Goal: {% for loop %} over a list (using Jinja2) and then print out results {{print}} in a HTML table using Bootstrap.
Problem: List is not printing in the template.
In the view_config, I used query .all() to return a list of all the assessment_results objects. They are returning... I confirmed this via terminal/print debugging. However, the for loop is not returning the values needed to populate a table; as read in Jinja2 tutorial. I don't think I need to use a for loop in the view_config as I have seen others do (see here), but I am new to this and am trying to figure out how these two programs (SQLALCHEMY and Jinja2) interact.
An example from the printout after using .all() mentioned above:
[<Assessment_Result(owner='<User(username ='baseball', firstname ='Jen', lastname ='See', email='girl#aol.com')>', assessment='<Assessment(name='Becoming a Leader', text='better decisions')>')>]
view_config code:
views.py
#view_config(route_name='assessment_results', request_method='GET', renderer='templates/assessment_results.jinja2')
def all_assessment_results(request):
with transaction.manager: # < --- THIS WAS THE ISSUE !
assessment_results = api.retrieve_assessment_results()
if not assessment_results:
raise HTTPNotFound()
return {'assessment_results': assessment_results}
Corresponding Jinja2 template using Bootstrap:
assessment_results.jinja2
<div class="container">
<table class="table table-hover">
<thead>
<tr>
<td> Assessment ID </td>
<td> Assessment </td>
<td> Owner </td>
</tr>
</thead>
<tbody>
<tr>
{% for x in assessment_results %}
<td>{{ x.assessments|e }}</td>
<td>{{ x.owners|e}}</td>
{% else %}
<td><em>no users found</em></td>
{% endfor %}
</tr>
</tbody>
</table>
</div>
You should look at the documentation
http://jinja.pocoo.org/docs/dev/templates/#for
You want to iterate over a dict, so consider using iteritems, itervalues or what ever you want.
Also note that your query will not return a dict, it will return a list or rows that matched.
I am also not sure if the for-else works in jinja. But you should avoid using that anyways.
Related
I have modeled my database using models.py within my django project, one of the fields is a JSONField and I can save json data into that field without any problem. My doubt comes in how I can show that information as an html table. At the moment I have been using ListView to show that information in a template but I don't know how to transform it into a table.
If you use object.json_field.items you can loop through them just like a normal dictonary / can also use .keys and .values
Example use in a table
<table>
<thead>
<tr>
<th>Key</th>
<th>Value</th>
</tr>
</thead>
<tbody>
{% for k, v in object.json_field.items %}
<tr>
<th>{{k}}</th>
<th>{{v}}</th>
</tr>
{% endfor %}
</tbody>
</table>
I am creating a call reports dashboard in django, and I want to output a postgresql Select query in an HTML table for each date of the month like this:
And this is the output that I am receiving. It is just giving me totals for each extension for the month in each table instead of the total for that distinct date. I tried to change the query to
For whatever reason I am having a very hard time figuring this out. This is my HTML, I know I am not doing the looping right here, I've just been running out of ideas.
{% for i in lt.itertuples %}
<table class="table" style="float:left">
<caption>{{ i.to_date }}</caption>
<thead>
<tr>
<th>Extension</th>
<th>Calls</th>
</tr>
</thead>
{% for d in df4.itertuples %}
<tr>
<td>
{{ d.member_extension }}
</td>
<td>
{{ d.count }}
</td>
</tr>
{% endfor %}
</table>
{% endfor %}
</div>
And this is a snippet of my Python:
query=pd.read_sql_query("select DISTINCT date(start_date) as 'DATE()' from Reports3; ",con3)
query2=pd.read_sql_query("SELECT COUNT(*),member_extension from Reports3 group by member_extension ",con3)
df4 = pd.DataFrame(query)
lt = pd.DataFrame(query2)
ext4=pd.unique(df4['member_extension'])
context={'df4':df4, 'ex4':ext4, 'lt':lt }
return render(request,'index2.html',context)
I tried changing the Query to:
SELECT DISTINCT TO_DATE(start_date,'YYYY-MM-DD'), COUNT(*),member_extension from Reports3 group by member_extension,TO_DATE(start_date,'YYYY-MM-DD') ORDER BY TO_DATE(start_date,'YYYY-MM-DD')
And that outputs this result:
I have data in the following (simplified) format:
MetricData(models.Model) with following fields: id, metric, date, facility, value
Now I want to create a table with the following format (execute the script to get the indented output table):
<table style="width:100%">
<tr>
<th>Date</th>
<th>Facility 1</th>
<th>Facility 2</th>
<th>Facility 3</th>
</tr>
<tr>
<td>03/2019</td>
<td>1.0</td>
<td>1.5</td>
<td>2.5</td>
</tr>
<tr>
<td>04/2019</td>
<td>1.5</td>
<td>1.5</td>
<td>2.0</td>
</tr>
</table>
As you can see, the number of facilities which is dynamic (new ones can be added to the database), are the column headers. For each facility there will be metric data in the database.
All examples from django-datatables-view I find are basically using models directly and one model entry is converted to one table row.
You can override the QuerySet for your model to get a list of headers:
class MetricDataQuerySet(models.QuerySet):
#property
def headers(self):
return [getattr(instance, self.model.header_column) for instance in self]
class MetricData(models.Model):
header_column = 'facility'
...
objects = MetricDataQuerySet.as_manager()
Notice I added the header_column, instead of hard coding facility in the QuerySet. This allows you to reuse the QuerySet for different models if you end up needing to.
Now, in your view:
def some_view(request):
...
context = {
'objects': MetricData.objects.all()
}
return render(request, 'some_template.html', context)
Finally, on some_template.html, you can do this:
<table>
<tr>
{% for header in objects.headers %}
<th>{{ header }}</th>
{% endfor %}
</tr>
{% for object in objects %}
<tr>
<td>row.date</td>
<td>row.metric</td>
<td>row.value</td>
</tr>
{% endfor %}
</table>
There is a char field named json_field in Django Model. I am trying to iterate it from the view but it returns only one result as the return statement does. I am trying to figure it out how I can iterate json_field using yield.
the result that Model Object returns like:
id : 1
title : "Some Title"
json_field : [{"key":"value","key2":"value2"},{"key":"value","key2":"value2"}]
created : "Sat Oct 21 2017 14:00:53 GMT+0300 (+03)"
view.py
import json
def MyView(request):
model_query = MyModel.objects.all() or MyModel.objects.filter or exclude...
for item in model_query:
data_item = json.loads(item.json_field)
template = "template.html"
context = {"title":title, "data_item":data_item}
return render(request, template, context)
in template.html
{% for query_item in model_query %}
<table>
<thead>
<tr>
<th>{{ query_item.title }} - {{ query_item.created }}</th>
</tr>
</thead>
<tbody>
<tr>
<th>Some Heading </th>
<th>Some Heading </th>
</tr>
<!-- json data -->
{% for item in data_item %}
<tr>
<th>{{ item.key }}</th>
<td>{{ item.key2|floatformat:2 }}</td>
</tr>
{% endfor %}
<!-- json data -->
</thead>
</table><
{% endfor %}
Any help will be appreciated.
You can prepare dataset for you template.
# Fetch data from db as queryset of dicts
items = list(MyModel.objects.filter().values('title', 'created', 'json_field'))
# Decode json in-place
for item in items:
item['json_field'] = json.loads(item['json_field'])
context = {"title":title, "items": items}
Then interate through items inside your template:
{% for item in items %}
<table>
<thead>
<tr>
<th>{{ item.title }} - {{ item.created }}</th>
</tr>
</thead>
<tbody>
<tr>
<th>Some Heading </th>
<th>Some Heading </th>
</tr>
<!-- json data -->
{% for entry in item.json_field %}
<tr>
<th>{{ entry.key }}</th>
<td>{{ entry.key2|floatformat:2 }}</td>
</tr>
{% endfor %}
<!-- json data -->
</thead>
</table><
{% endfor %}
If you're using PostgreSQL, you can using JSONField. It uses the postgres's jsonb type, which is optimized for keeping a json serializable text.
If not, you still can use django-jsonfield. It almost gives the same functionality, even though some of the cool features of django's JSONField are not available (like this kind of lookups).
If none of these work for you, you can also implement your own JSONField by inheriting from CharField or TextField, and overriding some of the functions. This way, you won't need any of the logics of your field in your views.
Edit:
If you find changing your field hard or don't wanna do it for whatever reason, you can do this in your view:
for item in model_query:
item.loaded_json = json.loads(item.json_field)
then you can use it like a normal field in your template:
{% for query_item in model_query %}
{% for item in query_item.loaded_json %}
<span>{{ item.key }}</spam>
{% endfor %}
{% endfor %}
Hello!
The solution depends on your purposes.
Use comprehensions if you want to construct a list of json arrays:
data_items = [json.loads(item.json_field) for item in model_query]
... or generator of json array:
data_items = (json.loads(item.json_field) for item in model_query)
If you want to have a single array of json objects try this:
data_items = []
for item in model_query:
data_items.extend(json.loads(item.json_field))
Then you can use data_items as a template context.
A little tip: You can utilize JSONField at ORM level if you use PostgreSQL or MySQL. Consider this approach if you plan to make any filter queries on this field. As additional benefit JSON encoding/decoding will be out of box.
Thanks for updating your code!
Now I would restructure the json.load() list of dicts so you can use it. That is better style than mangling in the template.
concatenation is done by:
my_dict = dict()
for d in data_item
my_dict.update( d )
if you want to merge, check this thread:
How to merge two dictionaries in a single expression?
"Simple" problem here which would already be solved in a view... But I didn't find a way to do it.
So here is the idea; I have Anonymous1, Anymous2... Anymous3 who received calls and communications times on phone numbers. I want to do for each of them a table like that :
Number | Calls | Communication time
2-xxx-x 1 01:00:00
3-xxx-x 23 00:30:00
total 24 01:30:00
Number of calls, communication time and total are all computed in the view, as it has to be dedicated to. I have a list of dictionnaries which contains all the numbers with the numbers of calls, the communication time and its owner. It is looking like that :
list = [{'number':2-xxx-x ,'owner':Anonymous1' ,'calls':1 ,'communication time':datetime object},...]
Why a list of dictionnaries ? Because I am using the regroup template tags as described in the documentation: https://docs.djangoproject.com/fr/1.9/ref/templates/builtins/#regroup
I also make a dictionnary which contains only the total number of calls, the total communication time and the owner; I am using it to compute the sum of each column. Here is it how it looks like :
second_dict = {'Anonymous1':{'calls':24,'communication_time':datetime object}}
To access them, I am using loops in my html code, which is where I have a problem. To create the table, I am regrouping the list of dictionnaries by their owner and performing loops and I am using the dictionnary to make th:
{% regroup list by owner as owner_list %}
{% for owner in owner_list %}
<table class="display" cellspacing="0" style="position: relative; left: -250px;">
<caption> {{owner.grouper}}</caption>
<thead>
<tr>
<th> {% trans "Number" %} </th>
<th> {% trans "Calls"%}</th>
<th> {% trans "Communication time" %}</th>
</tr>
</thead>
<tbody>
{% for item in owner.list%}
<tr>
<td>{{item.number}}</td>
<td>{{item.calls}}</td>
<td>{{item.communication_time}}</td>
</tr>
{% endfor %}
<tr>
{% with owner.list.0.owner as owner_name %}
<td><b>{% trans "Total" %}</b></td>
<td>{{second_dict.owner_name.calls}} </td>
<td> {{second_dict.owner_name.communication_time}} </td>
{% endwith %}
</tr>
</tbody>
</table>
{% endfor %}
As you can see with the code, I want to access the second dictionary values with owner as a key, following what is described here : https://docs.djangoproject.com/en/dev/ref/templates/api/
The problem is... this is not working at all ! I was thinking it was a str/unicode problem, but moving from one to the other when creating the different dictionnaries in the python views did not change anything.
Anyone got an hint on how to solve this ?
You cannot do lookup in a dictionary in template using a variable, dict in template would always treat what's after the dot as a string lookup like second_dict['owner_name']. You need to write a template filter to do it. Check django doc on how to write custom filter.