make it possible to change models etc by editing options using API

modules/api/api.py

@@ -253,9 +253,8 @@ def get_config(self):
         return options
 
     def set_config(self, req: Dict[str, Any]):
-
-        for o in req:
-            setattr(shared.opts, o, req[o])
+        for k, v in req.items():
+            shared.opts.set(k, v)
 
         shared.opts.save(shared.config_filename)
         return
@@ -264,7 +263,7 @@ def get_cmd_flags(self):
         return vars(shared.cmd_opts)
 
     def get_samplers(self):
-        return [{"name":sampler[0], "aliases":sampler[2], "options":sampler[3]} for sampler in sd_samplers.all_samplers]
+        return [{"name": sampler[0], "aliases":sampler[2], "options":sampler[3]} for sampler in sd_samplers.all_samplers]
 
     def get_upscalers(self):
         upscalers = []

modules/shared.py

@@ -437,6 +437,23 @@ def __getattr__(self, item):
 
         return super(Options, self).__getattribute__(item)
 
+    def set(self, key, value):
+        """sets an option and calls its onchange callback, returning True if the option changed and False otherwise"""
+
+        oldval = self.data.get(key, None)
+        if oldval == value:
+            return False
+
+        try:
+            setattr(self, key, value)
+        except RuntimeError:
+            return False
+
+        if self.data_labels[key].onchange is not None:
+            self.data_labels[key].onchange()
+
+        return True
+
     def save(self, filename):
         assert not cmd_opts.freeze_settings, "saving settings is disabled"
 

modules/ui.py

@@ -1484,16 +1484,9 @@ def run_settings(*args):
             if comp == dummy_component:
                 continue
 
-            oldval = opts.data.get(key, None)
-            try:
-                setattr(opts, key, value)
-            except RuntimeError:
-                continue
-            if oldval != value:
-                if opts.data_labels[key].onchange is not None:
-                    opts.data_labels[key].onchange()
-
+            if opts.set(key, value):
                 changed.append(key)
+
         try:
             opts.save(shared.config_filename)
         except RuntimeError:
@@ -1504,15 +1497,8 @@ def run_settings_single(value, key):
         if not opts.same_type(value, opts.data_labels[key].default):
             return gr.update(visible=True), opts.dumpjson()
 
-        oldval = opts.data.get(key, None)
-        try:
-            setattr(opts, key, value)
-        except Exception:
-            return gr.update(value=oldval), opts.dumpjson()
-
-        if oldval != value:
-            if opts.data_labels[key].onchange is not None:
-                opts.data_labels[key].onchange()
+        if not opts.set(key, value):
+            return gr.update(value=getattr(opts, key)), opts.dumpjson()
 
         opts.save(shared.config_filename)