Phoenix.View.render_to_string Problem

Phoenix Forum Questions / Help
1

I try to write a minimal generator (Phoenix 1.7). Here it is:

defmodule Mix.Tasks.CopyTemplates do
  use Mix.Task

  @shortdoc "Renders .heex templates with variables and copies them to the specified directories."

  def run(_) do
    # Path to the source templates
    source_path = "priv/templates/example.gen.html/"
    app_web_path = "lib/app_web/"
    prefix = "product"

    # Define files and their respective destination paths
    file_destinations = %{
      "index.html.heex" => "#{app_web_path}/controllers/#{prefix}_html/index.html.heex"
    }

    # Variables to be inserted into the templates
    assigns = %{
      route_prefix: "/products",
      human_singular: "Product",
      human_plural: "Products",
      schema_singular: "product"
    }

    Enum.each(file_destinations, fn {source_file, dest_file} ->
      # Read the content of the source file
      template = File.read!(source_path <> source_file)

      # Render the template with the assigns using Phoenix.View
      content = Phoenix.View.render_to_string({Phoenix.View, template}, assigns)

      # Ensure the destination directory exists
      dest_dir = Path.dirname(dest_file)
      File.mkdir_p!(dest_dir)

      # Save the rendered content to the destination file
      File.write!(dest_file, content)
    end)

    IO.puts("Templates have been successfully rendered and copied!")
  end
end

When I run it I get this error:

warning: Phoenix.View.render_to_string/2 is undefined (module Phoenix.View is not available or is yet to be defined)
  lib/mix/tasks/copy_templates.ex:30

** (UndefinedFunctionError) function Phoenix.View.render_to_string/2 is undefined (module Phoenix.View is not available)

I guess the problem is content = Phoenix.View.render_to_string({Phoenix.View, template}, assigns) but how can I fix it?

2

A solution:

defmodule Mix.Tasks.CopyTemplates do
  use Mix.Task

  @shortdoc "Renders .heex templates with variables and copies them to the specified directories."

  def run(_) do
    # Path to the source templates
    source_path = "priv/templates/example.gen.html/"
    app_web_path = "lib/app_web/"
    prefix = "product"

    # Define files and their respective destination paths
    file_destinations = %{
      "index.html.heex" => "#{app_web_path}/controllers/#{prefix}_html/index.html.heex"
    }

    # Variables to be inserted into the templates
    assigns = %{
      route_prefix: "/products",
      human_singular: "Product",
      human_plural: "Products",
      schema_singular: "product"
    }

    binding = Enum.map(assigns, fn {key, value} -> {key, value} end)

    Enum.each(file_destinations, fn {source_file, dest_file} ->
      Mix.Generator.create_file(dest_file, EEx.eval_file(source_path <> source_file, binding))
    end)

    IO.puts("Templates have been successfully rendered and copied!")
  end
end