From 358291cb222400434ff5619abd69fb8d9a6054f1 Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Wed, 2 Sep 2020 12:44:44 +0200
Subject: Admin - Document tag: add merge action

---
 ishtar_common/admin.py | 76 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 75 insertions(+), 1 deletion(-)

(limited to 'ishtar_common/admin.py')

diff --git a/ishtar_common/admin.py b/ishtar_common/admin.py
index 67b2ff41c..287f28249 100644
--- a/ishtar_common/admin.py
+++ b/ishtar_common/admin.py
@@ -64,6 +64,7 @@ from django import forms
 
 from ishtar_common import models
 from ishtar_common.apps import admin_site
+from ishtar_common.model_merging import merge_model_objects
 from ishtar_common.utils import get_cache, create_slug
 
 from ishtar_common import forms as common_forms
@@ -247,6 +248,75 @@ SERIALIZE_DESC = _("Export selected as Ishtar (zipped JSON)")
 serialize_type_action = serialize_action("types", None)
 serialize_type_action.short_description = SERIALIZE_DESC
 
+
+class MergeForm(forms.Form):
+    merge_in = forms.ChoiceField(label=_("Merge inside"), choices=[])
+
+    def __init__(self, choices, post=None, files=None):
+        if post:
+            super(MergeForm, self).__init__(post, files)
+        else:
+            super(MergeForm, self).__init__()
+        self.fields["merge_in"].choices = choices
+
+
+class MergeActionAdmin:
+    def get_actions(self, request):
+        action_dct = super(MergeActionAdmin, self).get_actions(request)
+        action_dct["merge_selected"] = (self.admin_merge, "merge_selected",
+                                        _("Merge selected items"))
+        return action_dct
+
+    def admin_merge(self, modeladmin, request, queryset):
+        return_url = reverse(
+            'admin:%s_%s_changelist' % (
+                self.model._meta.app_label,
+                self.model._meta.model_name)
+        )
+        if not request.POST:
+            return HttpResponseRedirect(return_url)
+
+        selected = request.POST.getlist('_selected_action', [])
+        if len(selected) < 2:
+            messages.add_message(
+                request, messages.WARNING,
+                str(_("At least two items have to be selected."))
+            )
+            return HttpResponseRedirect(return_url)
+
+        items = {}
+        choices = []
+        for pk in selected:
+            obj = self.model.objects.get(pk=pk)
+            choices.append((obj.pk, str(obj)))
+            items[str(obj.pk)] = obj
+
+        form = None
+        if 'apply' in request.POST:
+            form = MergeForm(choices, request.POST, request.FILES)
+            if form.is_valid():
+                merge_in = items[form.cleaned_data['merge_in']]
+                merged = []
+                for key in items.keys():
+                    if key == str(merge_in.pk):
+                        continue
+                    merge_model_objects(merge_in, items[key])
+                    merged.append(str(items[key]))
+                messages.add_message(
+                    request, messages.INFO,
+                    str(_("{} merged into {}.")).format(' ; '.join(merged),
+                                                        str(merge_in))
+                )
+                return HttpResponseRedirect(return_url)
+        if not form:
+            form = MergeForm(choices)
+        return render(
+            request, 'admin/merge.html',
+            {'merge_form': form, 'current_action': 'merge_selected',
+             'selected_items': selected}
+        )
+
+
 TokenAdmin.raw_id_fields = ('user',)
 admin_site.register(Token, TokenAdmin)
 
@@ -914,7 +984,7 @@ class GeneralTypeAdmin(ImportActionAdmin, ImportJSONActionAdmin):
 general_models = [models.OrganizationType, models.SourceType,
                   models.AuthorType, models.TitleType, models.Format,
                   models.SupportType, models.PersonType, models.LicenseType,
-                  models.DocumentTag, models.Language]
+                  models.Language]
 for model in general_models:
     admin_site.register(model, GeneralTypeAdmin)
 
@@ -1022,6 +1092,10 @@ class AreaAdmin(CreateDepartmentActionAdmin):
     )
 
 
+@admin.register(models.DocumentTag, site=admin_site)
+class DocumentTag(MergeActionAdmin, GeneralTypeAdmin):
+    pass
+
 admin_site.register(models.Area, AreaAdmin)
 
 
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