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ash_postgres
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0.1.0
The PostgreSQL data layer for Ash Framework
Current section
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Files
lib/mix/tasks/ash_postgres.rollback.ex
defmodule Mix.Tasks.AshPostgres.Rollback do
use Mix.Task
import AshPostgres.Mix.Helpers,
only: [migrations_path: 2, tenant_migrations_path: 2, tenants: 2]
@shortdoc "Rolls back the repository migrations for all repositories in the provided (or configured) domains"
@moduledoc """
Reverts applied migrations in the given repository.
Migrations are expected at "priv/YOUR_REPO/migrations" directory
of the current application but it can be configured by specifying
the `:priv` key under the repository configuration.
Runs the latest applied migration by default. To roll back to
a version number, supply `--to version_number`. To roll back a
specific number of times, use `--step n`. To undo all applied
migrations, provide `--all`.
This is only really useful if your domains only use a single repo.
If you have multiple repos and you want to run a single migration and/or
migrate/roll them back to different points, you will need to use the
ecto specific task, `mix ecto.migrate` and provide your repo name.
## Examples
mix ash_postgres.rollback
mix ash_postgres.rollback -r Custom.Repo
mix ash_postgres.rollback -n 3
mix ash_postgres.rollback --step 3
mix ash_postgres.rollback -v 20080906120000
mix ash_postgres.rollback --to 20080906120000
## Command line options
* `--domains` - the domains who's repos should be rolledback
* `--all` - revert all applied migrations
* `--step` / `-n` - revert n number of applied migrations
* `--to` / `-v` - revert all migrations down to and including version
* `--quiet` - do not log migration commands
* `--prefix` - the prefix to run migrations on
* `--pool-size` - the pool size if the repository is started only for the task (defaults to 1)
* `--log-sql` - log the raw sql migrations are running
* `--tenants` - roll back tenant migrations
* `--only-tenants` - in combo with `--tenants`, only rolls back the provided tenants, e.g `tenant1,tenant2,tenant3`
* `--except-tenants` - in combo with `--tenants`, does not rollback the provided tenants, e.g `tenant1,tenant2,tenant3`
"""
@doc false
def run(args) do
{opts, _, _} =
OptionParser.parse(args,
switches: [
all: :boolean,
step: :integer,
to: :integer,
start: :boolean,
quiet: :boolean,
prefix: :string,
pool_size: :integer,
log_sql: :boolean,
only_tenants: :string,
except_tenants: :string
],
aliases: [n: :step, v: :to]
)
repos = AshPostgres.Mix.Helpers.repos!(opts, args)
rest_opts =
args
|> AshPostgres.Mix.Helpers.delete_arg("--domains")
|> AshPostgres.Mix.Helpers.delete_arg("--migrations-path")
|> AshPostgres.Mix.Helpers.delete_flag("--tenants")
|> AshPostgres.Mix.Helpers.delete_flag("--only-tenants")
|> AshPostgres.Mix.Helpers.delete_flag("--except-tenants")
Mix.Task.reenable("ecto.rollback")
if opts[:tenants] do
for repo <- repos do
Ecto.Migrator.with_repo(repo, fn repo ->
for tenant <- tenants(repo, opts) do
rest_opts = AshPostgres.Mix.Helpers.delete_arg(rest_opts, "--prefix")
Mix.Task.run(
"ecto.rollback",
["-r", to_string(repo)] ++
rest_opts ++
["--prefix", tenant, "--migrations-path", tenant_migrations_path(opts, repo)]
)
Mix.Task.reenable("ecto.rollback")
end
end)
end
else
for repo <- repos do
Mix.Task.run(
"ecto.rollback",
["-r", to_string(repo)] ++
rest_opts ++ ["--migrations-path", migrations_path(opts, repo)]
)
Mix.Task.reenable("ecto.rollback")
end
end
end
end