{"id":37,"date":"2023-01-17T16:47:00","date_gmt":"2023-01-17T16:47:00","guid":{"rendered":"https:\/\/pythonpower.in\/index.php\/2023\/01\/17\/working-with-django-model-forms\/"},"modified":"2023-01-17T16:47:00","modified_gmt":"2023-01-17T16:47:00","slug":"working-with-django-model-forms","status":"publish","type":"post","link":"https:\/\/pythonpower.in\/index.php\/2023\/01\/17\/working-with-django-model-forms\/","title":{"rendered":"Working With Django Model Forms"},"content":{"rendered":"<\/p>\n
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Model Forms (Forms based on Model):
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1) Sometimes we can create form based on Model, such type of forms are called model
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   based forms or model forms.
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2) The main advantage of model forms is we can grab end user input and we can save
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   that input data very easily to the database.
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3) Django provides inbuilt support to develop model based forms very easily.
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How to develop Model based Forms:
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1) While develop FormClass instead of inheriting forms.Form class,we have to inherit
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   forms.ModelForm class.
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class RegisterForm(forms.ModelForm):
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….
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2) We have to write one nested class (Meta class) to specify Model information and
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   required fields.
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class RegisterForm(forms.ModelForm):
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# field declarations if we are performing any custom validations.If we are not defining
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any custom validations then here we are not required to specify any field.
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class <\/span>Meta<\/span><\/span>:
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# we have to specify Model class name and requied fields
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model=Student
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fields=’__all__’
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Case-1<\/span><\/span>: <\/span>Instead of all fields if we want only selected fields, then we have to specify as
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follows
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class <\/span>Meta<\/span><\/span>:
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model=Student
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fileds=(‘field1′,’field2′,’field3’)
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In the form only 3 fields will be considered.
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If Model class contains huge number of fields and we required to consider very less
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number of fields in the form then we should use this approach.
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Case-2:
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Instead of all fields if we want to exclude certain fields ,then we have to specify as follows
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class Meta:
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model=Student
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exclude=[‘field1′,’field2’]
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In the form all fields will be considered except field1 and field2.
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If the Model class contains huge number of fields and if we want to exclude very few fields
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then we have to use this approach.<\/span><\/p>\n


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Q) In Model based Forms, how many ways are there to
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specify Fields Information<\/span> <\/span><\/p>\n<\/p>\n

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Ans: 3 ways<\/span><\/p>\n

                 1) <\/span>All fields<\/span><\/p>\n

                 2) <\/span>Include certain fields<\/span><\/p>\n

                 3) <\/span>Exclude certain fields<\/span><\/p>\n

Note<\/span><\/span>: <\/span>The most commonly used approach is to include all fields.<\/span> <\/span><\/p>\n<\/p>\n

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How to Save User’s Input Data to Database in Model based Forms:
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We have to use save() method.<\/span><\/p>\n

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def student_view(request):
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…
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       <\/span>if request.method==’POST’:
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              form=RegisterForm(request.POST)
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              if form.is_valid():
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                  form.save(commit=True)
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..<\/span> <\/span><\/p>\n


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Demo project-1 (modelformproject):<\/span><\/p>\n

models.py:<\/span><\/span><\/p>\n

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          1) <\/span>from <\/span>django .db <\/span>import <\/span>models
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         2)
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         3)<\/span>#Createyourmodelshere.
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        4) <\/span>class <\/span>Student(models.Model):
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        5) <\/span>name=models.CharField(max_length=30)
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        6) <\/span>marks=models.IntegerField()
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forms.py: <\/span><\/span><\/p>\n

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         1) <\/span>from <\/span>django <\/span>import <\/span>forms
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         2) <\/span>from <\/span>testapp .models <\/span>import <\/span>Student
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         3) <\/span>class <\/span>StudentForm(forms.ModelForm):
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        4) <\/span>#fields with validations
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        5) <\/span>class <\/span>Meta:
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        6) <\/span>model=Student
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       7) <\/span>fields=<\/span>‘__all__’
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views.py: <\/span><\/span><\/p>\n

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       1) <\/span>from <\/span>django .shortcuts <\/span>import <\/span>render
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      2) <\/span>from <\/span>.<\/span>import <\/span>forms
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      3)
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      4) <\/span>#Create your views here.
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     5) <\/span>def <\/span>student_view(request):
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     6)         <\/span>form=forms.StudentForm
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    7)          <\/span>if <\/span>request.method==<\/span>‘POST’<\/span>:
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    8)              <\/span>form=forms.StudentForm(request.POST)
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    9)               <\/span>if <\/span>form.is_valid():
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   10)             <\/span>form.save(commit=True)
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   11)         <\/span>return <\/span>render(request,<\/span>‘testapp\/studentform.html’<\/span>,{<\/span>‘form’<\/span>:form})
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<\/div>\n
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How to Add Date Widget:
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write a DateInput class in forms.py as:
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class DateInput(forms.DateInput):
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input_type = ‘date’
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class MoviesForm(forms.ModelForm):
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movie_name =forms.CharField(widget=forms.TextInput(attrs={‘class’:’form-control’}))
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release_date =forms.DateField(widget=DateInput(attrs={‘class’:’form-control’}))
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hero_name =forms.CharField(widget=forms.TextInput(attrs={‘class’:’form-control’}))
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heroine_name =forms.CharField(widget=forms.TextInput(attrs={‘class’:’form-control’}))
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director_name =forms.CharField(widget=forms.TextInput(attrs={‘class’:’form-control’}))
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movie_ratings =forms.FloatField(widget=forms.TextInput(attrs={‘class’:’form-control’}))
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class Meta:
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model=MoviesModel
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fields=[‘movie_name’,’release_date’,’hero_name’,’heroine_name’,’director_name’,’movie
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_ratings’]
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<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

  Model Forms (Forms based on Model): 1) Sometimes we can create form based on…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_joinchat":[]},"categories":[7],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/posts\/37"}],"collection":[{"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/comments?post=37"}],"version-history":[{"count":0,"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/posts\/37\/revisions"}],"wp:attachment":[{"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/media?parent=37"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/categories?post=37"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pythonpower.in\/index.php\/wp-json\/wp\/v2\/tags?post=37"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}