Programmatically saving image to Django ImageField

Question

Ok  I ve tried about near everything and I cannot get this to work    I have a Django model with an ImageField on it I have code that downloads an image via HTTP  tested and works  The image is saved directly into the  upload to  folder  the upload to being the one that is set on the ImageField  All I need to do is associate the already existing image file path with the ImageField   I ve written this code about 6 different ways   The problem I m running into is all of the code that I m writing results in the following behavior   1  Django will make a 2nd file   2  rename the new file  adding an   to the end of the file name  then  3  not transfer any of the data over leaving it basically an empty re-named file   What s left in the  upload to  path is 2 files  one that is the actual image  and one that is the name of the image but is empty  and of course the ImageField path is set to the empty file that Django try to create   In case that was unclear  I ll try to illustrate      Image generation code runs       Upload      generated image jpg     4kb     Attempt to set the ImageField path     Upload      generated image jpg     4kb      generated image  jpg    0kb  ImageField Path    Upload generated image  jpg   How can I do this without having Django try to re-store the file   What I d really like is something to this effect     model ImageField path   generated image path      but of course that doesn t work   And yes I ve gone through the other questions here like this one as well as the django doc on File  UPDATE After further testing  it only does this behavior when running under Apache on Windows Server   While running under the  runserver  on XP it does not execute this behavior    I am stumped   Here is the code which runs successfully on XP     f   open thumb path   r   model thumbnail   File f  model save

User · Answer

If you want to just  set  the actual filename  without incurring the overhead of loading and re-saving the file       or resorting to using a charfield        you might want to try something like this --  model instance myfile   model instance myfile field attr class model instance  model instance myfile field   my-filename jpg     This will light up your model instance myfile url and all the rest of them just as if you d actually uploaded the file   Like  t-stone says  what we really want  is to be able to set instance myfile path    my-filename jpg   but Django doesn t currently support that

User · Answer

Super easy if model hasn t been created yet   First  copy your image file to the upload path  assumed    path   in following snippet    Second  use something like   class Layout models Model       image   models ImageField  img   upload to  path     layout   Layout   layout image    path image png  layout save     tested and working in django 1 4  it might work also for an existing model

User · Answer

Here is a method that works well and allows you to convert the file to a certain format as well  to avoid  cannot write mode P as JPEG  error     import urllib2 from django core files base import ContentFile from PIL import Image from StringIO import StringIO  def download image name  image  url       input file   StringIO urllib2 urlopen url  read        output file   StringIO       img   Image open input file      if img mode     RGB           img   img convert  RGB       img save output file   JPEG       image save name   jpg   ContentFile output file getvalue     save False    where image is the django ImageField or your model instance image  here is a usage example   p   ProfilePhoto user user  download image str user id   p image  image url  p save     Hope this helps

User · Answer

Ok  If all you need to do is associate the already existing image file path with the ImageField  then this solution may be helpfull   from django core files base import ContentFile  with open   path to already existing file   as f    data   f read      obj image is the ImageField obj image save  imgfilename jpg   ContentFile data     Well  if be earnest  the already existing image file will not be associated with the ImageField  but the copy of this file will be created in upload to dir as  imgfilename jpg  and will be associated with the ImageField

User · Answer

I have some code that fetches an image off the web and stores it in a model   The important bits are   from django core files import File    you need this somewhere import urllib     The following actually resides in a method of my model  result   urllib urlretrieve image url    image url is a URL to an image    self photo is the ImageField self photo save      os path basename self url       File open result 0    rb           self save     That s a bit confusing because it s pulled out of my model and a bit out of context  but the important parts are    The image pulled from the web is not stored in the upload to folder  it is instead stored as a tempfile by urllib urlretrieve   and later discarded  The ImageField save   method takes a filename  the os path basename bit  and a django core files File object    Let me know if you have questions or need clarification   Edit  for the sake of clarity  here is the model  minus any required import statements    class CachedImage models Model       url   models CharField max length 255  unique True      photo   models ImageField upload to photo path  blank True       def cache self              Store image locally if we have a URL             if self url and not self photo              result   urllib urlretrieve self url              self photo save                      os path basename self url                       File open result 0    rb                                      self save

User · Answer

class Pin models Model          Pin Class        image link   models CharField max length 255  null True  blank True      image   models ImageField upload to  images    blank True      title   models CharField max length 255  null True  blank True      source name   models CharField max length 255  null True  blank True      source link   models CharField max length 255  null True  blank True      description   models TextField null True  blank True      tags   models ForeignKey Tag  blank True  null True       def   unicode   self              Unicode class             return unicode self image link       def save self   args    kwargs              Store image locally if we have a URL            if self image link and not self image              result   urllib urlretrieve self image link              self image save os path basename self image link   File open result 0    r                 self save               super Pin  self  save

User · Answer

You can try   model ImageField path   os path join   Upload   generated image path

User · Answer

So  if you have a model with an imagefield with an upload to attribute set  such as  class Avatar models Model       image file   models ImageField upload to user directory path avatar   then it is reasonably easy to change the image  at least in django 3 15  In the view  when you process the image  you can obtain the image from  self request FILES  avatar    which is an instance of type InMemoryUploadedFile  as long as your html form has the enctype set and a field for avatar         lt form method  quot post quot  class  quot avatarform quot  id  quot avatarform quot  action  quot    url avatar update view     quot  enctype  quot multipart form-data quot  gt              csrf token              lt input id  quot avatarUpload quot  class  quot d-none quot  type  quot file quot  name  quot avatar quot  gt       lt  form gt   Then  setting the new image in the view is as easy as the following  where profile is the profile model for the self request user  profile avatar image file save self request FILES  avatar   name  self request FILES  avatar     There is no need to save the profile avatar  the image field already saves  and into the correct location because of the  upload to  callback function

User · Answer

What I did was to create my own storage that will just not save the file to the disk   from django core files storage import FileSystemStorage  class CustomStorage FileSystemStorage        def  open self  name  mode  rb            return File open self path name   mode        def  save self  name  content             here  you should implement how the file is to be saved           like on other machines or something  and return the name of the file            In our case  we just return the name  and disable any kind of save         return name      def get available name self  name           return name   Then  in my models  for my ImageField  I ve used the new custom storage   from custom storage import CustomStorage  custom store   CustomStorage    class Image models Model       thumb   models ImageField storage custom store  upload to   some path

User · Answer

Another possible way to do that  from django core files import File  with open  path to file    r   as f      use  rb  mode for python3     data   File f      model image save  filename   data  True

User · Answer

A lot of these answers were outdated  and I spent many hours in frustration  I m fairly new to Django  amp  web dev in general   However  I found this excellent gist by  iambibhas  https   gist github com iambibhas 5051911  import requests  from django core files import File from django core files temp import NamedTemporaryFile   def save image from url model  url       r   requests get url       img temp   NamedTemporaryFile delete True      img temp write r content      img temp flush        model image save  image jpg   File img temp   save True

User · Answer

This is might not be the answer you are looking for  but you can use charfield to store the path of the file instead of ImageFile  In that way you can programmatically associate uploaded image to field without recreating the file

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class tweet photos models Model   upload path  absolute path  image models ImageField upload to upload path  image url   models URLField null True  blank True  def save self   args    kwargs       if self image url          import urllib  os         from urlparse import urlparse         file save dir   self upload path         filename   urlparse self image url  path split      -1          urllib urlretrieve self image url  os path join file save dir  filename           self image   os path join file save dir  filename          self image url          super tweet photos  self  save

User · Answer

With Django 3   with a model such as this one   class Item models Model      name   models CharField max length 255  unique True     photo  models ImageField upload to  image folder    blank True    if the image has already been uploaded  we can directly do    Item objects filter      update photo  image folder sample photo png     or   my item   Item objects get id 5  my item photo  image folder sample photo png  my item save

User · Answer

Your can use Django REST framework and python Requests library to Programmatically saving image to Django ImageField  Here is a Example   import requests   def upload image          PATH TO DJANGO REST API     url    http   127 0 0 1 8080 api gallery          MODEL FIELDS DATA     data     first name    Rajiv    last name    Sharma           UPLOAD FILES THROUGH REST API     photo   open   path to photo     rb       resume   open   path to resume     rb       files     photo   photo   resume   resume       request   requests post url  data data  files files      print request status code  request reason

User · Answer

Working  You can save image by using FileSystemStorage  check the example below  def upload pic request   if request method     POST  and request FILES  photo        photo   request FILES  photo       name   request FILES  photo   name     fs   FileSystemStorage         you can update file saving location too by adding line below           fs base location   fs base location   company coverphotos                         filename   fs save name  photo      uploaded file url   fs url filename    company coverphotos      Profile objects filter user request user  update photo photo

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class DemoImage models Model       title   models TextField max length 255  blank False      image   models ImageField blank False  upload to  quot images DemoImages  quot    import requests import urllib request from django core files import File url    quot https   path to logo jpg quot     Below 3 lines is to fake as browser agent    as many sites block urllib class suspecting to be bots opener   urllib request build opener   opener addheaders      quot User-agent quot    quot Mozilla 5 0 quot    urllib request install opener opener     Issue command to actually download and create temp img file in memory         result   urllib request urlretrieve url     DemoImage objects create title  quot title quot   image File open result 0    quot rb quot           This erroneously results in creating the file like    images DemoImages path to temp dir logo image file    as opposed to    images DemoImages logo image file    Solution to get the file in images DemoImages  reopen   open result 0    quot rb quot     Returns a BufferedReader object of the temp image django file   File reopen        Create the file from the BufferedReader object  demoimg   DemoImage   demoimg title    quot title quot  demoimg image save  quot logo png quot   django file  save True   This approach also triggers file upload to cloudinary S3 if so configured

User · Answer

Just a little remark  tvon answer works but  if you re working on windows  you probably want to open   the file with  rb   Like this   class CachedImage models Model       url   models CharField max length 255  unique True      photo   models ImageField upload to photo path  blank True       def cache self              Store image locally if we have a URL             if self url and not self photo              result   urllib urlretrieve self url              self photo save                      os path basename self url                       File open result 0    rb                                      self save     or you ll get your file truncated at the first 0x1A byte

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