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When a tag is deleted, it can no longer be used on a page, so all references to that tag need to be removed from the pagetag table. Likewise, when a page is deleted, there is little point in keeping track of which tags used to be associated with it, so all references to that page should be removed from the pagetag table too. Add the following line just before meta.Session.delete(page) in the delete() action in the page controller: meta.Session.execute(delete(model.pagetag_table, model.pagetag_table.c.pageid==page.id)) Now add this just before meta.Session.delete(tag) in the delete() action of the tag controller: meta.Session.execute(delete(model.pagetag_table, model.pagetag_table.c.tagid==tag.id)) Both controllers will require the following import: from sqlalchemy import delete If you visit the home page at http://localhost:5000/page/view/1 and create some tags, you ll now be able to tag pages. The application should look like it did in Figure 14-5.

The user interface is implemented in the ImageDialog class. The public part of the class declaration, shown in Listing 13-6, consists of a constructor and a set of slots, where each slot represents a user action. What can the user do Looking at the class declaration and Figure 13-1 you can see a number of possible user actions. The following lists them and their corresponding slots: Move between the images: nextClicked and previousClicked Change the selection in the list of tags: tagsChanged Add a new image: addImageClicked Add a new tag: addTagClicked Add to this list the inherited tasks, such as being able to close the dialog to exit the application. Listing 13-6. Half of the ImageDialog class declaration class ImageDialog : public QDialog { Q_OBJECT public: ImageDialog(); private slots: void nextClicked(); void previousClicked(); void tagsChanged(); void addImageClicked(); void addTagClicked(); ... };

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Now that the basic functionality of the web site is in place, I ll cover how to add a navigation structure to turn the application into a full (albeit simple) content management system In this second part of the chapter, you ll learn about table inheritance and how to structure hierarchical data in SQLAlchemy Let s start by thinking about how pages are typically structured on web sites Pages can usually be thought of as being divided into sections, with each section containing pages and other sections You will need top-level tabs for the top-level sections and then a navigation menu so that the pages within each section can be displayed You ll also need a breadcrumb trail so that the user can always navigate to a section higher up in the hierarchy The URL for each page will be determined by the URL path info part.

The other half of the class declaration tells you something about how the application works (the source code is shown in Listing 13-7). It starts with four private support methods: selectedTags, updateImages, updateTags, and updateCurrentImage. You will look at each one of them soon. After the methods, the Designer-generated user interface class is included as ui before the member variables used for keeping track of the images. The imageIds list contains the id values for the images that are shown according to the selected tags. The currentImage is an index into the imageIds list that indicates which image is active. Finally, the images variable is an instance of the ImageCollection class that handles the database. Listing 13-7. The private half of the ImageDialog class declaration class ImageDialog : public QDialog { ... private: QStringList selectedTags(); void updateImages(); void updateTags(); void updateCurrentImage(); Ui::ImageDialog ui; QList<int> imageIds; int currentImage; ImageCollection images; };

If a URL resolves to a section rather than to a page, you need to render the index page for that section The index page will simply be the page in the section named index You ll also set up the URLs such that those with a trailing slash (/) at the end always resolve to sections and those without resolve to a page Thus, /dev will display a page, and /dev/ will display the index page in the dev section Some people find it a little strange to have pages without file extensions, but if you would prefer your pages to have URLs that end in html, feel free to update the code as you work through the examples The following is the URL structure to create.

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