Add navigation bar and fix the bug of "too many values to unbound"

templates/category.html

@@ -1,6 +1,7 @@
 {% extends "templates/base.html" %}
 
 {% block content %}
+<a href="/blog/{{ blog.id }}?page=0">Home</a> <a href="/category/{{ blog.id }}">Categories</a> <a href="/tag/{{ blog.id }}">Tags</a><br/><br/>
 {% if categories|length == 0 %}
 <b>Any category available</b><br/><br/>
 {% else %}

templates/generate.html

@@ -31,4 +31,8 @@
 {% endfor %}
 {% endif %}
 </table>
+<br/><br/>
+{% autoescape off %}
+<center>{{ navigation_bar }}</center>
+{% endautoescape %}
 {% endblock %}

templates/tag.html

@@ -1,6 +1,7 @@
 {% extends "templates/base.html" %}
 
 {% block content %}
+<a href="/blog/{{ blog.id }}?page=0">Home</a> <a href="/category/{{ blog.id }}">Categories</a> <a href="/tag/{{ blog.id }}">Tags</a><br/><br/>
 {% if tags|length == 0 %}
 <b>Any tag available</b><br/><br/>
 {% else %}

templates/view_blog.html

@@ -1,7 +1,7 @@
 {% extends "templates/base.html" %}
 
 {% block content %}
-<a href="/blog/{{ blog.id }}">Home</a> <a href="/category/{{ blog.id }}">Categories</a> <a href="/tag/{{ blog.id }}">Tags</a>
+<a href="/blog/{{ blog.id }}?page=0">Home</a> <a href="/category/{{ blog.id }}">Categories</a> <a href="/tag/{{ blog.id }}">Tags</a>
 {% if user.is_superuser %}
 <form action="/blog/edit/{{ blog.id }}" method="post">
 {% csrf_token %}
@@ -24,4 +24,8 @@
 {% endfor %}
 {% endif %}
 </table>
+<br/><br/>
+{% autoescape off %}
+<center>{{ navigation_bar }}</center>
+{% endautoescape %}
 {% endblock %}

views.py

@@ -55,6 +55,29 @@ def have_I_right(request, blog_id=None, post_id=None, must_be_superuser=False):
 
     return (b, p)
 
+def createNavigationBar(blog_id, cur_page, nb_pages):
+    navigation_bar = ''
+    if cur_page == 0:
+        navigation_bar += '<< <'
+    else:
+        navigation_bar += '<a href="/blog/%d?page=0">&lt;&lt;</a> ' % blog_id
+        navigation_bar += '<a href="/blog/%d?page=%d">&lt;</a> ' % (blog_id, cur_page-1)
+
+    for i in range(nb_pages+1):
+        if i == cur_page:
+            navigation_bar += ' %d' % (i+1)
+        else:
+            navigation_bar += ' <a href="/blog/%d?page=%d">%d</a>' % (blog_id, i, i+1)
+
+    if cur_page == nb_pages:
+        navigation_bar += ' > >>'
+    else:
+        navigation_bar += '  <a href="/blog/%d?page=%d">&gt;</a>' % (blog_id, nb_pages)
+        navigation_bar += '  <a href="/blog/%d?page=%d">&gt;&gt;</a>' % (blog_id, nb_pages)
+
+    return navigation_bar
+
+
 def index(request):
     if request.user.is_authenticated():
             return HttpResponseRedirect('/blog')
@@ -150,17 +173,17 @@ def edit_user(request, user_id):
 
 @login_required
 def category(request, blog_id):
-    b = have_I_right(request, blog_id)
+    b,_ = have_I_right(request, blog_id)
 
     categories = Category.objects.filter(blog_id=blog_id)
 
-    c = {'categories' : categories}
+    c = {'categories' : categories, 'blog' : b}
 
     return render(request, 'templates/category.html', c)
 
 @login_required
 def add_category(request, blog_id):
-    b = have_I_right(request, blog_id)[0]
+    b,_ = have_I_right(request, blog_id)
  
     if request.method == 'POST': # If the form has been submitted...
         if 'add' in request.POST:
@@ -187,7 +210,7 @@ def edit_category(request, category_id):
     if category is None:
         raise Http404
 
-    b = have_I_right(request, category.blog.id)[0]
+    b,_ = have_I_right(request, category.blog.id)
     
     if request.method == 'POST': # If the form has been submitted...
         if 'cancel' in request.POST:
@@ -215,7 +238,7 @@ def delete_category(request, category_id):
     if category is None:
         raise Http404
 
-    b = have_I_right(request, category.blog.id)[0]
+    b,_ = have_I_right(request, category.blog.id)
 
     category.remove()
     category.delete()
@@ -224,11 +247,11 @@ def delete_category(request, category_id):
 
 @login_required
 def tag(request, blog_id):
-    b = have_I_right(request, blog_id)
+    b,_ = have_I_right(request, blog_id)
 
     tags = Tag.objects.filter(blog_id=blog_id)
 
-    c = {'tags' : tags}
+    c = {'tags' : tags, 'blog' : b}
 
     return render(request, 'templates/tag.html', c)
 
@@ -239,7 +262,7 @@ def edit_tag(request, tag_id):
     if tag is None:
         raise Http404
 
-    b = have_I_right(request, tag.blog.id)[0]
+    b,_ = have_I_right(request, tag.blog.id)
     
     if request.method == 'POST': # If the form has been submitted...
         if 'cancel' in request.POST:
@@ -266,7 +289,7 @@ def delete_tag(request, tag_id):
     if tag is None:
         raise Http404
 
-    b = have_I_right(request, tag.blog.id)[0]
+    b,_ = have_I_right(request, tag.blog.id)
 
     tag.remove(b)
     tag.delete()
@@ -307,16 +330,27 @@ def add_blog(request):
 
 @login_required
 def view_blog(request, blog_id):
-    if not request.user.is_superuser:
+    b,_ = have_I_right(request, blog_id)
-        b = Blog.objects.filter(id=blog_id).filter(writers=request.user.id)
+
+    count = Post.objects.filter(blog=b).count()
+    nb_pages = int(count/50)
+    if 'page' in request.GET:
+        cur_page = int(request.GET['page'])
     else:
-        b = Blog.objects.get(pk=blog_id)
+        if 'cur_page' in request.session:
+            cur_page = request.session['cur_page']
+        else:
+            cur_page = 0
 
-    if b is None:
+    if cur_page < 0 : cur_page = 0
-        raise Http404
+    if cur_page > nb_pages : cur_page = nb_pages-1
 
-    posts = Post.objects.filter(blog=b).order_by('-creation_date')
+    request.session['cur_page'] = cur_page
-    b = Blog.objects.get(pk=blog_id)
+
+    start = cur_page * 50
+    end = start + 50
+
+    posts = Post.objects.filter(blog=b).order_by('-creation_date')[start:end]
     form = BlogForm(instance=b)
     
     comments = Comment.objects.all()
@@ -328,7 +362,9 @@ def view_blog(request, blog_id):
         else:
             dict_comments[key] = dict_comments[key] + 1
 
-    c = {'blog' : b, 'posts' : posts, 'form' : form, 'comments' : dict_comments}
+    navigation_bar = createNavigationBar(b.id, cur_page, nb_pages)
+
+    c = {'blog' : b, 'posts' : posts, 'form' : form, 'comments' : dict_comments, 'navigation_bar' : navigation_bar}
 
     return render(request, 'templates/view_blog.html', c)
 
@@ -389,7 +425,6 @@ def add_post(request, blog_id):
 @login_required
 def edit_post(request, post_id):
     (b, post) = have_I_right(request, None, post_id)
-    post = Post.objects.get(pk=post_id)
 
     title = post.title
     blog_id = b.id
@@ -434,20 +469,20 @@ def edit_post(request, post_id):
 def delete_post(request, post_id):
     (b, post) = have_I_right(request, None, post_id)
 
-    blog_id = b.id
-
     post.delete()
 
-    return HttpResponseRedirect('/blog/' + str(blog_id))
+    return HttpResponseRedirect('/blog/' + str(b.id))
 
 @login_required
 def generate(request, blog_id):
-    (b, post) = have_I_right(request, blog_id)
+    b,_ = have_I_right(request, blog_id)
 
     b.create_paths()
     report = b.generate()
 
-    posts = Post.objects.filter(blog=b).order_by('-creation_date')
+    count = Post.objects.filter(blog=b).count()
+    nb_pages = int(count/50)
+    posts = Post.objects.filter(blog=b).order_by('-creation_date')[0:50]
     b = Blog.objects.get(pk=blog_id)
     form = BlogForm(instance=b)
     
@@ -460,7 +495,9 @@ def generate(request, blog_id):
         else:
             dict_comments[key] = dict_comments[key] + 1
 
-    c = {'blog' : b, 'posts' : posts, 'form' : form, 'report': report, 'comments' : dict_comments}
+    navigation_bar = createNavigationBar(b.id, 0, nb_pages)
+
+    c = {'blog' : b, 'posts' : posts, 'form' : form, 'report': report, 'comments' : dict_comments, 'navigation_bar' : navigation_bar}
     
     return render(request, 'templates/generate.html', c)