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Optional second argument to .lookup() to populate extra columns, closes #339

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Simon Willison 2021-11-14 18:01:56 -08:00
commit 54a2269e91
3 changed files with 53 additions and 11 deletions
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34
sqlite_utils/db.py
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@ -2713,7 +2713,11 @@ class Table(Queryable):
self.add_column(col_name, col_type)
return self
def lookup(self, column_values: Dict[str, Any]):
def lookup(
self,
lookup_values: Dict[str, Any],
extra_values: Optional[Dict[str, Any]] = None,
):
"""
Create or populate a lookup table with the specified values.
@ -2725,28 +2729,36 @@ class Table(Queryable):
It will then insert a new row with the ``name`` set to ``Palm`` and return the
new integer primary key value.
An optional second argument can be provided with more ``name: value`` pairs to
be included only if the record is being created for the first time. These will
be ignored on subsequent lookup calls for records that already exist.
See :ref:`python_api_lookup_tables` for more details.
"""
# lookups is a dictionary - all columns will be used for a unique index
assert isinstance(column_values, dict)
assert isinstance(lookup_values, dict)
if extra_values is not None:
assert isinstance(extra_values, dict)
combined_values = dict(lookup_values)
if extra_values is not None:
combined_values.update(extra_values)
if self.exists():
self.add_missing_columns([column_values])
self.add_missing_columns([combined_values])
unique_column_sets = [set(i.columns) for i in self.indexes]
if set(column_values.keys()) not in unique_column_sets:
self.create_index(column_values.keys(), unique=True)
wheres = ["[{}] = ?".format(column) for column in column_values]
if set(lookup_values.keys()) not in unique_column_sets:
self.create_index(lookup_values.keys(), unique=True)
wheres = ["[{}] = ?".format(column) for column in lookup_values]
rows = list(
self.rows_where(
" and ".join(wheres), [value for _, value in column_values.items()]
" and ".join(wheres), [value for _, value in lookup_values.items()]
)
)
try:
return rows[0]["id"]
except IndexError:
return self.insert(column_values, pk="id").last_pk
return self.insert(combined_values, pk="id").last_pk
else:
pk = self.insert(column_values, pk="id").last_pk
self.create_index(column_values.keys(), unique=True)
pk = self.insert(combined_values, pk="id").last_pk
self.create_index(lookup_values.keys(), unique=True)
return pk
def m2m(