Test your changes with Lightdash compile

If you've connected Lightdash to GitHub, you can setup a github action and get Lightdash to compile your project and test your changes whenever you open a pull request.

Adding this Lightdash compile action will compile your dbt project's .yml files and check to see if there are any errors that will break your Lightdash project. For example, a metric that references a dimension that doesn't exist.

Step 1: add the credentials to Github secrets

We are going to add some secrets and config to GitHub actions, but you don't want those to be public, so the best way to do this is to add them as secrets on Github.

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If you already have a GitHub action for Lightdash, then you can use the same Lightdash secrets you created for your other action.

Go to your repo, click on Settings , on the left sidebar, click on Secrets under Security. Now click on the New repository secret

We need to add the following secrets:

`LIGHTDASH_API_KEY`

Create a new personal access token, by going to Settings > Personal Access Tokens. This is the token you'll put in for LIGHTDASH_API_KEY.

`LIGHTDASH_PROJECT`

The UUID for your project. For example, if your URL looks like https://eu1.lightdash.cloud/projects/3538ab33-dc90-aabb-bc00-e50bba3a5f69/tables, then 3538ab33-dc90-45f0-aabb-e50bba3a5f69 is your LIGHTDASH_PROJECT

`LIGHTDASH_URL`

This is either https://eu1.lightdash.cloud or https://app.lightdash.cloud for Lightdash Cloud users (check the URL to your Lightdash project). If you self-host, this should be your own custom domain.

`DBT_PROFILES`

Some tips for this bit:

You might be able to copy a bunch of the information from your local profiles.yml file. You can see what's in there by typing cat ~/.dbt/profiles.yml in your terminal.
If you have a separate prod and dev profile, you probably want to use the information from your prod profile for your GitHub action.
If you want to have different connection settings depending on the user that opened the pull request (dev profiles), then check out this guide.

Find your data warehouse from the list below to get a profiles.yml file template. Fill out this template, and this is your DBT_PROFILES secret.

BigQuery

BigQuery OAuth:

Step 1: create a secret called GOOGLE_APPLICATION_CREDENTIALS

Add the service account credentials (the JSON file) that you want to use for your GitHub action. It should look something like this:

{
  "type": "service_account",
  "project_id": "jaffle_shop",
  "private_key_id": "12345",
  "private_key": "-----BEGIN PRIVATE KEY----- ... -----END PRIVATE KEY-----\n",
  "client_email": "jaffle_shop@jaffle_shop.iam.gserviceaccount.com",
  "client_id": "12345",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/jaffle_shop"
}

Step 2: create another secret called DBT_PROFILES

Copy-paste this template into the secret and fill out the details.

This will always use this project connection in your GitHub actions. If you want your preview projects to have different connection settings depending on the user that opened the pull request (dev profiles), then see what you need to add to your secret in this guide.

[my-bigquery-db]: # this is the name of your project
  target: dev
  outputs:
    dev:
      type: bigquery
      method: oauth
      keyfile: keyfile.json # no need to change this! We'll automatically use the keyfile you created in the last step.
      project: [GCP project id]
      dataset: [the name of your dbt dataset]

More info in dbt's profiles docs: https://docs.getdbt.com/reference/warehouse-profiles/bigquery-profile#service-account-file

Postgres

Postgres profile configuration:

company-name:
  target: dev
  outputs:
    dev:
      type: postgres
      host: [hostname]
      user: [username]
      password: [password]
      port: [port]
      dbname: [database name]
      schema: [dbt schema]
      threads: [1 or more]
      keepalives_idle: 0
      connect_timeout: 10
      retries: 1

More info in dbt's profiles docs: https://docs.getdbt.com/reference/warehouse-profiles/postgres-profile#profile-configuration

Redshift

Redshift password-based authentication:

company-name:
  target: dev
  outputs:
    dev:
      type: redshift
      host: [hostname.region.redshift.amazonaws.com]
      user: [username]
      password: [password]
      port: 5439
      dbname: analytics
      schema: analytics
      threads: 4
      keepalives_idle: 240
      connect_timeout: 10
      ra3_node: true # enables cross-database sources

More info in dbt's profiles docs: https://docs.getdbt.com/reference/warehouse-profiles/redshift-profile#password-based-authentication

Snowflake

User / Password authentication:

my-snowflake-db:
  target: dev
  outputs:
    dev:
      type: snowflake
      account: [account id]

      # User/password auth
      user: [username]
      password: [password]

      role: [user role]
      database: [database name]
      warehouse: [warehouse name]
      schema: [dbt schema]
      threads: [1 or more]
      client_session_keep_alive: False
      query_tag: [anything]

More info in dbt's profiles docs: https://docs.getdbt.com/reference/warehouse-profiles/snowflake-profile#user--password-authentication

DataBricks

Set up a DataBricks target:

your_profile_name:
  target: dev
  outputs:
    dev:
      type: databricks
      catalog:
        [
          optional catalog name,
          if you are using Unity Catalog,
          only available in dbt-databricks>=1.1.1,
        ]
      schema: [schema name]
      host: [yourorg.databrickshost.com]
      http_path: [/sql/your/http/path]
      token: [dapiXXXXXXXXXXXXXXXXXXXXXXX] # Personal Access Token (PAT)
      threads: [1 or more]

More info in dbt's profiles docs: https://docs.getdbt.com/reference/warehouse-profiles/bigquery-profile#service-account-json

Step 2: Create deploy.yml workflow in Github

Go to your repo, click on Actions menu.

If you don't have any GitHub actions, you'll just need to click on Configure

Github actions page

If you have some GitHub actions in your repo already, click on New workflow, then select setup a workflow yourself.

Now copy this file from our cli-actions repo.

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If you only use a subset of your dbt models in Lightdash, then you'll want to specify that subset in your file here. For example, to only compile models with the tag lightdash, you would change this line to: run: lightdash compile --select tag:lightdash --project-dir "$PROJECT_DIR" --profiles-dir . --profile prod || lightdash compile --select tag:lightdash --project-dir "$PROJECT_DIR" --profiles-dir .

Give it a nice name like compile-lightdash.yml

And commit this to your repo by clicking on Start commit.

You're done!

Everytime you open a new pull request on the repository that contains your Lightdash project, lightdash compile will run and check to see if any of the changes you made will break your Lightdash instance.

You can see the log on the Github actions page

Test your changes with Lightdash compile

Step 1: add the credentials to Github secrets​

LIGHTDASH_API_KEY​

LIGHTDASH_PROJECT​

LIGHTDASH_URL​

DBT_PROFILES​

Step 2: Create deploy.yml workflow in Github​

You're done!​