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Implement conflict handling #109

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Implement conflict handling #109

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dde4a37
Implement conflict handling
pauloxnet Sep 2, 2019
9ff9306
Merge branch 'master' into feature/91-conflict-update
pauloxnet Mar 6, 2020
b98d934
Merge branch 'california-civic-data-coalition:master' into feature/91…
pauloxnet May 10, 2021
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36 changes: 30 additions & 6 deletions postgres_copy/copy_from.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,10 @@ def __init__(
force_null=None,
encoding=None,
ignore_conflicts=False,
static_mapping=None
static_mapping=None,
on_conflict=[],
static_mapping_on_conflict=None,
temp_table_name_suffix=""
):
# Set the required arguments
self.model = model
Expand Down Expand Up @@ -90,7 +93,10 @@ def __init__(
self.validate_mapping()

# Configure the name of our temporary table to COPY into
self.temp_table_name = "temp_%s" % self.model._meta.db_table
self.temp_table_name = "temp_%s" % (self.model._meta.db_table + "_" + temp_table_name_suffix)

self.on_conflict = on_conflict
self.static_mapping_on_conflict = static_mapping_on_conflict

def save(self, silent=False, stream=sys.stdout):
"""
Expand Down Expand Up @@ -316,10 +322,28 @@ def insert_suffix(self):
"""
Preps the suffix to the insert query.
"""
if self.ignore_conflicts:
return """
ON CONFLICT DO NOTHING;
"""
# If on_conflict is not an empty list
if self.on_conflict:
on_conflict = self.on_conflict.copy()
# First item on list - Operation
if on_conflict[0] == 'DO NOTHING':
return """
ON CONFLICT DO NOTHING;
"""
elif on_conflict[0] == 'DO UPDATE':
# Second item on list - Constraint
constraint = on_conflict[1]
# Delete first two items on list. Only columns to be updated remain
del on_conflict[0:2]
update_columns = ', '.join(["{0} = EXCLUDED.{0}".format(col) for col in on_conflict])
if self.static_mapping_on_conflict is not None:
update_columns += ', '
update_columns += ', '.join(["{0} = '{1}'".format(
col, self.static_mapping_on_conflict[col]
) for col in self.static_mapping_on_conflict])
return """
ON CONFLICT {0} DO UPDATE SET {1};
""".format(constraint, update_columns)
else:
return ";"

Expand Down