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SQL-based adapters for Ecto and database migrations
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lib/mix/tasks/ecto.load.ex
defmodule Mix.Tasks.Ecto.Load do
use Mix.Task
import Mix.Ecto
import Mix.EctoSQL
@shortdoc "Loads previously dumped database structure"
@default_opts [force: false, quiet: false]
@aliases [
d: :dump_path,
f: :force,
q: :quiet
]
@switches [
dump_path: :string,
force: :boolean,
quiet: :boolean
]
@moduledoc """
Loads the current environment's database structure for the
given repository from a previously dumped structure file.
The repository must be set under `:ecto_repos` in the
current app configuration or given via the `-r` option.
This task needs some shell utility to be present on the machine
running the task.
Database | Utility needed
:--------- | :-------------
PostgreSQL | psql
MySQL | mysql
## Example
mix ecto.load
## Command line options
* `-r`, `--repo` - the repo to load the structure info into
* `-d`, `--dump-path` - the path of the dump file to load from
* `-q`, `--quiet` - run the command quietly
* `-f`, `--force` - do not ask for confirmation when loading data.
Configuration is asked only when `:start_permanent` is set to true
(typically in production)
"""
def run(args) do
{opts, _, _} =
OptionParser.parse args, switches: @switches, aliases: @aliases
opts = Keyword.merge(@default_opts, opts)
Enum.each parse_repo(args), fn repo ->
ensure_repo(repo, args)
ensure_implements(repo.__adapter__, Ecto.Adapter.Structure,
"load structure for #{inspect repo}")
if skip_safety_warnings?() or
opts[:force] or
Mix.shell.yes?("Are you sure you want to load a new structure for #{inspect repo}? Any existing data in this repo may be lost.") do
load_structure(repo, opts)
end
end
end
defp skip_safety_warnings? do
Mix.Project.config[:start_permanent] != true
end
defp load_structure(repo, opts) do
config = Keyword.merge(repo.config, opts)
case repo.__adapter__.structure_load(source_repo_priv(repo), config) do
{:ok, location} ->
unless opts[:quiet] do
Mix.shell.info "The structure for #{inspect repo} has been loaded from #{location}"
end
{:error, term} when is_binary(term) ->
Mix.raise "The structure for #{inspect repo} couldn't be loaded: #{term}"
{:error, term} ->
Mix.raise "The structure for #{inspect repo} couldn't be loaded: #{inspect term}"
end
end
end