introduce option validation for all backpex fields

demo/lib/demo_web/live/short_link_live.ex

@@ -47,7 +47,6 @@ defmodule DemoWeb.ShortLinkLive do
       product: %{
         module: Backpex.Fields.BelongsTo,
         label: "Product",
-        source: Demo.Product,
         display_field: :name,
         prompt: "Choose product..."
       }

guides/fields/custom-fields.md

@@ -13,7 +13,7 @@ When creating your own custom field, you can use the `field` macro from the `Bac
 The simplest version of a custom field would look like this:
 
 ```elixir
-use BackpexWeb, :field
+use Backpex.Field
 
 @impl Backpex.Field
 def render_value(assigns) do

guides/upgrading/v0.9.md

@@ -70,3 +70,30 @@ end
 
 Although the change is relatively small, if you are using public functions of the `Backpex.LiveResource` directly,
 check the updated function definitions in the module documentation.
+
+## Refactor custom fields
+
+In case you built your own custom fields: We changed the way how to use the `Backpex.Field`.
+
+Before:
+
+```elixir
+  use BackpexWeb, :field
+```
+
+After:
+
+```elixir
+  use Backpex.Field
+```
+
+In case your field has field-specific configuration options, you need to provide those when using `Backpex.Field`:
+
+```elixir
+  @config_schema [
+    # see https://hexdocs.pm/nimble_options/NimbleOptions.html
+    # or any other core backpex field for examples...
+  ]
+
+  use Backpex.Field, config_schema: @config_schema
+```

lib/backpex/adapters/ecto.ex

@@ -343,7 +343,7 @@ defmodule Backpex.Adapters.Ecto do
   end
 
   defp record_query(id, schema, item_query, live_resource) do
-    fields = live_resource.fields()
+    fields = live_resource.validated_fields()
     schema_name = name_by_schema(schema)
     primary_key = live_resource.config(:primary_key)
     primary_type = schema.__schema__(:type, primary_key)

lib/backpex/field.ex

@@ -1,9 +1,109 @@
 # credo:disable-for-this-file Credo.Check.Refactor.CyclomaticComplexity
 defmodule Backpex.Field do
-  @moduledoc ~S'''
+  @config_schema [
+    module: [
+      doc: "The field module.",
+      type: :atom,
+      required: true
+    ],
+    label: [
+      doc: "The field label.",
+      type: :string,
+      required: true
+    ],
+    render: [
+      doc: "A function to overwrite the template used . It should take `assigns` and return a HEEX template.",
+      type: {:fun, 1}
+    ],
+    render_form: [
+      doc: "A function to overwrite the template used in forms. It should take `assigns` and return a HEEX template.",
+      type: {:fun, 1}
+    ],
+    custom_alias: [
+      doc: "A custom alias for the field.",
+      type: :atom
+    ],
+    align: [
+      doc: "Align the fields of a resource in the index view.",
+      type: {:in, [:left, :center, :right]}
+    ],
+    align_label: [
+      doc: "Align the labels of the fields in the edit view.",
+      type: {:in, [:top, :center, :bottom]}
+    ],
+    searchable: [
+      doc: "Define wether this field should be searchable on the index view.",
+      type: :boolean
+    ],
+    orderable: [
+      doc: "Define wether this field should be orderable on the index view.",
+      type: :boolean
+    ],
+    visible: [
+      doc: "Function to change the visibility of a field. Receives the assigns and has to return a boolean.",
+      type: {:fun, 1}
+    ],
+    panel: [
+      doc: "Group field into panel. Also see the [panels](/guides/authorization/panels.md) guide.",
+      type: :atom
+    ],
+    index_editable: [
+      doc: """
+      Define wether this field should be editable on the index view. Also see the
+      [index edit](/guides/authorization/index-edit.md) guide.
+      """,
+      type: :boolean
+    ],
+    index_column_class: [
+      doc: """
+      Add additional class(es) to the index column.
+      In case of a function it takes the `assigns` and should return a string.
+      """,
+      type: {:or, [:string, {:fun, 1}]}
+    ],
+    select: [
+      doc: """
+      Define a dynamic select query expression for this field.
+
+      ### Example
+
+          full_name: %{
+            module: Backpex.Fields.Text,
+            label: "Full Name",
+            select: dynamic([user: u], fragment("concat(?, ' ', ?)", u.first_name, u.last_name)),
+          }
+      """,
+      type: {:struct, Ecto.Query.DynamicExpr}
+    ],
+    only: [
+      doc: "Define the only views where this field should be visible.",
+      type: {:list, {:in, [:new, :edit, :show, :index, :resource_action]}}
+    ],
+    except: [
+      doc: "Define the views where this field should not be visible.",
+      type: {:list, {:in, [:new, :edit, :show, :index, :resource_action]}}
+    ],
+    translate_error: [
+      doc: """
+      Function to customize error messages for a field. The function receives the error tuple and must return a tuple
+      with the message and metadata.
+      """,
+      type: {:fun, 1}
+    ]
+  ]
+
+  @moduledoc """
   Behaviour implemented by all fields.
 
-  A field defines how a column is rendered on index, show and edit views. In the resource configuration file you can configure a list of fields. You may create your own field by implementing this behaviour. A field has to be a [LiveComponent](https://hexdocs.pm/phoenix_live_view/Phoenix.LiveComponent.html).
+  A field defines how a column is rendered on index, show and edit views. In the resource configuration file you can
+  configure a list of fields. You may create your own field by implementing this behaviour. A field has to be a
+  [LiveComponent](https://hexdocs.pm/phoenix_live_view/Phoenix.LiveComponent.html).
+
+  ### Options
+
+  These are general field options which can be used on every field. Check the field modules for field-specific options.
+
+  #{NimbleOptions.docs(@config_schema)}
 
   ### Example
 
@@ -15,7 +115,7 @@ defmodule Backpex.Field do
           }
         ]
       end
-  '''
+  """
   import Phoenix.Component, only: [assign: 3]
 
   @doc """
@@ -97,13 +197,38 @@ defmodule Backpex.Field do
 
   @optional_callbacks render_form_readonly: 1, render_index_form: 1
 
+  @doc """
+  Returns the default config schema.
+  """
+  def default_config_schema, do: @config_schema
+
   @doc """
   Defines `Backpex.Field` behaviour and provides default implementations.
   """
-  defmacro __using__(_) do
-    quote do
+  defmacro __using__(opts) do
+    quote bind_quoted: [opts: opts] do
+      @config_schema opts[:config_schema] || []
+
       @before_compile Backpex.Field
       @behaviour Backpex.Field
+
+      use BackpexWeb, :field
+
+      def validate_config!({name, options} = _field, live_resource) do
+        field_options = Keyword.new(options)
+
+        case NimbleOptions.validate(field_options, Backpex.Field.default_config_schema() ++ @config_schema) do
+          {:ok, validated_options} ->
+            validated_options
+
+          {:error, error} ->
+            raise """
+            Configuration error for field "#{name}" in "#{live_resource}".
+
+            #{error.message}
+            """
+        end
+      end
     end
   end
 

lib/backpex/fields/belongs_to.ex

@@ -1,15 +1,40 @@
 defmodule Backpex.Fields.BelongsTo do
+  @config_schema [
+    display_field: [
+      doc: "The field of the relation to be used for searching, ordering and displaying values.",
+      type: :atom,
+      required: true
+    ],
+    display_field_form: [
+      doc: "Field to be used to display form values.",
+      type: :atom
+    ],
+    live_resource: [
+      doc: "The live resource of the association. Used to generate links navigating to the association.",
+      type: :atom
+    ],
+    options_query: [
+      doc: """
+      Manipulates the list of available options in the select.
+
+      Defaults to `fn (query, _field) -> query end` which returns all entries.
+      """,
+      type: {:fun, 2}
+    ],
+    prompt: [
+      doc: "The text to be displayed when no option is selected or function that receives the assigns.",
+      type: :string
+    ]
+  ]
+
   @moduledoc """
   A field for handling a `belongs_to` relation.
 
-  ## Options
+  ## Field-specific options
 
-    * `:display_field` - The field of the relation to be used for searching, ordering and displaying values.
-    * `:display_field_form` - Optional field to be used to display form values.
-    * `:live_resource` - The live resource of the association. Used to generate links navigating to the association.
-    * `:options_query` - Manipulates the list of available options in the select.
-      Defaults to `fn (query, _field) -> query end` which returns all entries.
-    * `:prompt` - The text to be displayed when no option is selected or function that receives the assigns.
+  See `Backpex.Field` for general field options.
+
+  #{NimbleOptions.docs(@config_schema)}
 
   ## Example
 
@@ -26,10 +51,8 @@ defmodule Backpex.Fields.BelongsTo do
       ]
       end
   """
-  use BackpexWeb, :field
-
+  use Backpex.Field, config_schema: @config_schema
   import Ecto.Query
-
   alias Backpex.Router
 
   @impl Phoenix.LiveComponent

lib/backpex/fields/boolean.ex

@@ -1,13 +1,25 @@
 defmodule Backpex.Fields.Boolean do
+  @config_schema [
+    debounce: [
+      doc: "Timeout value (in milliseconds), \"blur\" or function that receives the assigns.",
+      type: {:or, [:pos_integer, :string, {:fun, 1}]}
+    ],
+    throttle: [
+      doc: "Timeout value (in milliseconds) or function that receives the assigns.",
+      type: {:or, [:pos_integer, {:fun, 1}]}
+    ]
+  ]
+
   @moduledoc """
   A field for handling a boolean value.
 
-  ## Options
+  ## Field-specific options
+
+  See `Backpex.Field` for general field options.
 
-  * `:debounce` - Optional integer timeout value (in milliseconds), "blur" or function that receives the assigns.
-  * `:throttle` - Optional integer timeout value (in milliseconds) or function that receives the assigns.
+  #{NimbleOptions.docs(@config_schema)}
   """
-  use BackpexWeb, :field
+  use Backpex.Field, config_schema: @config_schema
 
   @impl Backpex.Field
   def render_value(assigns) do

lib/backpex/fields/currency.ex

@@ -1,11 +1,23 @@
 defmodule Backpex.Fields.Currency do
+  @config_schema [
+    debounce: [
+      doc: "Timeout value (in milliseconds), \"blur\" or function that receives the assigns.",
+      type: {:or, [:pos_integer, :string, {:fun, 1}]}
+    ],
+    throttle: [
+      doc: "Timeout value (in milliseconds) or function that receives the assigns.",
+      type: {:or, [:pos_integer, {:fun, 1}]}
+    ]
+  ]
+
   @moduledoc """
   A field for handling a currency value.
 
-  ## Options
+  ## Field-specific options
+
+  See `Backpex.Field` for general field options.
 
-  * `:debounce` - Optional integer timeout value (in milliseconds), "blur" or function that receives the assigns.
-  * `:throttle` - Optional integer timeout value (in milliseconds) or function that receives the assigns.
+  #{NimbleOptions.docs(@config_schema)}
 
   ## Schema
 
@@ -34,10 +46,8 @@ defmodule Backpex.Fields.Currency do
         ]
       end
   """
-  use BackpexWeb, :field
-
+  use Backpex.Field, config_schema: @config_schema
   import Ecto.Query
-
   alias Backpex.Ecto.Amount.Type
 
   @impl Backpex.Field