Merge pull request #2591 from moj-analytical-services/add_modify_sett…

…ings_example_to_cookbook

add modify settings exampel to cookbook

docs/demos/examples/duckdb/cookbook.ipynb

@@ -823,6 +823,57 @@
     "first_unique_id = df.iloc[0].unique_id\n",
     "linker.evaluation.labelling_tool_for_specific_record(unique_id=first_unique_id, overwrite=True)\n"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Modifying settings after loading from a serialised `.json` model"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import splink.comparison_library as cl\n",
+    "from splink import DuckDBAPI, Linker, SettingsCreator, block_on, splink_datasets\n",
+    "\n",
+    "# setup to create a model\n",
+    "\n",
+    "db_api = DuckDBAPI()\n",
+    "\n",
+    "df = splink_datasets.fake_1000\n",
+    "\n",
+    "settings = SettingsCreator(\n",
+    "    link_type=\"dedupe_only\",\n",
+    "    comparisons=[\n",
+    "        cl.LevenshteinAtThresholds(\"first_name\"),\n",
+    "        cl.LevenshteinAtThresholds(\"surname\"),\n",
+    "\n",
+    "    ],\n",
+    "    blocking_rules_to_generate_predictions=[\n",
+    "        block_on(\"first_name\", \"dob\"),\n",
+    "        block_on(\"surname\"),\n",
+    "    ]\n",
+    ")\n",
+    "\n",
+    "linker = Linker(df, settings, db_api)\n",
+    "\n",
+    "\n",
+    "linker.misc.save_model_to_json(\"mod.json\", overwrite=True)\n",
+    "\n",
+    "new_settings = SettingsCreator.from_path_or_dict(\"mod.json\")\n",
+    "\n",
+    "new_settings.retain_intermediate_calculation_columns = True\n",
+    "new_settings.blocking_rules_to_generate_predictions = [\"1=1\"]\n",
+    "new_settings.additional_columns_to_retain = [\"cluster\"]\n",
+    "\n",
+    "linker = Linker(df, new_settings, DuckDBAPI())\n",
+    "\n",
+    "linker.inference.predict().as_duckdbpyrelation().show()"
+   ]
   }
  ],
  "metadata": {