraint for operations where scope should be explicit, but that does not make a non-unique key safe: a broad deletion still needs to target a key the module owns. See the current Configuration documentation and backward-compatibility documentation.
Why the tutorial example is not a safety guarantee
The PrestaShop 9 first-module tutorial demonstrates storing MYMODULE_NAME during installation and deleting that key in the example uninstall method. It also explains that Configuration data is stored in the PREFIX_configuration table and that setting Shop::CONTEXT_ALL applies subsequent changes to all existing stores.
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This is an example of cleaning up a module’s own data, not evidence that any uninstall method is safe for arbitrary keys. The relevant question is whether the key is distinctively named and actually belongs to the module being removed.
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How module authors can make cleanup safer
- Namespace every setting. Give module-owned keys a distinctive module prefix rather than a generic name. PrestaShop’s module good-practices guidance recommends prefixing configuration parameters.
- Delete only keys the module owns. Review the uninstall method and confirm each key is unique to the module. Avoid removing generic or shared names just because they appear in the module’s code.
- Make scope intentional. Before an all-shop deletion, decide whether values in every shop should be removed. For newer code, follow the Configuration service guidance and specify a
ShopConstraintwhen an operation’s shop scope should be explicit. - Consider the installed version. Choose between the current Configuration service and legacy static API based on the PrestaShop version the module supports, the required shop scope, and the method’s deletion semantics. Both documented deletion methods can remove a key’s value across all shops.
What to check before uninstalling a module
- Inspect the module’s uninstall method and list every configuration key it removes.
- Check whether those keys use a distinctive module prefix or could be shared with other code.
- Confirm whether the cleanup operation targets the current shop, a specified scope, or all shops.
- If the keys are generic or their ownership is unclear, review the module’s source and your shop’s configuration before uninstalling it.
The impact depends on the specific module’s implementation and the keys it deletes. The documentation establishes the shared storage and deletion behavior, but it does not establish that any particular module has a collision; that requires inspecting its uninstall code.
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