[req] New method: RequestSessionBase.find(). This method does what find_entities and find_one_entity did, except it returns the resultset itself. In addition, it accepts 'reverse_' arguments and check that the relations actually exists on the entity before executing the query. Also, reimplement find_one_entity and find_entity based on the new function so they benefit from the more complete implementation, and deprecate them. Note: List of values in kwargs are NOT supported in this initial implementation. Closes #3361290

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from cubicweb.schemas.base import in_group, CWSourceSchemaConfig

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# copy __permissions__ to avoid modifying a shared dictionary

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in_group.__permissions__ = in_group.__permissions__.copy()

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in_group.__permissions__['read'] = ('managers',)

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cw_for_source = CWSourceSchemaConfig.get_relation('cw_for_source')

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cw_for_source.__permissions__ = {'read': ('managers', 'users'),

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                                 'add': ('managers',),

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                                 'delete': ('managers',)}

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