add split works funtionality

core/bookloader.py

@@ -488,6 +488,20 @@ def merge_works(w1, w2, user=None):
         
     w2.delete()
     
+def detach_edition(e):
+    """will detach edition from its work, creating a new stub work. if remerge=true, will see if there's another work to attach to
+    """
+    logger.info("splitting edition %s from %s", e, e.work)
+    w = models.Work(title=e.title, language = e.work.language)
+    w.save()
+    
+    for identifier in e.identifiers.all():
+        identifier.work = w
+        identifier.save()
+    
+    e.work = w
+    e.save()
+
 def despam_description(description):
     """ a lot of descriptions from openlibrary have free-book promotion text; this removes some of it."""
     if description.find("GeneralBooksClub.com")>-1 or description.find("AkashaPublishing.Com")>-1:

frontend/templates/split.html

@@ -0,0 +1,33 @@
+{% extends "basedocumentation.html" %}
+
+{% block doccontent %}
+    <h2 class="book-name"><a href="{% url work work.id %}">{{ work.title }}</a></h2>
+            
+
+    <h2>Split Editions</h2>
+    <form method="POST" action="#">
+        {% csrf_token %}
+        {{ formset.management_form }}
+        <dl>
+        {% for form in formset %}
+            <dt class="editionbox">
+                {{ form.instance.title }},  published by {{form.instance.publisher}} in {{ form.instance.publication_date }} 
+                </dt>
+            <dd>with authors 
+            {% for author in form.instance.authors.all %}
+                {{author}}, 
+            {% endfor %}
+            <br />
+            ISBN: {{ form.instance.isbn_13 }}
+            <br />
+            {{ form.id }}Split this Edition: {{form.DELETE.0}}
+            </dd>
+        {% endfor %}
+        </dl>
+        <input type="submit" value="Split Editions" name="submit" />
+    </form>
+    <h2>More Edition Management</h2>
+    <div><a href="{% url merge work.id  %}">Merge other works into this one</a></div>
+    <div><a href="{% url new_edition work.id '' %}">Create a new edition for this work</a><br /><br /></div>
+
+{% endblock %}

frontend/urls.py

@@ -57,6 +57,7 @@ urlpatterns = patterns(
     url(r"^lockss/(?P<year>\d+)/$", "lockss_manifest", name="lockss_manifest"),
     url(r"^work/(?P<work_id>\d+)/download/$", "download", name="download"),
     url(r"^work/(?P<work_id>\d+)/merge/$", login_required(MergeView.as_view()), name="merge"),
+    url(r"^work/(?P<work_id>\d+)/split/$", "split_work", name="split"),
     url(r"^work/\d+/acks/images/(?P<file_name>[\w\.]*)$", "static_redirect_view",{'dir': 'images'}), 
     url(r"^work/(?P<work_id>\d+)/librarything/$", "work_librarything", name="work_librarything"),
     url(r"^work/(?P<work_id>\d+)/goodreads/$", "work_goodreads", name="work_goodreads"),

frontend/views.py

@@ -35,6 +35,7 @@ from django.core.urlresolvers import reverse
 from django.db.models import Q, Count, Sum
 from django.forms import Select
 from django.forms.models import modelformset_factory
+from django.forms.models import inlineformset_factory
 from django.http import HttpResponseRedirect, Http404
 from django.http import HttpResponse, HttpResponseNotFound
 from django.shortcuts import render, render_to_response, get_object_or_404
@@ -54,7 +55,7 @@ from regluit.core import tasks
 from regluit.core import models, bookloader, librarything
 from regluit.core import userlists
 from regluit.core import goodreads
-from regluit.core.bookloader import merge_works
+from regluit.core.bookloader import merge_works, detach_edition
 from regluit.core.goodreads import GoodreadsClient
 from regluit.core.search import gluejar_search
 from regluit.core.signals import supporter_message
@@ -725,6 +726,22 @@ class CampaignListView(FilterableListView):
             context['facet'] =self.kwargs['facet']
             return context
 
+@login_required
+def split_work(request,work_id):
+    if not request.user.is_staff:
+        return render(request, "admins_only.html")
+    work = get_object_or_404(models.Work, id=work_id)
+    EditionFormSet = inlineformset_factory(models.Work, models.Edition, fields=(), extra=0 )    
+    
+    if request.method == "POST":
+        formset = EditionFormSet(data=request.POST, instance=work)
+        if formset.is_valid():
+            for form in formset.deleted_forms:
+                detach_edition(form.instance)
+                
+    formset = EditionFormSet(instance=work)
+    return render(request, "split.html", { "work":work, "formset": formset,})
+
 class MergeView(FormView):
     template_name="merge.html"
     work=None