Jinja Template for dynamic conditions

[Keveen-ghori]

I want to use jinja template and want to dynamically apply parameters in query and want to save query as dataset.

Let me explain complete scenario:

I have MV that contains all data of different meter type, but I want to dashboard that contains different tabs with different meter types. So, I am creating a dataset for that dashboard, but for each meter types i have to create datasets. Is there any way to use single dataset that dynamically add WHERE condition in each tabs?

Here is the query that i am currently trying:

            SELECT bucket,
                   meter_id,
                   meter_channel_id, timestamp, status,
                                                nem12_status,
                                                meter_type,
                                                channel_type,
                                                unit_of_measurement,
                                                meter_property_name,
                                                customer_name,
                                                site_name,
                                                physical_time_zone,
                                                channel_name,
                                                CASE
                                                    WHEN channel_type = 'Interval' THEN value
                                                    WHEN channel_type = 'Cumulative' THEN COALESCE((value - COALESCE(LAG(value) OVER (PARTITION BY meter_id, meter_channel_id
                                                                                                                                      ORDER BY bucket), 0))::double precision, 0)
                                                    ELSE value
                                                END AS calculated_value
            FROM meter_channel_data_daily
            WHERE bucket BETWEEN '{{ from_dttm }}' AND '{{ to_dttm }}'
              AND meter_type = '{{ meter_type }}';

Help me to find solution related to this case that i am thinking to implement.

If there is any alternative then also please suggest.

Here, I want to ask is it best practice to use more dataset in a dashboard? or it is good to use one dataset in entire dashboard.

[dosubot[bot]]

Hey @Keveen-ghori! 👋 I'm here to help you with any bugs, questions, or contributions you have. Let's squash those bugs together!

To achieve dynamic filtering in a single dataset using Jinja templates, you can leverage the Jinja templating capabilities in Apache Superset. This allows you to create a flexible dataset that can adapt to different conditions, such as meter types, without needing to create separate datasets for each type.

Here's how you can implement this:

1. Enable Jinja Templating: Ensure that the ENABLE_TEMPLATE_PROCESSING feature flag is enabled in your superset_config.py file. This allows you to use Jinja templates in your SQL queries.

2. Use Jinja Variables: In your SQL query, use Jinja variables to dynamically apply conditions. For example, you can use the {{ meter_type }} variable to filter by meter type. You can pass this variable as a parameter when you load the dashboard or use URL parameters to set it dynamically.

3. Dynamic WHERE Clause: Modify your query to include a dynamic WHERE clause using Jinja templating. Here's an example based on your query:

   SELECT bucket,
          meter_id,
          meter_channel_id, timestamp, status,
          nem12_status,
          meter_type,
          channel_type,
          unit_of_measurement,
          meter_property_name,
          customer_name,
          site_name,
          physical_time_zone,
          channel_name,
          CASE
              WHEN channel_type = 'Interval' THEN value
              WHEN channel_type = 'Cumulative' THEN COALESCE((value - COALESCE(LAG(value) OVER (PARTITION BY meter_id, meter_channel_id
                                                                                              ORDER BY bucket), 0))::double precision, 0)
              ELSE value
          END AS calculated_value
   FROM meter_channel_data_daily
   WHERE bucket BETWEEN '{{ from_dttm }}' AND '{{ to_dttm }}'
     {% if meter_type is not none %}
     AND meter_type = '{{ meter_type }}'
     {% endif %}

4. Pass Parameters: You can pass parameters to your dashboard using URL parameters or by setting default values in the chart metadata. This allows you to dynamically change the meter_type based on user input or dashboard configuration.

Regarding the best practice of using multiple datasets versus a single dataset, it generally depends on your specific use case and performance considerations. Using a single dataset with dynamic filtering can simplify maintenance and reduce redundancy, but it may have performance implications if the dataset is large and complex. It's important to test and monitor performance to ensure it meets your needs ^[1][2].

To continue talking to Dosu, mention @dosu.

[dosubot[bot]]

To apply a dynamic condition for each tab in your Superset dashboard, you can use Jinja templating along with URL parameters to set different meter_type filters for each tab. Here's how you can configure it:

1. Use URL Parameters for Each Tab: You can set different URL parameters for each tab in your dashboard. For example, if you have a tab for each meter_type, you can create URLs like:

   • Tab 1: http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type1
   • Tab 2: http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type2

2. Access URL Parameters in SQL Queries: In your SQL query, use the url_param function to access the meter_type parameter. This allows the query to dynamically filter data based on the tab's URL parameter:

   SELECT ...
   FROM your_table
   WHERE ...
     AND meter_type = '{{ url_param('meter_type', 'default_value') }}'

3. Set Default Values (Optional): If you want to ensure a default value is used when no URL parameter is provided, you can set it in the chart's metadata or directly in the url_param function as shown above.

By configuring your dashboard and queries this way, each tab can display data filtered by a different meter_type, providing a dynamic and interactive experience.

To continue talking to Dosu, mention @dosu.

[Keveen-ghori]

How can i set URL Parameters for Each Tab?

[dosubot[bot]]

To set URL parameters for each tab in your Superset dashboard, you can follow these steps:

1. Create Unique URLs for Each Tab: Assign a unique URL with specific parameters for each tab. For example, if you have tabs for different meter_type values, you can create URLs like:

   • Tab 1: http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type1
   • Tab 2: http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type2

2. Use URL Parameters in SQL Queries: In your SQL queries, use the url_param function to access these parameters. This allows the query to dynamically filter data based on the URL parameter:

   SELECT ...
   FROM your_table
   WHERE ...
     AND meter_type = '{{ url_param('meter_type', 'default_value') }}'

3. Configure Dashboard Navigation: Ensure that the navigation or links to each tab use the corresponding URL with the appropriate parameters. This way, when a user clicks on a tab, the URL parameters are passed, and the data is filtered accordingly.

By setting up your dashboard and queries in this manner, each tab can display data filtered by different meter_type values, providing a tailored view for each tab.

To continue talking to Dosu, mention @dosu.

[Keveen-ghori]

Where i can configure tabs URL in dashboard. @dosu

[dosubot[bot]]

In Apache Superset, you can configure the URLs for tabs in a dashboard by manually setting up the navigation links to include specific URL parameters. This is typically done outside of Superset's built-in interface, as Superset does not provide a direct feature to configure tab-specific URLs within the dashboard editor itself.

To achieve this, you can:

1. Manually Create Links: Use external links or buttons that direct users to the specific tab URLs with the desired parameters. For example, you can create HTML links or buttons in a markdown component within the dashboard that point to URLs like:

   • http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type1
   • http://your-superset-url/superset/dashboard/your-dashboard-id/?meter_type=type2

2. Use Jinja or JavaScript: If you have the ability to inject custom HTML or JavaScript, you can dynamically generate these links based on user interactions or other conditions.

3. External Documentation or Portals: If your dashboard is part of a larger application or portal, you can manage navigation through that system, ensuring that each tab link includes the appropriate URL parameters.

By setting up your navigation in this way, you can control which parameters are passed to each tab, allowing for dynamic filtering and customization of the dashboard content based on the selected tab.

To continue talking to Dosu, mention @dosu.