Add support for generating services

guides/overview.md

@@ -12,7 +12,7 @@ overrideable.
 
 - `Mix.Tasks.Phx.Gen.Solid.Value` - used to generate a value
 - `Mix.Tasks.Phx.Gen.Solid.Handler` - TODO
-- `Mix.Tasks.Phx.Gen.Solid.Service` - TODO
+- `Mix.Tasks.Phx.Gen.Solid.Service` - used to generate C~~R~~UD services
 - `Mix.Tasks.Phx.Gen.Solid.Finder` - TODO
 
 ## SOLID Principles

lib/mix/tasks/phx.gen.solid.service.ex

@@ -0,0 +1,73 @@
+defmodule Mix.Tasks.Phx.Gen.Solid.Service do
+  @shortdoc "Generates C~~R~~UD services for a resource"
+
+  @moduledoc """
+  Generates C~~R~~UD Services for a resource.
+
+      mix phx.gen.solid.value Accounts User users 
+
+  The first argument is the context module followed by the schema module and its
+  plural name.
+
+  This creates the following services: 
+  - `MyApp.Accounts.Service.CreateUser`
+  - `MyApp.Accounts.Service.UpdateUser`
+  - `MyApp.Accounts.Service.DeleteUser`
+
+  For more information about the generated Services, see the [Overview](overview.html).
+  """
+
+  use Mix.Task
+
+  alias Mix.Phoenix.Context
+  alias Mix.Tasks.Phx.Gen
+  alias PhxGenSolid.Generator
+
+  @switches []
+
+  @impl true
+  def run(args) do
+    if Mix.Project.umbrella?() do
+      Mix.raise("mix phx.gen.solid can only be run inside an application directory")
+    end
+
+    {opts, parsed} = OptionParser.parse!(args, strict: @switches)
+
+    # Don't pass along the opts
+    {context, schema} = Gen.Context.build(parsed, __MODULE__)
+
+    binding = [
+      context: context,
+      opts: opts,
+      schema: schema,
+      web_app_name: Generator.web_app_name(context),
+      service_create_module: build_cud_module_name(context, schema, "Create"),
+      service_update_module: build_cud_module_name(context, schema, "Update"),
+      service_delete_module: build_cud_module_name(context, schema, "Delete")
+    ]
+
+    paths = Generator.paths()
+    Generator.prompt_for_conflicts(context, &files_to_be_generated/1)
+    Generator.copy_new_files(context, binding, paths, &files_to_be_generated/1)
+  end
+
+  defp files_to_be_generated(%Context{schema: schema} = context) do
+    [
+      {:eex, "service_create.ex",
+       Path.join([context.dir, "services", "create_#{schema.singular}.ex"])},
+      {:eex, "service_update.ex",
+       Path.join([context.dir, "services", "update_#{schema.singular}.ex"])},
+      {:eex, "service_delete.ex",
+       Path.join([context.dir, "services", "delete_#{schema.singular}.ex"])}
+    ]
+  end
+
+  defp build_cud_module_name(context, schema, action) do
+    Module.concat([
+      context.base_module,
+      "#{inspect(context.alias)}",
+      "Service",
+      "#{action}#{inspect(schema.alias)}"
+    ])
+  end
+end

lib/mix/tasks/phx.gen.solid.value.ex

@@ -29,6 +29,7 @@ defmodule Mix.Tasks.Phx.Gen.Solid.Value do
 
   alias Mix.Phoenix.Context
   alias Mix.Tasks.Phx.Gen
+  alias PhxGenSolid.Generator
 
   @switches [helpers: :boolean, value_context: :string]
 
@@ -47,7 +48,7 @@ defmodule Mix.Tasks.Phx.Gen.Solid.Value do
       context: context,
       opts: opts,
       schema: schema,
-      web_app_name: web_app_name(context),
+      web_app_name: Generator.web_app_name(context),
       value_context: build_value_context(context, opts),
       value_fields: build_value_fields(schema.attrs),
       value_module:
@@ -59,12 +60,9 @@ defmodule Mix.Tasks.Phx.Gen.Solid.Value do
         ])
     ]
 
-    paths = generator_paths()
-
-    prompt_for_conflicts(context, opts)
-
-    context
-    |> copy_new_files(binding, paths)
+    paths = Generator.paths()
+    Generator.prompt_for_conflicts(context, &files_to_be_generated/2, opts)
+    Generator.copy_new_files(context, binding, paths, &files_to_be_generated/2, opts)
   end
 
   defp build_value_context(context, opts) do
@@ -82,26 +80,6 @@ defmodule Mix.Tasks.Phx.Gen.Solid.Value do
     end
   end
 
-  defp web_app_name(%Context{} = context) do
-    context.web_module
-    |> inspect()
-    |> Phoenix.Naming.underscore()
-  end
-
-  # The paths to look for template files for generators.
-  #
-  # Defaults to checking the current app's `priv` directory and falls back to
-  # phx_gen_solid's `priv` directory.
-  defp generator_paths do
-    [".", :phx_gen_solid, :phoenix]
-  end
-
-  defp prompt_for_conflicts(context, opts) do
-    context
-    |> files_to_be_generated(opts)
-    |> Mix.Phoenix.prompt_for_conflicts()
-  end
-
   defp files_to_be_generated(%Context{schema: schema} = context, opts) do
     should_gen_helpers = Keyword.get(opts, :helpers, false)
 
@@ -125,14 +103,6 @@ defmodule Mix.Tasks.Phx.Gen.Solid.Value do
   defp maybe_gen_helpers(base_files, helpers, true), do: Enum.concat(base_files, helpers)
   defp maybe_gen_helpers(base_files, _helpers, false), do: base_files
 
-  defp copy_new_files(%Context{} = context, binding, paths) do
-    opts = Keyword.get(binding, :opts)
-    files = files_to_be_generated(context, opts)
-    Mix.Phoenix.copy_from(paths, "priv/templates/phx.gen.solid", binding, files)
-
-    context
-  end
-
   defp build_value_fields(attrs) do
     Keyword.keys(attrs)
   end

lib/phx_gen_solid/generator.ex

@@ -0,0 +1,43 @@
+defmodule PhxGenSolid.Generator do
+  alias Mix.Phoenix.Context
+
+  # The paths to look for template files for generators.
+  #
+  # Defaults to checking the current app's `priv` directory and falls back to
+  # phx_gen_solid's `priv` directory.
+  def paths do
+    [".", :phx_gen_solid, :phoenix]
+  end
+
+  def web_app_name(%Context{} = context) do
+    context.web_module
+    |> inspect()
+    |> Phoenix.Naming.underscore()
+  end
+
+  def copy_new_files(%Context{} = context, binding, paths, files_fn) do
+    files = files_fn.(context)
+    Mix.Phoenix.copy_from(paths, "priv/templates/phx.gen.solid", binding, files)
+
+    context
+  end
+
+  def copy_new_files(%Context{} = context, binding, paths, files_fn, opts) do
+    files = files_fn.(context, opts)
+    Mix.Phoenix.copy_from(paths, "priv/templates/phx.gen.solid", binding, files)
+
+    context
+  end
+
+  def prompt_for_conflicts(context, files_fn) do
+    context
+    |> files_fn.()
+    |> Mix.Phoenix.prompt_for_conflicts()
+  end
+
+  def prompt_for_conflicts(context, files_fn, opts) do
+    context
+    |> files_fn.(opts)
+    |> Mix.Phoenix.prompt_for_conflicts()
+  end
+end

mix.exs

@@ -1,7 +1,7 @@
 defmodule PhxGenSolid.MixProject do
   use Mix.Project
 
-  @version "0.1.0"
+  @version "0.2.0"
 
   def project do
     [

priv/templates/phx.gen.solid/service_create.ex

@@ -0,0 +1,15 @@
+defmodule <%= inspect service_create_module %> do
+  @moduledoc """
+  Creates a <%= schema.singular %>.
+  """
+
+  alias <%= inspect context.module %>
+
+  def call(params) do 
+    params
+    |> <%= inspect context.alias %>.create_<%= schema.singular %>(params)
+    |> handle_result()
+  end 
+
+  defp handle_result(result), do: result
+end

priv/templates/phx.gen.solid/service_delete.ex

@@ -0,0 +1,15 @@
+defmodule <%= inspect service_delete_module %> do
+  @moduledoc """
+  Deletes a <%= schema.singular %>.
+  """
+
+  alias <%= inspect context.module %>
+
+  def call(params) do 
+    params
+    |> <%= inspect context.alias %>.delete_<%= schema.singular %>(params)
+    |> handle_result()
+  end 
+
+  defp handle_result(result), do: result
+end

priv/templates/phx.gen.solid/service_update.ex

@@ -0,0 +1,15 @@
+defmodule <%= inspect service_update_module %> do
+  @moduledoc """
+  Updates a <%= schema.singular %>.
+  """
+
+  alias <%= inspect context.module %>
+
+  def call(params) do 
+    params
+    |> <%= inspect context.alias %>.update_<%= schema.singular %>(params)
+    |> handle_result()
+  end 
+
+  defp handle_result(result), do: result
+end