From 3d7e0a2bf7ab0af79ff87992a728e23bec042cd8 Mon Sep 17 00:00:00 2001
From: Charles Leifer <coleifer@gmail.com>
Date: Sat, 14 Dec 2024 11:14:44 -0600
Subject: [PATCH] Slight cleanup of foreign-key constraint name stuff.

---
 peewee.py            | 30 +++++++++++++++---------------
 playhouse/migrate.py |  7 +++++--
 2 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/peewee.py b/peewee.py
index 3c2711117..2d421b9fa 100644
--- a/peewee.py
+++ b/peewee.py
@@ -5564,6 +5564,12 @@ def get_modifiers(self):
             return self.rel_field.get_modifiers()
         return super(ForeignKeyField, self).get_modifiers()
 
+    def get_constraint_name(self):
+        return self.constraint_name or 'fk_%s_%s_refs_%s' % (
+            self.model._meta.table_name,
+            self.column_name,
+            self.rel_model._meta.table_name)
+
     def adapt(self, value):
         return self.rel_field.adapt(value)
 
@@ -5613,10 +5619,14 @@ def bind(self, model, name, set_attribute=True):
                 setattr(self.rel_model, self.backref,
                         self.backref_accessor_class(self))
 
-    def foreign_key_constraint(self):
+    def foreign_key_constraint(self, explicit_name=False):
         parts = []
-        if self.constraint_name:
-            parts.extend((SQL('CONSTRAINT'), Entity(self.constraint_name)))
+        if self.constraint_name or explicit_name:
+            name = self.get_constraint_name()
+            parts.extend([
+                SQL('CONSTRAINT'),
+                Entity(_truncate_constraint_name(name))])
+
         parts.extend([
             SQL('FOREIGN KEY'),
             EnclosedNodeList((self,)),
@@ -6145,22 +6155,12 @@ def drop_sequence(self, field):
             self.database.execute(seq_ctx)
 
     def _create_foreign_key(self, field):
-        if not field.constraint_name:
-            name = 'fk_%s_%s_refs_%s' % (field.model._meta.table_name,
-                                         field.column_name,
-                                         field.rel_model._meta.table_name)
-            nodes = NodeList((SQL(' CONSTRAINT'),
-                              Entity(_truncate_constraint_name(name))))
-        else:
-            nodes = NodeList(())
         return (self
                 ._create_context()
                 .literal('ALTER TABLE ')
                 .sql(field.model)
-                .literal(' ADD')
-                .sql(nodes)
-                .literal(' ')
-                .sql(field.foreign_key_constraint()))
+                .literal(' ADD ')
+                .sql(field.foreign_key_constraint(True)))
 
     def create_foreign_key(self, field):
         self.database.execute(self._create_foreign_key(field))
diff --git a/playhouse/migrate.py b/playhouse/migrate.py
index cb0927603..56f49d68c 100644
--- a/playhouse/migrate.py
+++ b/playhouse/migrate.py
@@ -286,8 +286,11 @@ def add_inline_fk_sql(self, ctx, field):
 
     @operation
     def add_foreign_key_constraint(self, table, column_name, rel, rel_column,
-                                   on_delete=None, on_update=None):
-        constraint = 'fk_%s_%s_refs_%s' % (table, column_name, rel)
+                                   on_delete=None, on_update=None,
+                                   constraint_name=None):
+        constraint = constraint_name or 'fk_%s_%s_refs_%s' % (table,
+                                                              column_name,
+                                                              rel)
         ctx = (self
                .make_context()
                .literal('ALTER TABLE ')