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id) list(): Only comments associated with the current page should be listed, so once again the query is modified to include the page ID In this case, though, we also have to pass the pageid argument, which will in turn get passed to any hurl_for() calls in the paginator def list(self): comments_q = metaSessionquery(modelComment)filter_by(pageid=cpageid) comments_q = comments_qorder_by(modelcomment_tableccreatedasc()) cpaginator = paginatePage( comments_q, page=int(requestparamsget('page', 1)), items_per_page=10, pageid=cpageid, controller='comment', action='list' ) return render('/derived/comment/listhtml') Notice the use of order_by() to ensure that the earliest comments are displayed first I ve used the comment_table column metadata in the order_by() method just to remind you that you can use table metadata as well as class attributes when specifying query arguments, and I ve used the asc() method to specify that the results should be specified in ascending order.

Qt s classes for handling and interfacing databases can be split into three groups. The first layer is based around a set of database drivers, which make it possible to access different types of database servers using Qt. The second layer handles connections to databases, queries, and their results, as well as error messages from the database servers. This layer is based on the driver layer because a driver is required to connect to a database. The third layer, which is called the user interface layer, offers a set of models for use with Qt s model view framework.

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A typical HTTP request that a browser will make to a web server for the server s home page is the following: GET / HTTP/1.0 When the web server receives this request for the filename /, the root document on the web server, it attempts to load a file usually called index.html. If the server can locate the file requested, it sends back the following HTTP response, followed by the contents of the document: HTTP/1.0 200 OK <document content> Once the browser receives the document contents, very often in HTML, it will render that document on the user s screen.

delete(): Again, this requires only a check that the page ID in the URL is the same as the one in the comment Since the form doesn t allow you to change the page ID, this can once again be ensured by adding cpageid to the query: comment = comment_qfilter_by(pageid=cpageid, id=id)first() Now that all the changes have been made, let s test the new controller Start by adding a new comment to the home page by visiting http://localhost:5000/page/1/comment/new and filling in the form When you click Create Comment, you will see Figure 14-2..

Caution It is recommended that you work with a test database when you are developing new software

Figure 14-2. The first comment Finally, let s update the comment view template derived/comment/view.html so that edit and delete links are added to the footer. Add the following at the end of the template: <%def name="footer()"> ## Add our comment links <p> <a href="${h.url_for(pageid=c.page.id, controller='comment', action='edit', id=c.comment.id)}">Edit Comment</a> | <a href="${h.url_for(pageid=c.page.id, controller='comment', action='delete', id=c.comment.id)}">Delete Comment</a> </p> ## Include the parent footer too ${parent.footer()} </%def> Make sure you followed the instructions earlier in the chapter to update the values variable in the edit() action; you will then find you can easily edit or delete comments. There are still no links to display or add comments from the bottom of individual pages. You ll fix that in the next section.

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