Add extra fields to a ModelAdmin form

[James Foley]

So, I have a ModelAdmin that I need to add extra fields to. These fields do not exist on the model, but will be dynamically added to a custom ModelForm through the __init__ method, and logic inside clean will handle the returned data on save.

I can't seem to find any solid information related to adding custom non-model fields to a ModelAdmin form. The closest I have come is by overriding get_fields on the ModelAdmin class and updating self.form.declared_fields with the new fields I'd like to add. 

This just doesn't feel very clean to me and I was curious if there was a better way to add new fields to a ModelAdmin dynamically?

[Mark Phillips]

James,

Did you ever get a response to this issue? I am having a devil of a time adding some extra non-model fields to an admin inline form. My added complication is that the fields are only defined at run time, so I have to have a loop that creates them based on a different model in my app. 

Would you be willing to share your code with me? In particular, I am not sure where and how you are using self.form.declared_fields. 

I am running django 1.11.

Thanks!

Mark

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[James Foley]

Hey Mark,

I've not actually found a solution yet, I've just sort of put it at the bottom of my pile of problems...

Here is the post that I used to get where I am https://stackoverflow.com/a/35797311/3173119

It just doesn't feel very Django like, and I feel that there must be an easier way to simply add a non-model field to a model admin form. My fields are also added at run time which is whats causing me issues.

My actual goal is to convert a flat JSON string stored in a JSON field, into fields for each key. Then once saved it coverts them all back into a JSON string and stored them back on the one JSON field.

James.

On Wednesday, 2 May 2018 16:02:51 UTC+1, mark wrote:

James,

Did you ever get a response to this issue? I am having a devil of a time adding some extra non-model fields to an admin inline form. My added complication is that the fields are only defined at run time, so I have to have a loop that creates them based on a different model in my app. 

Would you be willing to share your code with me? In particular, I am not sure where and how you are using self.form.declared_fields. 

I am running django 1.11.

Thanks!

Mark

On Mon, Apr 30, 2018 at 1:41 AM, 'James Foley' via Django users <django...@googlegroups.com> wrote:

So, I have a ModelAdmin that I need to add extra fields to. These fields do not exist on the model, but will be dynamically added to a custom ModelForm through the __init__ method, and logic inside clean will handle the returned data on save.

I can't seem to find any solid information related to adding custom non-model fields to a ModelAdmin form. The closest I have come is by overriding get_fields on the ModelAdmin class and updating self.form.declared_fields with the new fields I'd like to add. 

This just doesn't feel very clean to me and I was curious if there was a better way to add new fields to a ModelAdmin dynamically?

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[Mark Phillips]

James,

I was finally able to add extra fields to a ModelForm dynamically! Check out the answer to this post - https://stackoverflow.com/questions/32335349/how-do-i-create-and-save-dynamic-fields-in-django-modeladmin

It worked for me in django 2. I have not tried it in django 1.11. 

I hope this help!

Mark

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