Having trouble writing loop in Django template

[shaw...@gmail.com]

Hello guys I am currently working on django views and templates and met some problems. I have a model named 'metabolites', which contains: id, name, compartment, charge and formula 5 components. I have another model named 'Reactionsmeta', which contains: id(reactions), name, metabolie1, metabolite2, .... metabolite6. The table of this model is not filled complete, because sometimes one id corresponds to 5 metabolites, but sometimes even 20.

I write a template which can displays all the reaction, when I click on the reaction and enter the detail page, I also want to display the metabolites that involve in this reactions. My views.py and templates are written as below:

reactions_detail.html

{% extends 'Recon/Base.html' %}
{% load static %}
{% block title %}Reaction Details{% endblock %}
{% block body %}
<h1>{{ reactionsmeta.id }}</h1>
<h2>{{ reactionsmeta.name}}</h2>
<!-- Left Album Info -->
<div class="col-sm-4 col-md-3">
    <div class="panel panel-default">
        <div class="panel-body">
            <a href="{% url 'detail_reaction' reactionsmeta.id %}">
                {% if reactionsmeta.id %}
                    <img src="{% static "Recon/images/Logo-Technische-Universiteit-Eindhoven.jpg" %}" class="img-responsive">
                {% else %}
                    <h3>No image to display</h3>
                {% endif %}
            </a>
            <h1>{{ reactionsmeta.id }} <small>{{ reactionsmeta.name }}</small></h1>
        </div>
    </div>
</div>

views.py
from django.views import generic
from .models import Reactionsmeta,Metabolites,Reactions
from django.shortcuts import render


class IndexView(generic.ListView):
template_name = 'Recon/index.html'
context_object_name = 'Reactions_object'

def get_queryset(self):
    return Reactionsmeta.objects.all()


class DetailsView(generic.DetailView):
model = Reactionsmeta
template_name = 'Recon/reactions_detail.html'

def get_context_data(self, **kwargs):
    context = super(DetailsView, self).get_context_data(**kwargs)
    context['metabolite'] = Metabolites.objects.all()
    context['reactions'] = Reactions.objects.all()

    # And so on for more models
    return context

How can I write the loop in reaction_detail.html???