Django template tags to update, remove or append url get parameter

url_parameters

from django import template

register = template.Library()


@register.simple_tag(takes_context=True)
def query_transform(context, **kwargs):
    query = context.request.GET.copy()
    for key, value in kwargs.items():
        query[key] = value
    return query.urlencode()


@register.simple_tag(takes_context=True)
def replace_url_get_parameter(context, base_url, get_parameter, value):
    """
        Replaces all existing get parameters with the one with the given value.
        Adds the given parameter if it does not exists.
    """
    current = context.request.GET.copy()
    if get_parameter in current:
        current.pop(get_parameter)
    current.update({get_parameter: value})
    result = f'{base_url}?{current.urlencode()}'
    return result


@register.simple_tag(takes_context=True)
def remove_url_get_parameters(context, base_url, get_parameters):
    """
        Totally removes all specified get parameter/s
        Could be a single parameter or multiple comma separated parameters
    """
    current = context.request.GET.copy()
    parameters_list = get_parameters.split(',')
    for parameter in parameters_list:
        if parameter in current:
            current.pop(parameter)
    result = f'{base_url}?{current.urlencode()}'
    return result


@register.simple_tag(takes_context=True)
def append_url_get_parameter(context, base_url, get_parameter, value):
    """
        Appends value to given get parameter
        If it does not exist - creates it.
    """
    current = context.request.GET.copy()
    current.update({get_parameter: value})
    result = f'{base_url}?{current.urlencode()}'
    return result


@register.simple_tag(takes_context=True)
def toggle_url_get_parameter(context, base_url, get_parameter, value):
    """
        If the given value of given parameter is in parameter list - removes it.
        Else appends it.
    """
    value_str = str(value)
    current = context.request.GET.copy()
    params_list = []
    if get_parameter in current:
        params_list = current.pop(get_parameter)
    if value_str in params_list:
        params_list = [item for item in params_list if item != value_str]
    else:
        params_list.append(value_str)
    for parameter_value in params_list:
        current.update({get_parameter: parameter_value})
    if current:
        result = f'{base_url}?{current.urlencode()}'
    else:
        result = f'{base_url}'
    return result