Very generous. Thank you. It looks as though you did get the model
structure. Your first comment nails it because mixtures can have other
mixtures as ingredients. I'm right into recursion nowadays :)
Mike
On 22/12/2016 7:48 PM, C. Kirby wrote:
Ill be honest, I'm still not getting how your models are structured.
That is ok though, I can give you some pointers and hopefully that
will be sufficient. I'll also be very explicit in describing the
steps. Several are probably better as single orm calls. _meta docs at
https://docs.djangoproject.com/en/1.10/ref/models/meta/
Hope this helps. If you have any clarifying questions I am happy to
chime in more.
|
fromdjango.db.models importTextField
#First get all ingredients you are interested in (I am assuming that
#mixtures are only one level deep, if not then build a recursive call)
ingredients =Substance_Ingredients.objects.filter(substance=<parent
substance>).values_list('ingredient.pk',flat=True)
#Get the substance instances for these
child_substances =Substance.objects.filter(pk__in =ingredients)
target_text =''
forcs inchild_substance:
#Get all OneToOne and OneToMany fields
models =[
(f,f.model iff.model !=(SubstanceorSubstanceIngredient)elseNone)
forf inSubstance._meta.get_fields()
if(f.one_to_many orf.one_to_one)
andnotf.auto_created andnotf.concrete
]
ingredient_text =''
forfield,model inmodels:
#Check the model for TextFields
tfs =[f forf inmodel._met.get_fields()ifisinstance(f,TextField)]
#get the textfield attributes for your substance field
field_text =[getattr(field,tf,'')fortf intfs]
#compile you text strings at the necessary levels
ingredient_text ='{},
{}'.format(ingredient_text,'.'.join(field_text))
child_text ='{}: {}'.format(cs.substance_name,ingredient_text)
target_text ='{}\n{}'.formate(target_text,child_text)
#Save you target text to the original substance
|
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