template tag help please?

[MikeKJ]

I want to pass 2 variables to a templatetag from within a template, a name and a date (eg, John 29/09/2018) to output the result of the templatetag def.

The reason I want to do this is:

From a list of all names:

The name comes from a model that has a foreign key to another model that has actions performed by that name by date and I want to output the action taken on that date so something like:

from django import template
from django.conf import settings
from django.utils.html import escape
from user.models import person
from action.models import data

def (get_action):

    action = Data.objects.get.filter(person=name).filter(date=date)

    return action

but how do I pass the variables in the 1st place please?

[Mikhailo Keda]

Check the documentation - https://docs.djangoproject.com/ko/2.1/howto/custom-template-tags/

[Mike Jones]

Yes

 

For example, in the filter {{ var|foo:"bar" }}, the filter foo would be passed the variable var and the argument "bar".

 

I want to pass 2 (maybe 3) variables and correct me if I am wrong but

Custom filters are just Python functions that take one or two arguments:

 

So could do  {{ var|foo:”bar, bar2” }}

or {{ var|foo:”bar” “bar2” }}   and pass 2 arguments?   The doc doesn’t specify

 

I assume if 2 args

def cut(value, arg1, arg2):

 

?

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[MikeKJ]

[Mikhailo Keda]

"Then in the template any number of arguments, separated by spaces, may be passed to the template tag." from the Documentation

[MikeKJ]

I am so rusty I’m having trouble writing a simple_tag

 

In the template

 

{% for b in list %}

{% load get_cost %}{% do_cost {{ b.name }} avn avd %}

 

Also tried (per docs) {% do_cost name={{ b.name }} avn=avn avd=avd %}

I definitely have values in the template passed from the view for avn and avd and of course b.name

 

Tag

from django import template

from django.conf import settings

from django.utils.html import escape

from band.models import Data

 

register = template.Library()

 

@register.simple_tag

def do_cost( name, avn, avd, *args, **kwargs ):

    avn = kwargs['avn']

    avd = kwargs['avd']

    name = kwargs['name']

 

    val = Data.objects.filter(property=name).filter(date_period=date)

    return val

 

I just keep getting do_cost takes 3 arguments

*** I know I want it to take 3 arguments!!!!***

Is it telling me that I can’t use {{ b.name }} as an arg?

[Andréas Kühne]

Hi,

You don't need the {{}} when sending a variable to the template tag - try removing them.

Regards,

Andréas

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[MikeKJ]

Thank you Andreas Kuhne, progress

 

So this {% load get_cost %}{% do_cost b.name avn avd %} was working quite happily but for some reason is now complaining

Exception Type:	TemplateSyntaxError
Exception Value:	Caught KeyError while rendering: 'avn'

Exception Location claims to be    get_cost.py in do_cost, line 10  which is avn = kwargs['avn']

but the exception is in the template line {% load get_cost %}{% do_cost b.name avn avd %}

[Andréas Kühne]

Wait a secound, you are doing some very strange things....

I didn't see this before.

You have defined the following:

@register.simple_tag
def do_cost( name, avn, avd, *args, **kwargs ):
    avn = kwargs['avn']
    avd = kwargs['avd']
    name = kwargs['name']

    return name

The method has 3 parameters that you are sending to it - name, avn and avd. They correspond to the values sent to the method in order. So you don't need to use the kwargs dictionary - it's unnecessary...

You could just write:

@register.simple_tag
def do_cost( name, avn, avd, *args, **kwargs ):

    return name

Beacause you have sent the name to the method?

Regards,

Andréas

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[Mike Jones]

Ah I was just doing that to prove it was working

 

This is the actual tag

 

from django import template

from django.conf import settings

from django.utils.html import escape

from band.models import Data

 

register = template.Library()

 

@register.simple_tag

def do_cost( name, avn, avd, *args, **kwargs ):

    avn = kwargs['avn']

    avd = kwargs['avd']

    name = kwargs['name']

    val_set = Data.objects.filter(prop = name).filter(date_period=avd)

    avn = 7  #this line is just for testing

    if avn >= 7:

        for x in val_set:

            val = x.full

    else:

        for x in val_set:

            val = x.short

    return val

 

From: django...@googlegroups.com [mailto:django...@googlegroups.com] On Behalf Of Andréas Kühne
Sent: 22 August 2018 15:20
To: django...@googlegroups.com
Subject: Re: template tag help please?

 

Wait a secound, you are doing some very strange things....

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[Andréas Kühne]

Yes - but you still are doing it strange - you shouldn't use kwargs if you are sending the parameters and have the parameters in the function - use the parameters.

In other words: 

    avn = kwargs['avn']

    avd = kwargs['avd']

    name = kwargs['name']

That is unnecessary....

Regards,

Andréas

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[Mike Jones]

Andreas, 

Thank you for your help and patience I have got the damned thing working!! 

It helped that I remembered that one of the filter arguments was actually a foreign key in the model and had to be an integer id not a string,  that was being obfuscated by being a templatetag call.

 

Thank you

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[Tosin Ayoola]

good day please i'm having issues, attached below is one of the error i'm getting also ive been trying to add bootstrap glyphicon to my project but it just display the text without the glyphicon,

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[ireoluwa fakeye]

You Are not properly routing your  urls

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[Tosin Ayoola]

not properly routing my urls as in, i don't understand

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[ireoluwa fakeye]

Sorry didn't look at it well ,can I see a screen shot of your code

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[Tosin Ayoola]

i have the code on git actually because i'm trying to get the add a file at the admin page but i'm getting the error

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[Tosin Ayoola]

this is the link https://github.com/olaneat/ask_the_schools will rili b glad if u can help

[Tosin Ayoola]

good day guys I'm working on a project but currently I'm having
issues, which is I created a model to save some images files & I
created a template to display the images but the issue now is for loop
isn't displaying the files at the template

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