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Thread: How do you nest two loops within a template?
How do you nest two loops within a template?
user name
 2006-10-31 16:16:05 
As a newbie to Python, I can't see how one can nest two
loops within a 
template.  Taking the template below, I have an additional
list which I 
need to iterate over  in order to display a single figure
for the last 
cell in each table row.

Currently, if I add a for loop to the last cell (eg.  {% for
b in 
balance %} {} {% endfor %} ), I get all the values of
the list in 
the cell - which is not want I want.

The documentation mentions a forloop.parentloop but I'm not
sure  how to 
apply this or whether it is the solution.   Can anybody
help?

MerMer

<table>
{% for cash in transfers %}
<tr>
<td>{{ cash.date }}</td>
<td>{{ cash.source }}</td>
<td>{{ cash.credit }}</td>
<td>{{ cash.debit }}</td>
<td>  {} </td>

{% endfor %}
</table>



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How do you nest two loops within a template?
user name
 2006-10-31 16:16:05 
As a newbie to Python, I can't see how one can nest two
loops within a 
template.  Taking the template below, I have an additional
list which I 
need to iterate over  in order to display a single figure
for the last 
cell in each table row.

Currently, if I add a for loop to the last cell (eg.  {% for
b in 
balance %} {} {% endfor %} ), I get all the values of
the list in 
the cell - which is not want I want.

The documentation mentions a forloop.parentloop but I'm not
sure  how to 
apply this or whether it is the solution.   Can anybody
help?

MerMer

<table>
{% for cash in transfers %}
<tr>
<td>{{ cash.date }}</td>
<td>{{ cash.source }}</td>
<td>{{ cash.credit }}</td>
<td>{{ cash.debit }}</td>
<td>  {} </td>

{% endfor %}
</table>



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How do you nest two loops within a template?
user name
 2006-10-31 17:06:57 

  


  

    This is one of those things that just isn't exceptionally straightfoward to accomplish.

From within a template, and without extensions, I can't think of how you would do that immediately. It sounds like you have a relatively simple set of data, so I'd recommend instead on "tweaking" the data you have in the view prior to sending it to the template to be rendered.


Within the view, loop through your values for "b&quot; that match up with each of the transfers, and assign a new variable (maybe "b&quot;) to each transfer as you go through the list - then you can reference it in the one loop:


{% for cash in transfers %}
...
<;td>{{ cash.credit }}</td&gt;
<td&gt;{{ cash.debit }}</td&gt;

<td>{{ cash.b }}</td&gt;
{% endfor %}


There are a couple of other references for how to display tabular data, both of which boil down to extending the tags - either with a TemplateTag or a Filter. 


-joe

On 10/31/06, Merric Mercer < merrichiveonline.co.uk">merrichiveonline.co.uk> wrote:


As a newbie to Python, I can't see how one can nest two loops within a
template. &nbsp;Taking the template below, I have an additional list which I
need to iterate over  in order to display a single figure for the last

cell in each table row.

Currently, if I add a for loop to the last cell (eg.  {% for b in
balance %} {} {% endfor %} ), I get all the values of the list in
the cell - which is not want I want.


The documentation mentions a forloop.parentloop but I'm not sure  how to
apply this or whether it is the solution.&nbsp;  Can anybody help?

MerMer

<table>
{% for cash in transfers %}
<tr&gt;

<td>{{ cash.date }}</td&gt;
<td&gt;{{ cash.source }}</td&gt;
<td&gt;{{ cash.credit }}</td&gt;
<td&gt;{{ cash.debit }}</td&gt;
<td&gt; &nbsp;{} </td>;

{% endfor %}
</table>






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    How do you nest two loops within a
template?
  


  

     user name

     2006-10-31 18:43:39
  


  

    
Joe,

My orginal code (see the inclusion tag below ) was returning
a Query
Set and an interable list.   I can't understand how I can
loop through
the Query set and append the data to the end - as there is
no matching
attribute in the Query set.

 I am looking to return a query set and build a table from
it.  The
last column in the table is the sum of the all the previous
rows.
Here's an example.

credit   Balance
50          50
40          90
50        140


Here's my orginal inclusion tag


register.inclusion_tag('cashtransfer.html')
def show_cash_transfer(username):
    balance=[]
    x=0
    qs=CashTransfer.objects.filter(user=username)
    qs1=qs[0]
    for cash in qs:
        x=cash.credit+x
        balance.append(x)
    return { 'transfers': qs, 'balance': balance }


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    How do you nest two loops within a
template?
  


  

     user name

     2006-10-31 19:16:39
  


  

    
I found out that I needed to change the query set to a list,
then I
could append new data to the end and return this.  The
following is the
ammeded inclusion tag.

register.inclusion_tag('cashtransfer.html')
def show_cash_transfer(username):
    balance=[]
    x=0
    y=0
    qs=CashTransfer.objects.filter(user=username)
    item=list(qs) # convert the queery into a list
    for cash in item:
        x=item[y].credit+x
        item[y].balance=x  #as a list we are able to append
the data
        y=y+1
    return { 'transfers': item }


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