{"id": "plugin_hooks:plugin-hook-jinja2-environment-from-request", "page": "plugin_hooks", "ref": "plugin-hook-jinja2-environment-from-request", "title": "jinja2_environment_from_request(datasette, request, env)", "content": "datasette  -  Datasette class \n                     \n                         A Datasette instance. \n                     \n                 \n                 \n                     request  -  Request object  or  None \n                     \n                         The current HTTP request, if one is available. \n                     \n                 \n                 \n                     env  -  Environment \n                     \n                         The Jinja2 environment that will be used to render the current page. \n                     \n                 \n             \n             This hook can be used to return a customized  Jinja environment  based on the incoming request. \n             If you want to run a single Datasette instance that serves different content for different domains, you can do so like this: \n             from datasette import hookimpl\nfrom jinja2 import ChoiceLoader, FileSystemLoader\n\n\n@hookimpl\ndef jinja2_environment_from_request(request, env):\n    if request and request.host == \"www.niche-museums.com\":\n        return env.overlay(\n            loader=ChoiceLoader(\n                [\n                    FileSystemLoader(\n                        \"/mnt/niche-museums/templates\"\n                    ),\n                    env.loader,\n                ]\n            ),\n            enable_async=True,\n        )\n    return env \n             This uses the Jinja  overlay() method  to create a new environment identical to the default environment except for having a different template loader, which first looks in the  /mnt/niche-museums/templates  directory before falling back on the default loader.", "breadcrumbs": "[\"Plugin hooks\"]", "references": "[{\"href\": \"https://jinja.palletsprojects.com/en/3.0.x/api/#jinja2.Environment\", \"label\": \"Jinja environment\"}, {\"href\": \"https://jinja.palletsprojects.com/en/3.0.x/api/#jinja2.Environment.overlay\", \"label\": \"overlay() method\"}]"}