Use Resource_getWebShopImageURL to test/display image

A resource image can be defined in the Resource itself or in its variations. The easiest way to test if any image exists is to try to get its URL.

bt5/erp5_commerce/SkinTemplateItem/portal_skins/erp5_commerce_widget_library/Resource_getWebShopImageURL.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="PythonScript" module="Products.PythonScripts.PythonScript"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>Script_magic</string> </key>
+            <value> <int>3</int> </value>
+        </item>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary>
+                            <item>
+                                <key> <string>name_container</string> </key>
+                                <value> <string>container</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_context</string> </key>
+                                <value> <string>context</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_m_self</string> </key>
+                                <value> <string>script</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_subpath</string> </key>
+                                <value> <string>traverse_subpath</string> </value>
+                            </item>
+                          </dictionary>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_body</string> </key>
+            <value> <string>"""\n
+  Find default image for a given resource. If no image\n
+  is defined on the resource itself, look in each individual\n
+  variation.\n
+\n
+  TODO:\n
+  - make the variation support generic (remove hardcoded "variation"\n
+    and use another approach to select default variation based\n
+    for example on a default variation order or int_index)\n
+  - make this script cached per transaction\n
+"""\n
+request = context.REQUEST\n
+variation = request.get(\'variation\', None)\n
+if variation:\n
+  variation = context.getWebSiteValue().restrictedTraverse(variation)\n
+  image = variation.getDefaultImageValue()\n
+  if image is not None:\n
+    return image.absolute_url()\n
+\n
+default_image = context.getDefaultImageValue()\n
+if default_image is not None:\n
+  return default_image.absolute_url()\n
+\n
+if \'variation\' in context.getVariationBaseCategoryList():\n
+  default_variation = context.getVariationRangeCategoryList(base_category_list=[\'variation\'])\n
+  if len(default_variation):\n
+    default_variation = default_variation[0]\n
+    default_variation = default_variation[len(\'variation/\'):]\n
+    default_image = context.getPortalObject().restrictedTraverse(default_variation).getDefaultImageValue()\n
+    if default_image is not None:\n
+      return default_image.absolute_url()\n
+\n
+return None\n
+</string> </value>
+        </item>
+        <item>
+            <key> <string>_params</string> </key>
+            <value> <string>*args, **kw</string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>Resource_getWebShopImageURL</string> </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>Return a URL for current product image</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

bt5/erp5_commerce/SkinTemplateItem/portal_skins/erp5_commerce_widget_library/Resource_viewAsShop/default_image.xml

@@ -298,16 +298,13 @@
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
     <pickle>
-      <tuple>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-        <tuple/>
-      </tuple>
     </pickle>
     <pickle>
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: here.getDefaultImageValue() in (None, \'\') or here.getDefaultImageValue().getData() in (None, \'\')</string> </value>
+            <value> <string>python: not here.Resource_getWebShopImageURL()</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_commerce/SkinTemplateItem/portal_skins/erp5_commerce_widget_library/Resource_viewAsShop/my_default_image_absolute_url.xml

@@ -14,6 +14,7 @@
                 <string>default</string>
                 <string>description</string>
                 <string>enabled</string>
+                <string>image_display</string>
                 <string>title</string>
               </list>
             </value>
@@ -62,7 +63,9 @@
                 </item>
                 <item>
                     <key> <string>default</string> </key>
-                    <value> <string></string> </value>
+                    <value>
+                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+                    </value>
                 </item>
                 <item>
                     <key> <string>description</string> </key>
@@ -71,7 +74,7 @@
                 <item>
                     <key> <string>enabled</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -82,6 +85,10 @@
                     <key> <string>form_id</string> </key>
                     <value> <string></string> </value>
                 </item>
+                <item>
+                    <key> <string>image_display</string> </key>
+                    <value> <string></string> </value>
+                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string></string> </value>
@@ -121,6 +128,10 @@
                     <key> <string>form_id</string> </key>
                     <value> <string>File_viewFieldLibrary</string> </value>
                 </item>
+                <item>
+                    <key> <string>image_display</string> </key>
+                    <value> <string>small</string> </value>
+                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
@@ -137,16 +148,26 @@
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
     <pickle>
-      <tuple>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-        <tuple/>
-      </tuple>
     </pickle>
     <pickle>
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: here.getDefaultImageValue() not in (None, \'\') and here.getDefaultImageValue().getData() not in (None, \'\')</string> </value>
+            <value> <string>python: here.Resource_getWebShopImageURL()</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="3" aka="AAAAAAAAAAM=">
+    <pickle>
+      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_text</string> </key>
+            <value> <string>python: here.Resource_getWebShopImageURL()</string> </value>
         </item>
       </dictionary>
     </pickle>