add posibility to add image preview in show/edit page

lib/kaffy/resource_form.ex

@@ -61,6 +61,12 @@ defmodule Kaffy.ResourceForm do
       !is_nil(choices) ->
         select(form, field, choices, class: "custom-select")
 
+      type == :image ->
+        build_image_preview(changeset.data, options)
+
+      type == :html ->
+        build_custom_html(changeset.data, options)
+
       true ->
         build_html_input(changeset.data, form, field, type, opts, permission == :readonly)
     end
@@ -71,6 +77,20 @@ defmodule Kaffy.ResourceForm do
     build_html_input(changeset.data, form, field, type, opts)
   end
 
+  defp build_image_preview(data, opts) do
+    url = extract_value(data, opts)
+    content_tag :img, "", src: url, style: Map.get(opts, :inline_css)
+  end
+
+  defp build_custom_html(data, opts) do
+    value = extract_value(data, opts)
+    {:safe, value}
+  end
+
+  defp extract_value(data, %{value_fn: fun}) when is_function(fun), do: fun.(data)
+  defp extract_value(_data, %{value: value}), do: value
+  defp extract_value(_data, _), do: raise (":value or :value_fn is missing")
+
   defp build_html_input(schema, form, field, type, opts, readonly \\ false) do
     data = schema
     {conn, opts} = Keyword.pop(opts, :conn)

lib/kaffy/utils.ex

@@ -352,7 +352,7 @@ defmodule Kaffy.Utils do
   end
 
   defp convert_to_atom(string) do
-    if is_binary(string), do: String.to_existing_atom(string), else: string
+    if is_binary(string), do: String.to_atom(string), else: string
   end
 
   defp setup_resources do

mix.exs

@@ -31,7 +31,7 @@ defmodule Kaffy.MixProject do
   defp deps do
     [
       {:phoenix, "~> 1.4"},
-      {:phoenix_html, "~> 2.11"},
+      {:phoenix_html, ">= 0.0.0"},
       {:mock, "~> 0.3.0", only: :test},
       {:ecto, "~> 3.0"},
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false}