Could not build url for endpoint 'dcat.read_catalog'

[student2017USA]

After installing ckanext-dcat, i enabled it in ckan.ini by adding following in ckan.plugins

dcat dcat_json_harvester dcat_json_interface structured_data

and added following 2 lines

ckanext.dcat.enable_rdf_endpoints = False
ckanext.dcat.catalog_endpoint = /dcat/catalog/{_format}

Now when i go to dataset page, i am gettig error - "Internal server error"

In the console, i get following error

2022-08-16 19:56:20,313 ERROR [ckan.config.middleware.flask_app] Could not build url for endpoint 'dcat.read_catalog' with values ['_format']. Did you mean 'dataset.read' instead?
Traceback (most recent call last):
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/lib/ckan/default/src/ckan/ckan/config/middleware/../../views/dataset.py", line 376, in search
    _get_pkg_template(u'search_template', package_type), extra_vars
  File "/usr/lib/ckan/default/src/ckan/ckan/lib/base.py", line 151, in render
    return flask_render_template(template_name, **extra_vars)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/templating.py", line 140, in render_template
    ctx.app,
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/templating.py", line 120, in _render
    rv = template.render(context)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/usr/lib/ckan/default/src/ckanext-dcat/ckanext/dcat/plugins/../templates/package/search.html", line 1, in top-level template code
    {% ckan_extends %}
  File "/usr/lib/ckan/default/src/ckan/ckan/templates/package/search.html", line 2, in top-level template code
    {% import 'macros/form.html' as form %}
  File "/usr/lib/ckan/default/src/ckan/ckan/templates/page.html", line 1, in top-level template code
    {% extends "base.html" %}
  File "/usr/lib/ckan/default/src/ckanext-harvest/ckanext/harvest/plugin/../templates/base.html", line 1, in top-level template code
    {% ckan_extends %}
  File "/usr/lib/ckan/default/ckanext-visualize/ckanext/visualize/templates/base.html", line 1, in top-level template code
    <!--
  File "/usr/lib/ckan/default/src/ckanext-scheming/ckanext/scheming/templates/base.html", line 1, in top-level template code
    {% ckan_extends %}
  File "/usr/lib/ckan/default/src/ckan/ckan/templates/base.html", line 52, in top-level template code
    {% block links -%}
  File "/usr/lib/ckan/default/src/ckanext-dcat/ckanext/dcat/plugins/../templates/package/search.html", line 5, in block "links"
    <link rel="alternate" type="text/n3" href="{{ h.url_for(endpoint, _format='n3', _external=True) }}"/>
  File "/usr/lib/ckan/default/src/ckan/ckan/lib/helpers.py", line 353, in url_for
    my_url = _url_for_flask(*args, **kw)
  File "/usr/lib/ckan/default/src/ckan/ckan/lib/helpers.py", line 415, in _url_for_flask
    my_url = _flask_default_url_for(*args, **kw)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/helpers.py", line 370, in url_for
    return appctx.app.handle_url_build_error(error, endpoint, values)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/app.py", line 2215, in handle_url_build_error
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/flask/helpers.py", line 358, in url_for
    endpoint, values, method=method, force_external=external
  File "/usr/lib/ckan/default/lib/python3.6/site-packages/werkzeug/routing.py", line 2179, in build
    raise BuildError(endpoint, values, method, self)
werkzeug.routing.BuildError: Could not build url for endpoint 'dcat.read_catalog' with values ['_format']. Did you mean 'dataset.read' instead?

[filos1983]

Hello @student2017USA, I've the same issue. Have you found a solution? I cannot figure what's going wrong

Thanks!

[seitenbau-govdata]

when i go to dataset page

@student2017USA What exactly do you mean with that? Can you provide an example URL?
Does it work with the following setting
ckanext.dcat.enable_rdf_endpoints = True

[seitenbau-govdata]

Hello @student2017USA, I've the same issue. Have you found a solution? I cannot figure what's going wrong

Thanks!

Hi @filos1983 Can you provide some more information about what you have tried?

[filos1983]

Hello @seitenbau-govdata, thanks for your help. I'm trying to install DCAT extension in CKAN 2.9 but, as Student2017Usa described in his post, the Dataset page gave me "Internal server error" when I add dcat dcat_json_harvester dcat_json_interface structured_data in ckan.plugins.
In logs the error message was

File "/usr/lib/ckan/default/lib/python3.6/site-packages/werkzeug/routing.py", line 2179, in build
  raise BuildError(endpoint, values, method, self)
werkzeug.routing.BuildError: Could not build url for endpoint 'dcat.read_catalog' with values ['_format']. Did you mean 'dataset.read' instead?

According with your suggestion, I've inserted the line

ckanext.dcat.enable_rdf_endpoints = True

in my ckan.ini file and now it works.

Thank you very much

[amercader]

The problem is that the plugin tries to create the URL for the endpoints in the templates even if the routes are not registered in the blueprint (because ckanext.dcat.enable_rdf_endpoints = False). I've created #259 to fix this