dbt render macro 简单说明
dbt render macro 官方文档并没有说明，但是在一些三方adapter 中发现有使用到简单说明下
参考使用
{% materialization external, adapter="duckdb", supported_languages=['sql', 'python'] %}
{%- set location = render(config.get('location', default=external_location(this, config))) -%})
{%- set rendered_options = render_write_options(config) -%}
内部处理
- context 定义
@contextmember
def render(self, string: str) -> str:
return get_rendered(string, self._ctx, self.model)
- get_rendered 处理
可以看到内部实际上是一个jinja2 的处理
def get_rendered(
string: str,
ctx: Dict[str, Any],
node=None,
capture_macros: bool = False,
native: bool = False,
) -> str:
# performance optimization: if there are no jinja control characters in the
# string, we can just return the input. Fall back to jinja if the type is
# not a string or if native rendering is enabled (so '1' -> 1, etc...)
# If this is desirable in the native env as well, we could handle the
# native=True case by passing the input string to ast.literal_eval, like
# the native renderer does.
if not native and isinstance(string, str) and _HAS_RENDER_CHARS_PAT.search(string) is None:
return string
template = get_template(
string,
ctx,
node,
capture_macros=capture_macros,
native=native,
)
return render_template(template, ctx, node)
说明
render macro 官方没有说明，但是从功能上看似乎是一个很强大的macro，可以实现macro 再调用处理,如下
{% set location = "{{this}}" %}
{{log("render info " ~ render(location),info=True) }}
select * from {{myref('pg','sensor')}}
