加入Peewee的查询

Question

Hello Stackoverflow Community,

I have just started working on peewee application and little stuck with join queries. Currently, I have following models setup :

class Equipment(BaseModel):
    equip_id = CharField(primary_key=True)
    is_fullset = BooleanField(default=False)


class Department(BaseModel):
    dept_id = IntegerField(primary_key=True)
    dept_name = CharField()


class User(BaseModel):
    email = CharField(primary_key=True)
    equip_id_fk = ForeignKeyField(Equipment, related_name="equipments", null=True)
    dept_id_fk = ForeignKeyField(Department, related_name="departments")
    user_name = CharField()

I want to display a view/table that will hold combined information of all the table. I tried doing this like this for User and Equipment (for now) :

  query = (Equipment.select(Equipment, User).join(User, JOIN.LEFT_OUTER))

Here I get equipment values first and then User. I tried changing User with Equipment and vice versa, but didn't work out well. Basically, I want to display all these three tables into one singular table in this order:

User Name || User Email || Dept_ID || Dept_NAME || EQUIP_ID || Is_Fullset

Please let me know if I need to change my models or query. Any help would be really appreciated.

Answer 1

query = (User
         .select(User, Equipment, Department)
         .join(Equipment, JOIN.INNER)
         .switch(User)
         .join(Department, JOIN.INNER))
for row in query:
    print(row.user_name, row.email, row.dept_id_fk.dept_id,
          row.dept_id_fk.dept_name, row.equip_id_fk.equip_id,
          row.equip_id_fk.is_fullset)