Sample syntax for various query operations

qsample.py

# Single hash key, multiple filters
# =================================

# Pure condition syntax, no **kwargs overloading
# ----------------------------------------------
q = engine.query(Forum)
    .key(Forum.name == "S3")
    .filter(Forum.subscribers > MIN_SUBSCRIBERS,
            Forum.views >= MIN_VIEWS)

# Only overload **kwargs, no condition syntax
#--------------------------------------------
q = engine.query(Forum)
    .key(name="S3")
    .filter(subscribers=GT(MIN_SUBSCRIBERS),
            views=GE(MIN_VIEWS))

# Hash and Range keys, single filter
# =================================

# Pure condition syntax, no **kwargs overloading
# ----------------------------------------------
q = engine.query(Thread)
    .key(Thread.forum_name == "S3",
         Thread.subject.between("Hello", "World"))
    .filter(Thread.replies >= MIN_REPLIES)

# Only overload **kwargs, no condition syntax
#--------------------------------------------
q = engine.query(Thread)
    .key(forum_name="S3",
         subject=between("Hello", "World"))
    .filter(replies=GE(MIN_REPLIES))