user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=(User.username,), # Which constraint? preserve=(User.last_login,), # Use the value row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, conflict_target=None]]]]]) action (str) – Action to take when resolving conflict. update – A dictionary mapping

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=(User.username,), # Which constraint? preserve=(User.last_login,), # Use the value row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, conflict_target=None]]]]]) action (str) – Action to take when resolving conflict. update – A dictionary mapping

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name now() rowid = (User .insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=(User.username,), # Which constraint? preserve=(User.last_login,), # Use the value we would have row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, con- flict_target=None]]]]]) Parameters • action (str) – Action to take when resolving conflict. • update – A dictionary

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name now() rowid = (User .insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=(User.username,), # Which constraint? preserve=(User.last_login,), # Use the value we would have row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, con- flict_target=None]]]]]) Parameters • action (str) – Action to take when resolving conflict. • update – A dictionary

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=[User.username], # Which constraint? preserve=[User.last_login], # Use the value we between MySQL and Postgresql/SQLite is that Postgresql and SQLite require that you specify a conflict_target. For more information, see Insert.on_conflict() and OnConflict. Deleting records To delete a single

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name now() rowid = (User .insert(username='huey', last_login=now, login_count=1) .on_conflict( conflict_target=[User.username], # Which constraint? preserve=[User.last_login], # Use the value we would have inserted between MySQL and Postgresql/SQLite is that Postgresql and SQLite require that you specify a conflict_target. For more information, see Insert.on_conflict() and OnConflict. 1.7.5 Deleting records To delete

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, conflict_target=None]]]]]) action (str) – Action to take when resolving conflict. update – A dictionary mapping whose values should be preserved. where – Expression to restrict the conflict resolution. conflict_target – Name of column or constraint to check. Parameters: Parameters: Parameters: Parameters: Parameters:

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, conflict_target=None]]]]]) Parameters: Parameters: Parameters: Parameters: Parameters: Parameters: action whose values should be preserved. where – Expression to restrict the conflict resolution. conflict_target – Name of column or constraint to check. Represent a conflict resolution clause for a data-modification

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name row tuple. class OnConflict([action=None[, update=None[, preserve=None[, where=None[, con- flict_target=None]]]]]) Parameters • action (str) – Action to take when resolving conflict. • update – A dictionary values should be preserved. • where – Expression to restrict the conflict resolution. • conflict_target – Name of column or constraint to check. Represent a conflict resolution clause for a data-modification

user_id, tweet.message) ForeignKeyField allows for a backreferencing property to be bound to the target model. Implicitly, this property will be named classname_set, where classname is the lowercase name