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30 lines
1.1 KiB
ReStructuredText
30 lines
1.1 KiB
ReStructuredText
Dynamic catalogs
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.. module:: dependency_injector.catalogs
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:py:class:`DynamicCatalog` is a catalog of providers that could be created in
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application's runtime. It should cover most of the cases when list of
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providers that would be included in catalog is non-deterministic in terms of
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apllication code (catalog's structure could be determined just after
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application will be started and will do some initial work, like parsing list
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of catalog's providers from the configuration).
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:py:class:`DeclarativeCatalog` and :py:class:`DynamicCatalog` have
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100% API parity.
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Main difference between :py:class:`DeclarativeCatalog` and
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:py:class:`DynamicCatalog` is that :py:class:`DeclarativeCatalog` acts on
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class-level, while :py:class:`DynamicCatalog` do the same on
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instance-level.
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Here is an simple example of defining dynamic catalog with several factories:
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.. literalinclude:: ../../examples/catalogs/dynamic.py
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:language: python
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Next one example demonstrates creation and runtime filling of dynamic catalog:
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.. literalinclude:: ../../examples/catalogs/dynamic_runtime_creation.py
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:language: python
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