web2py response stream

A generic view which streams a list as a CSV for the user to open in a spreadsheet. For example _href is the href attribute, _class is the class attribute, etc. The difference between editors and authors is that the editors can create pages, edit and delete any page, while the authors can create pages (with some optional restrictions) and can only edit/delete the pages they have created. If the application was packaged with source code or edited locally, there is no harm in removing the bytecode-compiled files, and the application will continue to work. This is done by appending an entry to the EMBED_MAPS list: If you create a wiki page with slug "contactus" you can refer to this page as. Here is yet another better way to create the same form: The form object can be easily serialized in HTML by embedding it in the "default/first.html" view. Re: [web2py] Re: Caching downloads Web2py takes care of chunked streaming via the stream() function, we just have to write a file object that we pass to stream(), this will take care of loading the jpeg frames and providing the data back to stream(), which in turn will stream this down the line to the client. We have not added validation yet, but it is now clear that validation should be performed by the first action. written by Massimo Di Pierro in English, """ this controller returns a dictionary rendered by the view, """browser, edit all documents attached to a certain page""", "ajax('callback', ['keyword'], 'target');", """an ajax callback that returns a

    of links to wiki pages""", """generates rss feed from the wiki pages""", 'http://127.0.0.1:8000/mywiki/default/index', """finds pages that contain keyword for XML-RPC""", """exposes all registered services, including XML-RPC""", 'http://127.0.0.1:8000/mywiki/default/call/xmlrpc', # Make sure this is called after the auth instance is created, # and before any change to the wiki tables, # Place this after auth object initialization, web2py Portuguese (Translation in progress). We assume the code below will replace any existing code in "db.py". You can use the env parameter of auth.wiki to expose functions to your wiki. If the extension is not provided, it is appended by web2py. It uses multiprocessing.connection to communicate between the backend and frontend, with a JSON-RPC-like stream protocol. We used double dash for nested menu items. The web2py DAL translates Python code into SQL statements that are specific to the selected database back-end (SQLite in this example). The "download" action does not return a dictionary, so it does not need a view. When a table is defined, web2py takes one of several possible actions: This behavior is called "migration". The following figure shows what happens when you submit a form that does not pass validation: The same forms that are automatically generated by appadmin can also be generated programmatically via the SQLFORM helper and embedded in user applications. Alternatively, you can choose to accept raw HTML instead of markmin syntax. pages. from applications.ChartGenerator.modules import generator from gluon import HTTP, contenttype #URL def generate(): if request.env.request_method == 'POST': Write the corresponding actions in the default controller: Then create a view "default/first.html" for the first action, and enter: Finally, create a view "default/second.html" for the second action: In both views we have extended the basic "layout.html" view that comes with web2py. ), but they are not listed on the edit page because they are not created or modified by the administrator; they are created and modified by the application itself. It allows packing the application without source code for distribution as closed source. IS_NOT_IN_DB(a, b) is a special validator that checks that the value of a field b for a new record is not already in a. Here, as an example, we create a simple web app that displays the message "Hello from MyApp" to the user. Start by creating a new scaffolding app, naming it "mywiki". It lists all installed applications on the left, while on the right side there are some special action forms. A better pattern for form submission is to submit forms to the same action that generated them, in our example the "first". Go back to the edit page. define_table is a method of the db object. If you click on the number of a reference field, you get an edit page for the referenced record. Both comment and document reference page because they belong to page. You can make your own view for this action: and add extra HTML or code as needed. The model must contain three tables: page, comment, and document. The keys of the items in the dictionary are interpreted as variables passed to the view associated to the action. From the admin application's site page, you can perform the following operations: When you create a new application using admin, it starts as a clone of the "welcome" scaffolding app with a "models/db.py" that creates a SQLite database, connects to it, instantiates Auth, Crud, and Service, and configures them. Internally, at the web2py level, they are stored as datetime.date, datetime.datetime and datetime.time object respectively and they can be manipulated as such: When dates are converted to strings in forms they are converted using the ISO representation. For each row the columns can be accessed as dictionaries: images[0]['title'] or equivalently as images[0].title. Web2py uses the .w2p extension instead of the .tgz extension to prevent the browser from unzipping on download. response.stream(file, chunk_size): quando un controller ritorna questo valore web2py invia il contenuto al client in blocchi delle dimensioni di chunk_size. [qdb]. You can also specify a view with response.view = 'default/something.html'. Be careful using the web based shell - because different shell requests will be executed in different threads. You can type in (or cut-and-paste) any URL into a wiki page and it is rendered as a link to the URL. They are important for building custom forms and will be discussed later. If you were to edit the model and access appadmin again, web2py would generate SQL to alter the existing tables. Each section in the edit page corresponds to a subfolder in the application folder. Lines 4-5 inside the comment are interpreted by python as test code (doctest). There is also a source code version that runs on Windows, Mac, Linux, and other Unix systems. There are two default controllers: "appadmin.py" and "default.py". If you go back to "EDIT" and click on index, you will now see the following HTML page: to the code in a view and it will show you some useful information, including the request, response and session objects, and list all db queries with their timing. The visitor will also be able to post comments (exactly as in the previous applications), and also post documents (as attachments to the pages) and link them from the pages. For example, you might want to customize a wiki table record representation or add a new field validator. First, you need to create/edit a model file which, for lack of imagination, we call "db.py". It is possible for an app created by a student to access the data and the source of an app created by another student. It will allow you to deploy to GAE from the admin interface. web2py includes a powerful pluralization engine which is described in the next chapter. response.download() calls response.stream() to do the streaming stuff. The default layout will also show options to the corresponding pages in the top right corner. The administrator can switch between the two views. It could have been defined in the view as well. The "first" action should receive the variables, process them, store them server-side, and redirect the visitor to the "second" page, which retrieves the variables. I have been reading as much as I can find but nothing seems to match exactly what … For security reasons, the developer is asked to choose a new password every time web2py starts unless the option is specified. • response.body: a stringio object into which web2py writes the output page body. But when I have this called as a target function from web2py_component in index.html (to fill a div with the response)like this: Search. If you have the SDK you may want to change these config parameters to the correct value. You can also set web2py admin in demo mode: And only the apps listed in FILTER_APPS will be accessible and they will be only accessible in read-only mode. The interface of the wizard will change over time to include support for more features and easier visual development. Here is the output: If you click on the number of an id field, you get an edit page for the record with the corresponding id. Lines 13, 20 define and process create forms for a new page and a new comment and. Clean up temporary files (sessions, errors, and cache.disk files). Lines 5-7 loop over the image rows and for each row image display: This is a
  • ...
  • tag that contains an ... tag which contains the image.title. The MARKMIN syntax allows you to markup bold text using **bold**, italic text with ''italic'', and code text should be delimited by double inverted quotes. If you do not provide an administrator password, the administration interface is disabled. Recipe by Massimo Di Pierro (mdipierro) on 2009-11-12 in Application. If you are into Ajax, JSON is fully supported in web2py. The other arguments are the fields belonging to that table. If you are a teacher and want to expose the administrative interface to students so that students can share one administrative interface for their projects (think of a virtual lab), can do it by setting: In this way students will be required to login and will only be able to access their own apps via admin. To get started, unzip the downloaded zip file for your specific operating system and execute the corresponding web2py file. response.stream(file, chunk_size, request=request, attachment=False, filename=None): when a controller returns it, web2py streams the file content back to the client in blocks of size chunk_size. In line 14, db.image.title represents the field "title" of table "image". Here is an example of markmin text: You can use the extra parameter of auth.wiki to pass extra rendering rules to the MARKMIN helper. The blockage for me is that the documentation is somewhat disconnected in that none of the examples are in the context of web2py environment e.g.whether and how to use pdf.output vs response.stream . To edit or delete a single record, click on the record id number. web2py also comes with a wizard, described later in this chapter, that can write an alternate scaffolding code for you based on layouts and plugins available on the web and based on high level description of the models. If the counter is there, we ask web2py to increase the counter by 1. Proceed to create a view for the index action. You can change color, columns, size, borders and background without editing the HTML. Finally here is the code for the view "default/search.html": which generates the following Ajax search form: You can also try to call the callback action directly by visiting, for example, the following URL: If you look at the page source you see the HTML returned by the callback: Generating an RSS feed of your wiki pages using web2py is easy because web2py includes gluon.contrib.rss2. web2py also includes feedparser to read third-party feeds. Because of the IS_IN_DB validator, the reference field "image_id" is rendered by a drop-down menu. Edit the "db.py" file by clicking the corresponding "edit" button: Line 1 defines a global variable called db that represents the database connection. Notice that the admin application includes "plugin_jqmobile" which packages jQuery Mobile. When programming web2py, you will inevitably make mistakes and introduce bugs. It is designed to help you by providing an easy access to the database. Nebylo-li heslo zadáno nebo jestliže jste soubor "parameters_8000.py" smazali, přístup do webového administračního rozhraní Normally there is no need to perform any configuration of admin but a few customizations are possible. These are written respectively in the ABOUT and LICENSE files in the application folder. licensed under, Complete Reference Manual, 6th Edition (pre-release). Anyway thanks again, you've put me on the right track – mhavel Sep 22 '12 at 18:49 Specifically we want to create: Go back to the edit page and edit the "default.py" controller, replacing its contents with the following: This action returns a dictionary. • response.cookies: similar to request.cookies, but while the latter contains the cookies sent from the client to the server, the former contains cookies sent by the server to the client. You can change the name of the file, as well as the name of the global variable db, but it is convenient to give them the same name, to make it easy to remember. Lost password; Create your account; matplotlib howto. If you benefit from web2py hope you feel encouraged to pay it forward by contributing back to society in whatever form you choose! Views (12421) Favorite (0) Like (2) Dislike (0) Subscribe (0) first draft. A "show/[id]" page that shows the visitor the requested image and allows the visitor to view and post comments. Their unnamed arguments are interpreted as objects to be serialized and inserted in the tag's innerHTML. Copyright © 2020 by Massimo Di Pierro, IDEs usually have their own inter-process debugger, e.g. As before, from the site page in admin, create a new application called images, and navigate to the edit page: We start by creating a model, a representation of the persistent data in the application (the images to upload, their names, and the comments). Any operation performed on a file via the admin interface (create, edit, delete) can be performed directly from the shell using your favorite editor. The image below shows the output of the test page for the welcome application. We could have used a different mechanism and passed data as part of a redirect URL: Then modify the "default/second.html" view: Mind that in general it is not a good idea to pass data from one action to another using the URL. In this case the tests verify that the index action runs without errors. return response. For example: Mind that by default English is not translated because web2py assumes the applications are written in English. Here is an example: Each line a menu item. You have used the edit page already in this chapter. If the URL has an image extension, the link is embedded as an image, If the URL has an audio extension, the link is embedded as HTML5 audio, If the URL has a video extension, the link is embedded as HTML5 video. When static files are downloaded, web2py does not create a session, nor does it issue a cookie or execute the models. response.stream(file, chunk_size): quando un controller ritorna questo valore web2py invia il contenuto al client in blocchi delle dimensioni di chunk_size. By setting sanitize=True, you tell web2py to escape unsafe XML tags such as "