bpartridge · March 5, 2020 17:27 · May 8, 2014 · May 8, 2014
diff --git a/app-slash-admin-slash-active_admin_extensions.rb b/app-slash-admin-slash-active_admin_extensions.rb
@@ -23,7 +23,7 @@ def default_table
       id_column
       resource_class.content_columns.each do |col|
         if col.name.ends_with? "img"
-          img_column col.name.to_sym, col.name.sub("img","image")
+          img_column col.name.to_sym
         else
           column col.name.to_sym
         end

diff --git a/app-slash-admin-slash-active_admin_extensions.rb b/app-slash-admin-slash-active_admin_extensions.rb
@@ -0,0 +1,74 @@
+# This file extends and overrides parts of the ActiveAdmin DSL and internals
+# in order to provide support for automatically displaying and editing images,
+# which in our infrastructure are stored as URLs whose column names end in "img".
+# Since this file will be reloaded frequently in the development environment,
+# all operations done at load time (class_eval's, etc.) MUST be idempotent.
+
+ActiveAdmin::Views::TableFor.class_eval do
+
+  def img_column(col_sym=:img, title="Image")
+    column title, sortable: false do |obj|
+      url = obj.send(col_sym)
+      link_to(filepicker_image_tag(url, width: 100, height: 100), url)
+    end
+  end
+
+end
+
+# You can also subclass this and do `index as: MyIndexAsTableSubclass` to get the same functionality
+ActiveAdmin::Views::IndexAsTable.class_eval do
+  def default_table
+    proc do
+      selectable_column
+      id_column
+      resource_class.content_columns.each do |col|
+        if col.name.ends_with? "img"
+          img_column col.name.to_sym, col.name.sub("img","image")
+        else
+          column col.name.to_sym
+        end
+      end
+      default_actions
+    end
+  end
+end
+
+ActiveAdmin::Views::AttributesTable.class_eval do
+  def content_for(record, attr)
+    previous = current_arbre_element.to_s
+
+    if attr.to_s.ends_with? "img"
+      value = find_attr_value(record, attr)
+      value = link_to(filepicker_image_tag(value, width: 200, height: 200), value)
+    else
+      value = pretty_format find_attr_value(record, attr)
+    end
+
+    value.blank? && previous == current_arbre_element.to_s ? empty_value : value
+  end
+end
+
+class FilepickerForActiveAdminInput
+  include Formtastic::Inputs::Base
+  def to_html
+    input_wrapping do
+      label_html << 
+      builder.filepicker_field(method, input_html_options)
+    end
+  end
+end
+
+ActiveAdmin::FormBuilder.class_eval do
+
+  protected
+
+  def default_input_type(method, options = {})
+    if column = column_for(method) and column.type == :string
+      if method.to_s.ends_with? "img"
+        return :filepicker_for_active_admin
+      end
+    end
+    super
+  end
+
+end
diff --git a/config-slash-initializers-slash-inflections.rb b/config-slash-initializers-slash-inflections.rb
@@ -0,0 +1,6 @@
+# This will provide human-readable column names across the board, including all the
+# ActiveAdmin pages (which all use pretty_format which uses the Inflector).
+
+ActiveSupport::Inflector.inflections do |inflect|
+  inflect.human /img$/, '\1image'
+end
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