Write a tumblelog application with flask and mongoengine imagefield

Write a tumblelog application with flask and mongoengine imagefield

I'd like to use this to make a form where users can add or remove items. In our Tumblelog application we need to store several different types of information. Positional arguments are assigned to fields in the order they were defined in the User class. How do I determine which button was clicked and redirect based on that? This way, models of different types can be collocated in the same collection while preserving type information. Also, the User documents will be stored in a MongoDB collection rather than a table. Similarly, if we have multiple documents we need to reference, we can just have a list of these embedded documents. Any help it 1 populate WTForms select field using value selected from previous field New to this, trying to build an app following a well known Flask tutorial, using Flask-bootstrap, Flask-wtforms, Jinja etc I have a form with 2 select fields and a button. Any ideas? If the deleted object was just one among potentially many other references stored in a list, remove the reference from this list. When we call a QuerySet method from a Manager, as in Post.

This lazily queries the database only when you need the data. Because it does not inherit directly from MongoModel, it does not have its own collection.

Mongoengine vs pymongo

This would be handy if we only ever cared about Posts that have been published. Create a view that a it 0 Determine which WTForms button was pressed in a Flask view I have a page with multiple links to redirect the user to different pages. If we were using a relational database, we would most likely have a table of posts, a table of comments and a table of tags. One way is simply to use the objects attribute of a subclass of Post: for post in TextPost. Post gets a little more interesting. WTF extension. When we access the data stored in a ReferenceField , it is dereferenced automatically. Cascade the deletes: when a referenced object is deleted, recursively delete all objects that were referencing it. This will tell us whether the Post has been published or not. Finally, it would be nice if comments could be added to posts.

This will require some sort of Ajax framework to dynamically add widgets, but the WTForms documentation makes no mention o it 0 Send Data from a textbox into Flask? Actually, there is a more general rule here: the objects attribute of any subclass of Document only looks for documents that were created using that subclass or one of its subclasses.

Mongoengine connect

The downside to doing this is that it is difficult to query for individual Comment objects. However, defining schemas for our documents can help to iron out bugs involving incorrect types or missing fields, and also allow us to define utility methods on our documents in the same way that traditional ORMs do. This will tell us whether the Post has been published or not. Using MongoDB we can store the comments as a list of embedded documents directly on a post document. Cascade the deletes: when a referenced object is deleted, recursively delete all objects that were referencing it. There are several ways we can achieve this, but each of them have their problems — none of them stand out as particularly intuitive solutions. In a relational database, to display a post with its comments, we would have to retrieve the post from the database and then query the database again for the comments associated with the post. This makes a separate query to the database. Any help it 1 populate WTForms select field using value selected from previous field New to this, trying to build an app following a well known Flask tutorial, using Flask-bootstrap, Flask-wtforms, Jinja etc I have a form with 2 select fields and a button. All used libraries in virtuaelnv. These are similar to foreign key fields in traditional ORMs, and are automatically translated into references when they are saved, and dereferenced when they are loaded.

To associate the comments with individual posts, we would put a column in the comments table that contained a foreign key to the posts table. Create a view that a it 0 Determine which WTForms button was pressed in a Flask view I have a page with multiple links to redirect the user to different pages.

mongoengine django

ImageField The above model subclasses the Post model we wrote earlier. The User that represents the author in each case is stored among all the other Users in the myDatabase.

This makes life a lot easier in many regards, especially when there is a change to the data model. This fits with the Object-Oriented principle of inheritance nicely.

WTForms includes a FieldList field for lists of fields. When we access the data stored in a ReferenceFieldit is dereferenced automatically. Positional arguments are assigned to fields in the order they were defined in the User class.

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使用Flash和MongoEngine 写一个轻博客应用