The sources.yml file is the designated location in a dbt project to declare and configure raw data sources. By defining the source table's name (or identifier) in this central file, you decouple the raw database object from the models that reference it. When a raw object name changes, you only need to update its definition once in the sources.yml file. All models using the {{ source() }} function will automatically point to the new name without requiring any changes to the model files themselves. This approach adheres to the DRY (Don't Repeat Yourself) principle and significantly simplifies project maintenance.

A. Update the {{ source() }} function in each affected model: This is inefficient and error-prone. If a source is used in many models, you would have to manually update each file, violating the DRY principle.

C. Update the raw object names in the database: This option misinterprets the task. The goal is to adapt the dbt project to an external change, not to revert the change in the source database.

D. Create a new dbt project with the updated raw object names: This is an extreme and impractical solution. Creating an entirely new project for a simple name change is unnecessary and would create a significant maintenance burden.

1. dbt Labs Official Documentation

"Sources": "By declaring resources in your project

you can then refer to them from your models using the source function. ... This provides a clean way to refer to source tables

and it also provides a single location for describing your source data." This document establishes sources.yml as the single location for defining source tables.

2. dbt Labs Official Documentation

"Sources - Declaring a source": This section details the syntax for sources.yml

showing the identifier property. It states

"The identifier is the name of the source table in your database. If it is not provided

it will be default to the name of the source table." This confirms that the identifier field is the specific place to update the raw table name.

3. dbt Labs Official Documentation

"source function": "The source function is the primary way to reference a source table in a model. ... Using the source function also allows dbt to understand the dependencies in your project." This highlights how the function links models to the definitions in sources.yml

enabling the centralized update mechanism.