Parsing json returned in django modelformset in template
One of the fields returned to my template in a formset generated by modelformset_factory() is a JSONField. I'd like to parse the json and display elements in it separately within the form, read-only.
This is readily done if I just return the queryset list, using a builtin filter I created, get(). But it has to be in a form that has some added fields for users to fill.
{% for foo in foo_list %}
<h5>{{ foo.json|get:"title" }}</h5>
{% endfor %}
The problem is that doing the same for a formset field I get the error "'BoundField' object has no attribute 'get'"
{% for form in formset %}
<h5>{{ form.json|get:"title" }}</h5>
{% endfor %}
Here is the filter:
@register.filter(name='get')
def get(d, k):
print('get(d,k):',d,k)
return d.get(k, None)
The relevant bits of the view:
...
foo_list = Foo.objects.all()
...
FooFormset = modelformset_factory(
Foo, fields = ['task_id','authority','dataset','place_id',
'authrecord_id','json'], form=FooModelForm, extra=0)
formset = FooFormset(request.POST or None, queryset=foo_list)
context['formset'] = formset
...
return render(request, 'datasets/review.html', context=context)
django django-templates formset
asked Nov 20 '18 at 19:56
kgeokgeo
669
add a comment |
One of the fields returned to my template in a formset generated by modelformset_factory() is a JSONField. I'd like to parse the json and display elements in it separately within the form, read-only.
This is readily done if I just return the queryset list, using a builtin filter I created, get(). But it has to be in a form that has some added fields for users to fill.
{% for foo in foo_list %}
<h5>{{ foo.json|get:"title" }}</h5>
{% endfor %}
The problem is that doing the same for a formset field I get the error "'BoundField' object has no attribute 'get'"
{% for form in formset %}
<h5>{{ form.json|get:"title" }}</h5>
{% endfor %}
Here is the filter:
@register.filter(name='get')
def get(d, k):
print('get(d,k):',d,k)
return d.get(k, None)
The relevant bits of the view:
...
foo_list = Foo.objects.all()
...
FooFormset = modelformset_factory(
Foo, fields = ['task_id','authority','dataset','place_id',
'authrecord_id','json'], form=FooModelForm, extra=0)
formset = FooFormset(request.POST or None, queryset=foo_list)
context['formset'] = formset
...
return render(request, 'datasets/review.html', context=context)
django django-templates formset
asked Nov 20 '18 at 19:56
kgeokgeo
669
But this doesn't make sense.foois a form, andfoo.jsonis a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?
– Daniel Roseman
Nov 20 '18 at 22:41
I was not clear;foois in the first case an element infoo_listandfoo.jsonis a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks
– kgeo
Nov 20 '18 at 23:45
add a comment |
One of the fields returned to my template in a formset generated by modelformset_factory() is a JSONField. I'd like to parse the json and display elements in it separately within the form, read-only.
This is readily done if I just return the queryset list, using a builtin filter I created, get(). But it has to be in a form that has some added fields for users to fill.
{% for foo in foo_list %}
<h5>{{ foo.json|get:"title" }}</h5>
{% endfor %}
The problem is that doing the same for a formset field I get the error "'BoundField' object has no attribute 'get'"
{% for form in formset %}
<h5>{{ form.json|get:"title" }}</h5>
{% endfor %}
Here is the filter:
@register.filter(name='get')
def get(d, k):
print('get(d,k):',d,k)
return d.get(k, None)
The relevant bits of the view:
...
foo_list = Foo.objects.all()
...
FooFormset = modelformset_factory(
Foo, fields = ['task_id','authority','dataset','place_id',
'authrecord_id','json'], form=FooModelForm, extra=0)
formset = FooFormset(request.POST or None, queryset=foo_list)
context['formset'] = formset
...
return render(request, 'datasets/review.html', context=context)
django django-templates formset
asked Nov 20 '18 at 19:56
kgeokgeo
669
One of the fields returned to my template in a formset generated by modelformset_factory() is a JSONField. I'd like to parse the json and display elements in it separately within the form, read-only.
This is readily done if I just return the queryset list, using a builtin filter I created, get(). But it has to be in a form that has some added fields for users to fill.
{% for foo in foo_list %}
<h5>{{ foo.json|get:"title" }}</h5>
{% endfor %}
The problem is that doing the same for a formset field I get the error "'BoundField' object has no attribute 'get'"
{% for form in formset %}
<h5>{{ form.json|get:"title" }}</h5>
{% endfor %}
Here is the filter:
@register.filter(name='get')
def get(d, k):
print('get(d,k):',d,k)
return d.get(k, None)
The relevant bits of the view:
...
foo_list = Foo.objects.all()
...
FooFormset = modelformset_factory(
Foo, fields = ['task_id','authority','dataset','place_id',
'authrecord_id','json'], form=FooModelForm, extra=0)
formset = FooFormset(request.POST or None, queryset=foo_list)
context['formset'] = formset
...
return render(request, 'datasets/review.html', context=context)
django django-templates formset
django django-templates formset
asked Nov 20 '18 at 19:56
kgeokgeo
669
asked Nov 20 '18 at 19:56
kgeokgeo
669
asked Nov 20 '18 at 19:56
kgeokgeo
669
asked Nov 20 '18 at 19:56
kgeokgeo
669
asked Nov 20 '18 at 19:56
kgeokgeo
669
669
But this doesn't make sense.foois a form, andfoo.jsonis a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?
– Daniel Roseman
Nov 20 '18 at 22:41
I was not clear;foois in the first case an element infoo_listandfoo.jsonis a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks
– kgeo
Nov 20 '18 at 23:45
add a comment |
But this doesn't make sense.foois a form, andfoo.jsonis a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?
– Daniel Roseman
Nov 20 '18 at 22:41
I was not clear;foois in the first case an element infoo_listandfoo.jsonis a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks
– kgeo
Nov 20 '18 at 23:45
But this doesn't make sense.
foo is a form, and foo.json is a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?– Daniel Roseman
Nov 20 '18 at 22:41
But this doesn't make sense.
foo is a form, and foo.json is a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?– Daniel Roseman
Nov 20 '18 at 22:41
I was not clear;
foo is in the first case an element in foo_list and foo.json is a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks– kgeo
Nov 20 '18 at 23:45
I was not clear;
foo is in the first case an element in foo_list and foo.json is a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks– kgeo
Nov 20 '18 at 23:45
add a comment |
1 Answer
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I found that applying a custom filter to form.json.value did the trick. The new filter converts that (text) value to json, from which I can do a get for specific keys.
new get filter:
@register.filter(name='get')
def get(d, k):
jd = json.loads(d)
return jd.get(k, None)
and its implementation in a template:
{{ form.json.value|get:"names" }}
BoundField.value is text, even though json in the db, so it needs conversion back for parsing.
answered Nov 20 '18 at 23:51
kgeokgeo
669
add a comment |
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1 Answer
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I found that applying a custom filter to form.json.value did the trick. The new filter converts that (text) value to json, from which I can do a get for specific keys.
new get filter:
@register.filter(name='get')
def get(d, k):
jd = json.loads(d)
return jd.get(k, None)
and its implementation in a template:
{{ form.json.value|get:"names" }}
BoundField.value is text, even though json in the db, so it needs conversion back for parsing.
answered Nov 20 '18 at 23:51
kgeokgeo
669
add a comment |
I found that applying a custom filter to form.json.value did the trick. The new filter converts that (text) value to json, from which I can do a get for specific keys.
new get filter:
@register.filter(name='get')
def get(d, k):
jd = json.loads(d)
return jd.get(k, None)
and its implementation in a template:
{{ form.json.value|get:"names" }}
BoundField.value is text, even though json in the db, so it needs conversion back for parsing.
answered Nov 20 '18 at 23:51
kgeokgeo
669
add a comment |
I found that applying a custom filter to form.json.value did the trick. The new filter converts that (text) value to json, from which I can do a get for specific keys.
new get filter:
@register.filter(name='get')
def get(d, k):
jd = json.loads(d)
return jd.get(k, None)
and its implementation in a template:
{{ form.json.value|get:"names" }}
BoundField.value is text, even though json in the db, so it needs conversion back for parsing.
answered Nov 20 '18 at 23:51
kgeokgeo
669
I found that applying a custom filter to form.json.value did the trick. The new filter converts that (text) value to json, from which I can do a get for specific keys.
new get filter:
@register.filter(name='get')
def get(d, k):
jd = json.loads(d)
return jd.get(k, None)
and its implementation in a template:
{{ form.json.value|get:"names" }}
BoundField.value is text, even though json in the db, so it needs conversion back for parsing.
answered Nov 20 '18 at 23:51
kgeokgeo
669
answered Nov 20 '18 at 23:51
kgeokgeo
669
answered Nov 20 '18 at 23:51
kgeokgeo
669
answered Nov 20 '18 at 23:51
kgeokgeo
669
669
add a comment |
add a comment |
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But this doesn't make sense.
foois a form, andfoo.jsonis a field: it's a place for you to enter JSON in string format. It isn't actually JSON itself. What are you trying to achieve here?– Daniel Roseman
Nov 20 '18 at 22:41
I was not clear;
foois in the first case an element infoo_listandfoo.jsonis a json object. But that first bit doesn't involve forms. The problem is what follows - rendering the value of a BoundField in a template. I found the answer in an old patch thread - BoundField.value, described in my self-answer below. Thanks– kgeo
Nov 20 '18 at 23:45