issues: 274160723

A 500 error is raised upon clicking on the name of a table on the homepage, say http://0.0.0.0:8001/ to http://0.0.0.0:8001/test_check-c1f4771/users The API part seems to function as intended, though...

``` 2017-11-15 14:33:57 - (sanic)[ERROR]: Traceback (most recent call last): File "/usr/local/lib/python3.5/dist-packages/sanic/app.py", line 503, in handle_request response = await response File "/usr/local/lib/python3.5/dist-packages/datasette/app.py", line 155, in get return await self.view_get(request, name, hash, kwargs) File "/usr/local/lib/python3.5/dist-packages/datasette/app.py", line 219, in view_get context, File "/usr/local/lib/python3.5/dist-packages/sanic_jinja2/init.py", line 84, in render return html(self.render_string(template, request, context)) File "/usr/local/lib/python3.5/dist-packages/sanic_jinja2/init.py", line 81, in render_string return self.env.get_template(template).render(context) File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 812, in get_template return self._load_template(name, self.make_globals(globals)) File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 786, in _load_template template = self.loader.load(self, name, globals) File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load code = environment.compile(source, name, filename) File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 565, in compile self.handle_exception(exc_info, source_hint=source_hint) File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 754, in handle_exception reraise(exc_type, exc_value, tb) File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise raise value.with_traceback(tb) File "/usr/local/lib/python3.5/dist-packages/datasette/templates/table.html", line 29, in template

params = {{ query.params|tojson(4) }}

File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 515, in _generate return generate(source, self, name, filename, defer_init=defer_init) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 62, in generate generator.visit(node) File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit return f(node, args, kwargs) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 849, in visit_Template self.blockvisit(block.body, block_frame) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 492, in blockvisit self.visit(node, frame) File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit return f(node, args, kwargs) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1172, in visit_If self.blockvisit(node.body, if_frame) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 492, in blockvisit self.visit(node, frame) File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit return f(node, *args, kwargs) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1353, in visit_Output self.visit(argument, frame) File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit return f(node, args, *kwargs) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1565, in visit_Filter self.fail('no filter named %r' % node.name, node.lineno) File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 427, in fail raise TemplateAssertionError(msg, lineno, self.name, self.filename) jinja2.exceptions.TemplateAssertionError: no filter named 'tojson'

2017-11-15 14:33:57 - (network)[INFO][127.0.0.1:41316]: GET http://0.0.0.0:8001/test_check-c1f4771/users 500 144 2017-11-15 14:33:57 - (network)[INFO][127.0.0.1:41316]: GET http://0.0.0.0:8001/favicon.ico 200 0 ```