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You ll need to correct the new comment controller s list() action because some of the variables will have been accidentally renamed. Change it to look like this: def list(self): comments_q = meta.Session.query(model.Comment) c.paginator = paginate.Page( comments_q, page=int(request.params.get('page', 1)), items_per_page = 10, controller='comment', action='list' ) return render('/derived/comment/list.html') You ll actually use this basic controller template again later in the tutorial when you create a controller to handle tags and sections, so take a copy of the comment controller and call it template.py.txt so that you can use it later (you are using a .py.txt extension so that the template isn t accidentally treated as a controller): cd ../../../ $ cp comment.py template.py.txt

Now that the basic structure of the comment controller is in place, it needs to be updated to correctly handle the fields and relationships of the comment table. Comment objects have a .content property for the comment text itself, a .name property to hold the name of the person who left the comment, and an .email property for their e-mail address. You ll need fields for each of these so that a user can leave a comment. Let s start by creating a FormEncode schema. Update the NewCommentForm schema to look like this: class NewCommentForm(formencode.Schema): allow_extra_fields = True filter_extra_fields = True name = formencode.validators.String(not_empty=True) email = formencode.validators.Email(not_empty=True) content = formencode.validators.String( not_empty=True, messages={ 'empty':'Please enter a comment.' } )

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Now you can SELECT from names and ask the database to JOIN the tables names and salaries ON the id columns. This is expressed in SQL as follows: SELECT names.firstname, names.lastname, salaries.annual FROM names JOIN salaries ON names.id = salaries.id The result from this statement is shown as follows (the rows not represented in both tables are left out):

If those written-down passwords are stored in a user s wallet with all of his other credentials, that would involve some risk; but if they re on a Post-it note stuck to the side of a monitor in a public office space, that would involve significantly more risk! A good security technology can increase both convenience and security although that may not always be possible For example, if you allow users to choose their own passwords, but make them choose sufficiently complicated ones (eg, require that users enter one digit or special character into a password that s between eight and ten characters), this might significantly increase security at the cost of only a little bit of inconvenience A good security technology will provide a relative security benefit at only a slight inconvenience to users.

The example uses the allow_extra_fields = True option so that the form s submit button isn t validated and uses the filter_extra_fields = True option so that it isn t included in the results returned when the schema converts the form input to a Python dictionary A custom error message is used if the user forgets to enter a comment, and the e-mail address uses an Email validator to make sure the user enters a string that looks like an e-mail address You ll also need to update the /templates/derived/comment/fieldshtml file so it represents the correct fields you d like users to enter: ${hfield( "Name", htext(name='name'), required=True, )} ${hfield( "Email", htext(name='email'), required=True, field_desc = 'Use to help prevent spam but will not be published', )} ${hfield( "Comment", h.

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textarea(name='content', rows=7, cols=40), required=True, )} Notice that although the field name is called content, it is labeled Comment This is to make it more obvious to the users of the application After all, they don t need to know that the comment text they enter is actually stored in the content column of the table Next update the edit() action so that the correct values are prepared for the call to htmlfill render(): values = { 'name': commentname, 'email': commentemail, 'content': commentcontent, } Let s also update the viewhtml template to display the comment information to look more like a comment Update it to look like this: <%inherit file="/base/indexhtml"/> <%def name="title()">Comment</%def> <%def name="heading()"><h1>Comment</h1></%def> ${ccommentcontent} <p><em>Posted by ${ccommentname} on ${ccommentcreatedstrftime('%c')}</em></p> <p><a href="${hurl_for(controller='page', action='view', id=ccommentpageid)}">Visit the page this comment was posted on.

A good technology will increase both convenience and security, because even if it introduces a slight inconvenience, it can reduce or eliminate more significant inconveniences (and damages) that may occur as the result of a successful attack..

To get all the rows from the names table, replace JOIN with LEFT JOIN. All the rows are returned from the first table (the one on the left in the statement). The resulting statement is this: SELECT names.firstname, names.lastname, salaries.annual FROM names LEFT JOIN salaries ON names.id = salaries.id The rows not represented in the salaries table get the value NULL. The result from the query can be seen in the following table:

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