Flask-WTF: how to pass a structured object to a form

Question

I am new to python framework and jar.

My problem is that I have to do an edit page. Therefore, I need to transfer all the information about the object to the form. Detail:

My object has this structure:

class TVChannel(Document): __collection__ = 'tvchannels' use_dot_notation = True structure = { '_id' : basestring, 'name' : unicode, 'streams' : { 'city1': { 'adapt' : basestring, 'hds' : basestring, 'hls' : basestring, 'rtmp' : basestring, }, 'city2': { 'adapt' : basestring, 'hds' : basestring, 'hls' : basestring, 'rtmp' : basestring, } } } 

and in view:

 channel_obj = db.TVChannel().get_id(channel_id) #load a channel datas into an object from db channel = ChannelForm(request.form, obj=channel_obj) #load channel form return render_template('channel/new.html',form=channel, channel_id=channel_id) 

The object_channel "name" they understand and pass it on, as usual. But the “streams”, they did not recognize and conveyed it something like this:

 class ChannelForm(Form): _id = HiddenField() name = TextField(_('channel name')) streams = { 'city1': { 'adapt' : TextField(_('stream adapt link')), 'hds' : TextField(_('stream hds link')), 'hls' : TextField(_('stream hls link')), 'rtmp' : TextField(_('stream rtmp link')), }, 'city2': { 'adapt' : TextField(_('stream adapt link')), 'hds' : TextField(_('stream hds link')), 'hls' : TextField(_('stream hls link')), 'rtmp' : TextField(_('stream rtmp link')), } } submit = SubmitField(_('Save')) 

What should I do? Or, anyway, change the way the object data is transferred to this form parameter?

Answer 1

Well found this in the documentation, and I will use it now:

in view:

 channel_obj = db.TVChannel().get_id(channel_id) #load a channel infos into an object channel = ChannelForm(request.form, obj=channel_obj) #load channel form channel.CITY1adapt.process_data(channel_obj.streams['City1']['adapt']) #and others links 

And in the form:

 class ChannelForm(Form): _id = HiddenField() name = TextField(_('channel name')) CITY1adapt = TextField(_('adapt link')) CITY2adapt = TextField(_('adapt link')) #and so on submit = SubmitField(_('Save')) 

Now I work when I “save” them.

Answer 2

You can use nested forms using wtforms.fields.FormField . In your case, it will be something like this:

 class CitiForm(Form): adapt = TextField(_('stream adapt link')) hds = TextField(_('stream hds link')) hls = TextField(_('stream hls link')) rtmp = TextField(_('stream rtmp link')) class ChannelForm(Form): _id = HiddenField() name = TextField(_('channel name')) city1 = FormField(CitiForm) city2 = FormField(CitiForm)