Incremental query in DBT based on current month with Jinja - jinja2

Question

I am trying to implement a incremental query in DBT using Jinja.
Considering there are tables getting created every month in warehouse with year and month suffix and I need to write a logic to union the new table which gets created every month to execute the DBT model.
Below is the code which I have started with
#initialize the months in a list
{% set months= ['03','04','05','06','07','08','09','10','11','12','01','02'] %}
#first select query for Feb month of 2022
SELECT *, '2022-02-01' AS ref_month
FROM source_table_2022_02
#initilalize year variable to 2022
{% set year= namespace(items=2022) %}
#loop through the months to generate dynamic query for upcoming months
{% for month in months %}
#if month is Jan increment the year
{% if month == '01' %}
{% set year.items = year.items + 1 %}
{% endif %}
UNION ALL
SELECT *, '{{ year.items }}-{{ month }}-01' AS ref_month
FROM source_table_{{ year.items }}_{{ month }}
{% endfor %}
output of above logic is as below
SELECT *, '2022-02-01' AS ref_month
FROM source_table_2022_02
UNION ALL
SELECT *, '2022-03-01' AS ref_month
FROM source_table_2022_03
UNION ALL
SELECT *, '2022-04-01' AS ref_month
FROM source_table_2022_04
.
.
.
UNION ALL
SELECT *, '2023-02-01' AS ref_month
FROM source_table_2023_02
I need help in stopping the for loop when we reach the current month i.e Dec(because there is no current_month method in Jinja and I need to implement this logic in DBT models.sql file and not a python file), instead of looping through the upcoming months.
Note: as mentioned earlier the source table gets created every month with year and month suffix
I also want to continue the loop after 2023 Feb in the upcoming months. Current logic stops immediately after the list iteration ends i.e 2023 Feb

Answer 1

Would you consider installing the commonly used dbt-utils package?
If so, they have a macro called get_relations_by_pattern and another called union_relations.
These could be used to solve your problem as follows:
{% set monthly_relations = dbt_utils.get_relations_by_pattern('my_schema', 'source_table_%') %}
SELECT *
FROM {{ dbt_utils.union_relations(relations = monthly_relations) }}
Note that a new field _dbt_source_relation will be added, listing the original table name. You'll be able to parse the month and year from this.