9

In my Django project I need to have tables which columns are dynamic and depend on what is in the database. So I found a solution in here and it works but with a little problem. Here's the class with a table I'm extending dynamically:

class ClientsTable(tables.Table):
    class Meta:
        model = Client
        attrs = {"class": "paleblue", "orderable":"True", "width":"100%"}
        fields = ('name',)

    def __init__(self, *args, **kwargs):
        super(ClientsTable, self).__init__(*args, **kwargs)
        self.counter = itertools.count()

    def render_row_number(self):
        return '%d' % next(self.counter)

    def render_id(self, value):
        return '%s' % value

And here is the method that extends the class:

def define_table(roles):
    attrs = dict((r.name, tables.Column() for r in roles)
    klass = type('DynamicTable', (ClientsTable,), attrs)
    return klass

When I'm creating a table in views.py like this:

table = define_table(roles)(queryset)

The table shows columns like I wanted, but in the html code I see that it ignored the attrs: 

{"class": "paleblue", "orderable":"True", "width":"100%"}

So there is no css style for paleblue, which is important to me. I feel that it might be something with Meta class but fields and model are working, so I have no idea why attrs are not.

Community
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copinette
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2 Answers2

10

For anyone looking for this now, from django-tables2 1.10 you add columns dynamically to a table by passing extra_columns to the Table constructor.

extra_columns should be a list of tuples, defining a column name and a Column object, eg.

class MyTable(Table):
    static_column = Column()

mytable = MyTable(extra_columns=[('dynamic_column', Column())]

See the API documentation at: http://django-tables2.readthedocs.io/en/latest/pages/api-reference.html#django_tables2.tables.Table

Alice Heaton
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7

First of all, meta options are not inherited in django-tables2. So you may check the workarounds discussed in the issue to see if something fits or you can manuall add a Meta class to your dynamic table. To do that, you can your define_table method like this:

def define_table(roles):
  attrs = dict((r.name, tables.Column() for r in roles)
  attrs['Meta'] = type('Meta', (), dict(attrs={"class":"paleblue", "orderable":"True", "width":"100%"}) )
  return klass

Oops after more than two years I noticed that there was an error in my code -- I'd forgotten to include the line klass = type('DynamicTable', (ClientsTable,), attrs) before return klass above. I'm, adding it now for completeness.

Serafeim
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  • Nice stuff! Not exactly addressing my issue, but I could modify your snippet to solve my problem and learned a lot about Python `type` and meta class action. Thx a bunch! – user2390182 Apr 28 '16 at 14:11
  • Glad I helped! I've also written various posts doing stuff with type at my blog: http://spapas.github.io/category/django.html – Serafeim Apr 28 '16 at 15:17