implement a navigable book->topic->module query

client/src/graphql/gql/bookQuery.gql

@@ -0,0 +1,32 @@
+query BookQuery {
+  books {
+    edges {
+      node {
+        id
+        title
+        topics(first:3) {
+          edges {
+            node {
+              id
+              title
+              slug
+              teaser
+              description
+              modules(first:3) {
+                edges {
+                  node {
+                    id
+                    title
+                    slug
+                    teaser
+                    heroImage
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}

client/src/graphql/gql/sandbox/masterBlasterSkillBox.gql

@@ -0,0 +1,31 @@
+query BooksQuery {
+  books {
+    edges {
+      node {
+        id
+        slug
+        title
+
+      }
+    }
+  }
+
+  topics {
+    edges {
+      node {
+        id
+      }
+    }
+  }
+
+  modules {
+    edges {
+      node {
+        title
+        slug
+        heroImage
+      }
+    }
+  }
+
+}

server/book/models/book.py

@@ -27,3 +27,6 @@ class Book(Page):
     template = 'generic_page.html'
 
     subpage_types = ['book.Topic']
+
+    def get_child_ids(self):
+        return self.get_children().values_list('id', flat=True)

server/book/models/module.py

@@ -52,3 +52,7 @@ class Module(Page):
     template = 'generic_page.html'
 
     parent_page_types = ['book.Topic']
+
+    @classmethod
+    def get_topic_modules(cls, topic):
+        return cls.objects.filter(id__in=topic.get_child_ids()).live()

server/book/models/topic.py

@@ -38,3 +38,10 @@ class Topic(Page):
 
     parent_page_types = ['book.Book']
     subpage_types = ['book.Module']
+
+    def get_child_ids(self):
+        return self.get_children().values_list('id', flat=True)
+
+    @classmethod
+    def get_book_topics(cls, book):
+        return cls.objects.filter(id__in=book.get_child_ids()).live()

server/book/schema.py

@@ -31,6 +31,7 @@ class ModuleNode(DjangoObjectType):
 
 class TopicNode(DjangoObjectType):
     pk = graphene.Int()
+    modules = DjangoFilterConnectionField(ModuleNode)
 
     class Meta:
         model = Topic
@@ -46,9 +47,13 @@ class TopicNode(DjangoObjectType):
     def resolve_pk(self, *args, **kwargs):
         return self.id
 
+    def resolve_modules(self, *args, **kwargs):
+        return Module.get_topic_modules(self)
+
 
 class BookNode(DjangoObjectType):
     pk = graphene.Int()
+    topics = DjangoFilterConnectionField(TopicNode)
 
     class Meta:
         model = Book
@@ -64,6 +69,9 @@ class BookNode(DjangoObjectType):
     def resolve_pk(self, *args, **kwargs):
         return self.id
 
+    def resolve_topics(self, *args, **kwargs):
+        return Topic.get_book_topics(self)
+
 
 class ModulesQuery(object):
     books = DjangoFilterConnectionField(BookNode)