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22 lines
838 B
Markdown
22 lines
838 B
Markdown
---
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title: Sources expression property mappings
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---
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The property mapping should return a value that is expected by the source. Returning `None` is always accepted and would simply skip the mapping for which `None` was returned.
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## Variables
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- Arbitrary arguments given by the source (this is documented by the source).
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- `properties`: A Python dictionary containing the result of the previously run property mappings, plus the initial data computed by the source.
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- `request`: The current request. This may be `None` if there is no contextual request. See ([Django documentation](https://docs.djangoproject.com/en/3.0/ref/request-response/#httprequest-objects))
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import Objects from "../../../expressions/\_objects.md";
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<Objects />
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## Available Functions
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import Functions from "../../../expressions/\_functions.mdx";
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<Functions />
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