[novice question] Render a list of objects

[Sudeep Gopal]

Hello, 

I am new to django. 

I am using django forms in my project and I am not using django models. 

From the user,  my django form asks for 4 inputs :- signal_to_noise_1 , signal_to_noise_2, bandwidth1 and bandwidth2. 

Based on these values I use my  look up table and I create a results which are 2 lists of records.

 Each list has approximately 40 to 50 records. Each record has 8 fields. (field1,...field8) ...

Each list looks like this (if my description is not clear) field1 is unique. 

field1	field2	field3					field8

Both the lists (with each list having about 50 records) are in my django view. 

From what I read online, I can use the render() method which has a dictionary called context. (https://docs.djangoproject.com/en/2.2/ref/templates/api/#rendering-a-context)

I am not sure how to convert these list of record objects to this dictionary format which has {"name":value} pair. 

Even the django tables requires it in the dictionary format.....

The nearest thing which I found was https://stackoverflow.com/questions/9388064/django-template-turn-array-into-html-table 

But I did not understand what exactly the below syntax does and how I can customize it to my usecase ....any input would be greatly appreciated ...

<table>
  {% for r in results %}
    {% cycle '<tr>' '' '' '' %}
      <td>{{r.content}}</td>
    {% cycle '' '' '' '</tr>' %}
  {% endfor %}
</table>

[Joe Reitman]

The example code you provided will create a <tr> on the first iteration of the loop and </tr> tag every 4th iteration of the loop. This cycle will continue resulting in a table with 4 columns of data. Example:

results = [ 1, 2, 3, 4, 5, 6, 7, 8 ]

<table>
  <tr>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>4</td>
  </tr>
  <tr>
    <td>5</td>
    <td>6</td>
    <td>7</td>
    <td>8</td>
  </tr>
</table>

If you have 2 lists, render them from your view like return render(request, 'polls/detail.html', {'list1': list1, 'list2': list2})

In your template create an 8 column table:

<table>
  {% for r in list1 %}
    {% cycle '<tr>' '' '' '' '' '' '' ''%}
      <td>{{r}}</td>

    {% cycle '' '' '' '' '' '' '' '</tr>' %}
  {% endfor %}

{% for r in list2 %}
    {% cycle '<tr>' '' '' '' '' '' '' ''%}
      <td>{{r}}</td>

    {% cycle '' '' '' '' '' '' '' '</tr>' %}
  {% endfor %}

</table>

Hope this helps

[Sudeep Gopal]

Thank you so much Joe...

I was actually able to go forward. 

With the below code  :-

<table>
  {% for r in list1 %}
    {% cycle '<tr>' '' '' '' '' '' '' ''%}
      <td>{{r}}</td>
    {% cycle '' '' '' '' '' '' '' '</tr>' %}
  {% endfor %}

The {{r}} in the above code , gives only the reference or the pointer value. For eg, template cannot recognize it is field1 which I want to display or something,,,

How do we get the value of that reference ?

My result look like this :-

field1	field2	field3	field4	field5	field6	field7
<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005393FD0>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x000000000581B550>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x000000000581B278>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005413908>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000053C27F0>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000053C20B8>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000053C2278>
<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005594F28>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005413668>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005413358>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x0000000005413DA0>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000054DDF98>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000053C2978>	<TDMAsearch.TDMAsearchutils.TDMAInroute object at 0x00000000055943C8>

I want it to look at the content 

CARRIER1	230	128	QPSK	1000	125	155
CARRIER2	230	256	QAM	1000	125	155

[Sudeep Gopal]

Update .... This worked for me..Thanks a lot for your help....:- 

<table> <th>FIELD1</th> <th>FIELD2</th> <th>FIELD3</th> <th>FIELD4</th> <th>FIELD5</th> <th>FIELD6</th> <th>FIELD7</th> <th>FIELD8</th> {% for r in ret_list %} <tr> <td> {{r.field1}} </td> <td> {{r.field2}} </td> <td> {{r.field3}} </td> <td> {{r.field4}}</td> <td> {{r.field5}} </td> <td> {{r.field6}} </td> <td> {{r.field7}} </td> <td> {{r.field8 }} </td> </tr> {% endfor %} </table>