Hi, I'm a beginner reading the "Basic Relationship Patterns" documentation:
http://docs.sqlalchemy.org/en/latest/orm/basic_relationships.html The examples are confusing to me because all of the examples use "Parent" and "Child," which in reality have a Many-to-Many relationship. It was unclear to me whether the "One To Many" example illustrates "one parent to many children" or "one child to many parents." Understanding from the code samples (which are all very similar) presupposes a certain level of familiarity with how relationships are constructed in SQLAlchemy. I think I've understood the first two examples to be: One To Many: - one Parent to many Children - Child has foreign key referencing Parent - Parent has relationship referencing a collection of Children Many To One: - one Child to many Parents - Parent has foreign key referencing its Child - Parent has relationship referencing a single Child The latter example is confusing because so many aspects are being swapped around. It would be clearer to instead use the same "one Parent to many Children" scenario: Many To One: - one Parent to many Children - Child has foreign key referencing its Parent - Child has relationship referencing a single Parent This makes it clearer that only the third aspect---which side the relationship was declared on---has changed. The documentation would be improved by switching to more intuitive examples. How about One To Many, Many To One: Countries and Cities One To One: Capitals and Countries Many To Many: Organizations and Members It would help to explicitly state the scenario that is being modeled in each case, even if it appears obvious. The descriptions of the current examples all immediately jump into technical details of foreign keys, scalars, and association tables. Ryan -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
