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POMore Pythonic way to repeat some actions for a number of attributes
 

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  1. POMore Pythonic way to repeat some actions for a number of attributes
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    <p>I have a Django app that allows the user to create variables and name them</p> <pre><code>class Product(models.Model): name = models.CharField(max_length=40, unique=True) int1_name = models.CharField(max_length=60, blank=True, null=True) int1_default = models.IntegerField(blank=True, null=True) int2_name = models.CharField(max_length=60, blank=True, null=True) int2_default = models.IntegerField(blank=True, null=True) float1_name = models.CharField(max_length=60, blank=True, null=True) float1_default = models.FloatField(blank=True, null=True) float2_name = models.CharField(max_length=60, blank=True, null=True) float2_default = models.FloatField(blank=True, null=True) string1_name = models.CharField(max_length=60, blank=True, null=True) string1_default = models.CharField(max_length=60, blank=True, null=True) string2_name = models.CharField(max_length=60, blank=True, null=True) string2_default = models.CharField(max_length=60, blank=True, null=True) </code></pre> <p>And then they are stored</p> <pre><code>class ItemData(models.Model): created = models.DateTimeField(default=datetime.now) item = models.ForeignKey(Item, editable=False) int1_val = models.IntegerField(blank=True, null=True) int2_val = models.IntegerField(blank=True, null=True) float1_val = models.DecimalField(blank=True, null=True, max_digits=12, decimal_places=2) float2_val = models.DecimalField(blank=True, null=True, max_digits=12, decimal_places=2) string1_val = models.CharField(max_length=60, blank=True, null=True) string2_val = models.CharField(max_length=60, blank=True, null=True) </code></pre> <p>And at the moment when I present the user with a form (that they have created) to fill in I do the following to lable up the fields with the names that user has given there variables</p> <pre><code>class ItemDataForm(ModelForm): # Only renames the fields based on whether the product has a name for the field def __init__(self,product,*args,**kwargs): super(ItemDataForm, self).__init__(*args, **kwargs) # delete all the fields that will be automatically filled in when saving del self.fields['created'] # if the values is set in the product if product.int1_name: self.fields['int1_val'].label = product.int1_name self.fields['int1_val'].value = product.int1_default else: del self.fields['int1_val'] if product.int2_name: self.fields['int2_val'].label = product.int2_name self.fields['int2_val'].value = product.int2_default else: del self.fields['int2_val'] if product.float1_name: self.fields['float1_val'].label = product.float1_name self.fields['float1_val'].value = product.float1_default else: del self.fields['float1_val'] if product.float2_name: self.fields['float2_val'].label = product.float2_name self.fields['float2_val'].value = product.float2_default else: del self.fields['float2_val'] if product.string1_name: self.fields['string1_val'].label = product.string1_name self.fields['string1_val'].value = product.string1_default else: del self.fields['string1_val'] if product.string2_name: self.fields['string2_val'].label = product.string2_name self.fields['string2_val'].value = product.string2_default else: del self.fields['string2_val'] </code></pre> <p>Is there any way I could do this a bit more pythonicaly like have a list is <code>settings.py</code> and loop over it:</p> <pre><code>USER_SETTABLE_VARIABLES = ['int1','int2','float1','float2','string1','string2'] </code></pre> <p>The same applies to the way I make sure that the data entered is unique before saving:</p> <pre><code>def is_unique(self,latestSI): if (self.cleaned_data['int1_val'] == latestSI.int1_val and self.cleaned_data['int2_val'] == latestSI.int2_val and self.cleaned_data['float1_val'] == latestSI.float1_val and self.cleaned_data['float2_val'] == latestSI.float2_val and self.cleaned_data['string1_val'] == latestSI.string1_val and self.cleaned_data['string2_val'] == latestSI.string2_val): return False else: return True </code></pre> <p>I only ask because when I want to add to the model I don't want to be editing all these functions.</p>
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