DateDataSource

Data source class for populating date parameter options from a database table or query. This class can be imported from the squirrels.data_sources or the squirrels module.

Constructor

Creates a DateDataSource object.

def __init__(
    self, table_or_query: str, default_date_col: str, 
    *, min_date_col: str | None = None, max_date_col: str | None = None, 
    date_format: str = '%Y-%m-%d', id_col: str | None = None, 
    source: SourceEnum = SourceEnum.CONNECTION, 
    user_group_col: str | None = None, parent_id_col: str | None = None, 
    connection: str | None = None
) -> None:

Hide arguments

str

required

Either the name of the table to use, or a SQL query to run. If using a SQL query, it must start with “SELECT” (ignoring case and leading whitespaces) followed by a whitespace.The available tables are based on the source argument. If the source is SourceEnum.CONNECTION, then the SQL syntax is based on the underlying database from the connection argument. Otherwise, the SQL syntax is DuckDB SQL.

str

required

The column name for the default date.

str | None

default:"None"

The column name for the minimum date. If None, then there is no minimum date constraint.

str | None

default:"None"

The column name for the maximum date. If None, then there is no maximum date constraint.

str

default:"'%Y-%m-%d'"

Format of the dates in the columns. Uses Python’s strftime format codes (e.g., %Y-%m-%d for ISO format, %m/%d/%Y for US format).

SourceEnum

default:"SourceEnum.CONNECTION"

The source to fetch data from as a SourceEnum value.

str | None

default:"None"

The column name of the user group for option visibility. If None, all users will see all options.

str | None

default:"None"

The column name of the parent option id for cascading.If None, then this parameter has no parent and its options will not be cascaded.

str | None

default:"None"

Name of the connection to use. Only used if the source is SourceEnum.CONNECTION. Connection must be defined in squirrels.yml or the connections.py file.If None, uses the default connection (specified by SQRL_CONNECTIONS__DEFAULT_NAME_USED environment variable or ‘default’).

Examples

A DateDataSource object is created in the pyconfigs/parameters.py file. It must be created in a function decorated with the create_from_source factory method from DateParameter.

Usage example in parameters.py

from squirrels import parameters as p, data_sources as ds

@p.DateParameter.create_from_source(
    name="report_date", 
    label="Report Date",
    description="Date to generate the report for"
)
def report_date_source():
    return ds.DateDataSource(
        table_or_query="""
            SELECT 
                CURRENT_DATE AS default_date,
                CURRENT_DATE - INTERVAL '1 year' AS min_date,
                CURRENT_DATE AS max_date
        """,
        default_date_col="default_date",
        min_date_col="min_date",
        max_date_col="max_date"
    )

In addition, the following are some additional examples for creating a DateDataSource object.

Using a table from a specific connection

This example uses a table called “fiscal_calendar” from the “analytics_db” connection.

ds.DateDataSource(
    table_or_query="fiscal_calendar",
    default_date_col="reporting_date",
    min_date_col="period_start",
    max_date_col="period_end",
    connection="analytics_db"
)

The connection must either be defined in squirrels.yml or the connections.py file.

Using seeds as the data source

This example uses a seed file called “date_config”.

ds.DateDataSource(
    table_or_query="date_config",
    default_date_col="default_date",
    source=ds.SourceEnum.SEEDS
)

Using a custom date format

This example demonstrates using a different date format for the dates stored in the database.

ds.DateRangeDataSource(
    table_or_query="""
        SELECT '01/31/2025' AS default_date
    """,
    default_date_col="default_date",
    date_format="%m/%d/%Y"
)

Enabling cascading effects with a parent parameter

In this example, the default, minimum, and maximum dates are determined by the selected value of another parameter called “region”.

@p.DateParameter.create_from_source(
    name="availability_date", 
    label="Availability Date",
    description="The date of availability for the selected region",
    parent_name="region"
)
def report_date_source():
    return ds.DateDataSource(
      table_or_query="regional_availability",
      default_date_col="availability_date",
      min_date_col="earliest_date",
      max_date_col="latest_date",
      parent_id_col="region_id"  # Cascades based on region selection
  )

arguments

auth

connections

parameters

parameter_options

data_sources

dashboards

types

Constructor

Examples

Usage example in parameters.py

Using a table from a specific connection

Using seeds as the data source

Using a custom date format

Enabling cascading effects with a parent parameter

​Constructor

​Examples

​Usage example in parameters.py

​Using a table from a specific connection

​Using seeds as the data source

​Using a custom date format

​Enabling cascading effects with a parent parameter

Constructor

Examples

Usage example in parameters.py

Using a table from a specific connection

Using seeds as the data source

Using a custom date format

Enabling cascading effects with a parent parameter