I have been using these related functions:
def get_or_create(table, fields):
"""
Return ID of record from table with passed field values.
Create record if does not exist.
'table' is a DAL table reference, such as 'db.person'
'fields' is a dict, such as {'parent': 4, name: 'Richard'}
"""
logic = reduce(lambda a, b : a & b, [table[k] == fields[k] for
k in fields])
record = self.db(logic).select(table['id']).first()
if record:
return record.id
else:
return table.insert(**fields).id
def update_or_create(table, required_fields, updated_fields):
"""
Modify record from table that matches 'required_fields' with
'updated_fields'.
If record with 'required_fields' does not exist then create
it.
'table' is a DAL table reference, such as 'db.person'
'required_fields' and 'updated_fields' are dicts, such as
{'parent': 4, name: 'Richard'}
"""
logic = reduce(lambda a, b : a & b, [table[k] ==
required_fields[k] for k in required_fields])
record = self.db(logic).select().first()
if record is None:
record = table.insert(**required_fields)
record.update_record(**updated_fields)
On Mar 17, 7:45 am, Michael Toomim <too...@gmail.com> wrote:
> Hi guys, I've found the following functions to be commonly useful in
> practice. Has anyone else written anything similar? Is there a better
> idiom here, or better names or interfaces for these?
>
> def get_one(query):
> result = db(query).select()
> assert len(result) <= 1, "GAH get_one called when there's MORE
> than one!"
> return result[0] if len(result) == 1 else None
>
> def get_or_make_one(query, table, default_values):
> result = get_one(query)
> if not result:
> table.insert(**default_values)
> return get_one(query)
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