WIP: Add resource table component

Add first try of a resource table. It is pretty raw and does not create the right output, but it is only a proposal.

app/components/alchemy/admin/resource_table.rb

@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+module Alchemy
+  module Admin
+    class ResourceTable < ViewComponent::Base
+      include BaseHelper
+
+      attr_reader :columns, :collection, :nothing_found_label
+
+      erb_template <<~ERB
+        <% if collection.any? %>
+          <table class="list">
+            <thead>
+              <tr>
+                <% columns.each do |column| %>
+                  <th><%= column.label || column.name %></th>
+                <% end %>
+              </tr>
+            </thead>
+            <tbody>
+              <% collection.each do |row| %>
+                <tr class="<%= cycle('even', 'odd') %>">
+                  <% columns.each do |column| %>
+                    <td class="<%= column.name %>">
+                      <%= view_context.capture(row, &column.block) %>
+                    </td>
+                  <% end %>
+                </tr>
+              <% end %>
+            </tbody>
+          </table>
+        <% else %>
+          <div class="info">
+            <%= render_icon('info') %>
+            <%= nothing_found_label %>
+          </div>
+        <% end %>
+      ERB
+
+      def initialize(collection, nothing_found_label: Alchemy.t("Nothing found"))
+        @collection = collection
+        @nothing_found_label = nothing_found_label
+        @columns = []
+      end
+
+      def add_column(name, label: nil, sortable: true, &block)
+        @columns << Column.new(name, label: label, sortable: sortable, &block)
+      end
+
+      private
+
+      ##
+      # the before_render - method is necessary to force ViewComponent to evaluate the add_column - calls
+      def before_render
+        content
+      end
+
+      class Column
+        attr_reader :block, :label, :name, :sortable
+
+        def initialize(name, sortable:, label: nil, &block)
+          @name = name
+          @label = label
+          @sortable = sortable
+          @block = block || lambda { |item| item[name] }
+        end
+      end
+    end
+  end
+end

spec/components/alchemy/admin/resource_table_spec.rb

@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe Alchemy::Admin::ResourceTable, type: :component do
+  let(:collection) { [] }
+  before do
+    render
+  end
+
+  subject(:render) do
+    render_inline(described_class.new(collection))
+  end
+
+  context "with data" do
+    let(:collection) {
+      [
+        {name: "Foo", description: "Awesome description"},
+        {name: "Bar", description: "Another description"}
+      ]
+    }
+
+    it "doesn't renders an info message" do
+      expect(page).to_not have_content("Nothing found")
+    end
+
+    context "columns without block" do
+      subject(:render) do
+        render_inline(described_class.new(collection)) do |component|
+          component.add_column(:name)
+          component.add_column(:description)
+        end
+      end
+
+      it "renders a table header" do
+        expect(page).to have_selector("table th", text: "name")
+        expect(page).to have_selector("table th", text: "description")
+      end
+
+      it "renders a table cell" do
+        expect(page).to have_selector("table td.name", text: "Foo")
+        expect(page).to have_selector("table td.description", text: "Awesome description")
+      end
+    end
+
+    context "columns with custom label" do
+      subject(:render) do
+        render_inline(described_class.new(collection)) do |component|
+          component.add_column(:name, label: "Awesome Name")
+        end
+      end
+
+      it "renders a table header with custom label" do
+        expect(page).to have_selector("table th", text: "Awesome Name")
+      end
+    end
+
+    context "columns with a custom block" do
+      subject(:render) do
+        render_inline(described_class.new(collection)) do |component|
+          component.add_column(:description) { |item| item[:description].truncate(10) }
+        end
+      end
+
+      it "renders a table cell with a custom block" do
+        expect(page).to have_selector("table td", text: "Awesome...")
+      end
+    end
+  end
+
+  context "without any data" do
+    it "renders an info message" do
+      expect(page).to have_content("Nothing found")
+    end
+
+    context "with another nothing found - label" do
+      subject(:render) do
+        render_inline(described_class.new(collection, nothing_found_label: "No user found"))
+      end
+
+      it "renders an info message" do
+        expect(page).to have_content("No user found")
+      end
+    end
+  end
+end