[rset] fix infinite recursion introduced in c1eb5a676c80 The mechanism to avoid loops in c1eb5a676c80 "[rset] Always complete attribute/relation caches in ResultSet.get_entity" breaks down: we would loop forever if two entities that were already in the cache were linked by a relation with ? or 1 cardinality in both directions. To avoid that, keep a set of already-considered columns. Related to #9942503.

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Tutorials

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We present a few tutorials of different levels. The blog building

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tutorial introduces one smoothly to the basic concepts.

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Then there is a photo gallery construction tutorial which highlights

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more advanced concepts such as unit tests, security settings,

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migration scripts.

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.. toctree::

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   :maxdepth: 1

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   base/index

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   advanced/index

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   tools/windmill.rst

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   textreports/index

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   dataimport/index