I'm struggling to join 3 tables together and I can't seem to figure
out the correct syntax to do this:
I have 3 classes that are laid out like this:
6 class Bar(Entity):
7 has_field('col_a', Integer(), unique=True)
8 using_options(tablename='bar')
9
10 class Blah(Entity):
11 has_field('col_a', Integer(), unique=True)
12 using_options(tablename='blah')
13
14 class Foo(Entity):
15 belongs_to('bar', of_kind='Bar')
16 belongs_to('blah', of_kind='Blah')
17 using_options(tablename='foo')
What I want to express is a join between Foo, Bar and Blah, and fetch
Foo records where Bar and Blah have specified values.
So something like this:
select foo.* from foo, bar, blah where foo.bar_id = bar.id and
foo.blah_id = blah.id and bar.col_a = 42 and blah.col_a = 55;
Can someone point out the part of the elixir or sqlalchemy ORM
documentation that I should be looking at?
thanks
vic
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