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Left some words on the settings mixin (#442)

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* started python API reference guide

* Added test to the API reference guide

* Added Price break

* added context variables to the build section

* Cleand up build section and added new example

* Fine tuning

* fixed picture

* removed unfinished python reference guide

* Added allocated_stock to the build rreport

* Added contect variables for user model

* Added link to user in build.md

* Fixed misunderstanding of can_complete

* Added context variables for Suppliers

* Fixed typos

* Added example for a warehouse pick list

* Added path trick to the picklist example

* Corrected typo

* Added context variables for stock locations

* changed some wordings

* Added a remark for get_setting

* Added example on int validator
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docs/extend/plugins/settings.md
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@ -11,7 +11,7 @@ The *SettingsMixin* allows the plugin to save and load persistent settings to th
Use the class constant `SETTINGS` for a dict of settings that should be added as global database settings.
The dict must be formatted similar to the following sample. Take a look at the settings defined in `InvenTree.common.models.InvenTreeSetting` for all possible parameters.
The dict must be formatted similar to the following sample that shows how to use validator choices and default. Take a look at the settings defined in `InvenTree.common.models.InvenTreeSetting` for all possible parameters.
``` python
@ -36,13 +36,31 @@ class PluginWithSettings(SettingsMixin, InvenTreePlugin):
'description': _('Base URL for remote server'),
'default': 'http://remote.url/api',
},
'CONNECTION': {
'name': _('Printer Interface'),
'description': _('Select local or network printer'),
'choices': [('local','Local printer e.g. USB'),('network','Network printer with IP address')],
'default': 'local',
},
'NUMBER': {
'name': _('A Name'),
'description': _('Descripe me here'),
'default': 6,
'validator': [
int,
MinValueValidator(2),
MaxValueValidator(25)
]
},
}
```
This mixin defines the helper functions `plugin.get_setting` and `plugin.set_seting` to access all plugin specific settings:
```python
api_url = self.get_setting('API_URL')
api_url = self.get_setting('API_URL', cache = False)
self.set_setting('API_URL', 'some value')
```
`get_setting` has an additional parameter which lets control if the value is taken directly from the database or from the cache. If it is left away `False` ist the default that means the value is taken directly from the database.