What is a Jinja2 macro?

What is a Jinja2 macro?

Macros are similar to functions in many programming languages. We use them to encapsulate logic used to perform repeatable actions. Macros can take arguments or be used without them. Inside of macros we can use any of the Jinja features and constructs. Result of running macro is some text.

Which three features are included in Jinja2 template?

Some of the features of Jinja are:

• sandboxed execution.
• automatic HTML escaping to prevent cross-site scripting (XSS) attacks.
• template inheritance.
• compiles down to the optimal Python code just-in-time.
• optional ahead-of-time template compilation.

Is Jinja2 null?

The equivalent of Null in jinja2 is None, so one would expect that this one is equal: foo: ‘{{ None }}’ but it results in an empty string. This is a problem if one wants to conditionally include a property (foo in this example) into a task.

What are the delimiters used in Jinja2 template?

There are different kinds of delimiters that are defined in Jinja2.

• {% %} for conditions, expressions that will be evaluated.
• {{ }} for values to print to the template output.
• {# #} for comments not included in the template output.
• # ## for line statements.

How do you call a macro in DBT?

Usage

1. $ dbt run-operation {macro} –args {args}
2. {macro} Specify the macro to invoke. dbt will call this macro.
3. with the supplied arguments and then exit.
4. –args ARGS Supply arguments to the macro. This dictionary will be.
5. mapped to the keyword arguments defined in the.
6. selected macro.
7. eg. ‘

What are macros in DBT?

Macros are snippets of code that you can use in your dbt models like functions. In development, if we pass in an argument like “users”, the macro will simply return “users”. If production, it will prepend the table name with the schema name to return “preceden_heroku.

What does {{ NAME }} this mean in Django templates?

What does {{ name }} this mean in Django Templates? {{ name }} will be the output. It will be displayed as name in HTML. The name will be replaced with values of Python variable.

Which three of the following filters are supported in Jinja2 templates?

In addition the ones provided by Jinja2, Ansible ships with it’s own and allows users to add their own custom filters.

• Filters For Formatting Data.
• Set Theory Filters.
• Random Number Filter.
• Math.
• Hashing filters.
• Combining hashes/dictionaries.
• Extracting values from containers.
• Comment Filter.

How do I check if an array is empty in Jinja?

It is common practice in jinja and its other derivatives to test for an empty array by just writing {% if arrayname %}.

What is none in Python What does it indicate?

None is used to define a null value. It is not the same as an empty string, False, or a zero. It is a data type of the class NoneType object. Assigning a value of None to a variable is one way to reset it to its original, empty state.

How do you use variables in DBT?

dbt provides a mechanism, variables, to provide data to models for compilation. Variables can be used to configure timezones, avoid hardcoding table names or otherwise provide data to models to configure how they are compiled. To use a variable in a model, hook, or macro, use the {{ var(‘…’) }} function.

What does DBT compile do?

dbt compile generates executable SQL from source model , test , and analysis files. You can find these compiled SQL files in the target/ directory of your dbt project. The compile command is useful for: Visually inspecting the compiled output of model files.