andrewb

andrewb

Ecto migrations: is it possible to pass a variable value

Hi,

I have a multi-tenant system and I use Postgres Schemas to isolate data for each tenant. When a tenant signs up I run a set of migrations using the Migrator. I would like to create a MATERIALIZED VIEW for each Tenant that joins a table from the tenant’s schema with a public schema table.

defmodule Migrations.AddUserView do
  use Ecto.Migration

  def up do
    execute """
    CREATE MATERIALIZED VIEW users 
    AS SELECT fullname, email, email_verified, mobile, mobile_verified, roles.display 
    FROM PUBLIC.users, TENANT.tenant_users, TENANT.roles WHERE PUBLIC. users.id = 
    TENANT.tenant_users.user_id 
    AND  PUBLIC.roles.id =TENANT.tenant_users.role_id;
    """

    
  end

  def down do
    execute "DROP MATERIALIZED VIEW users;"
  end
end

To create the VIEW I need to pass the schema name to the migration so it can access the correct tables. Does anyone know if this is possible?

Regards,

Andrew

Marked As Solved

l00ker

l00ker

The prefix() function is probably what you’re looking for. Have a look at this forum thread.

Also Liked

andrewb

andrewb

Fantastic, exactly what I needed. Thanks

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