I am a beginner and trying to create CRUD Django Application where I want to keep the below fields.
Company Name
DOB
Date and time
State (should be dependency between State and City)
City (should be dependency between State and City)
Please help me for complete code
For example i give input as:
company name : ABC
DOB Date and time : 2022-01-01 08:12:00
State : Karnataka(if I select State "Karnataka" then related city of Karnataka has to be showed in dropdown)
City : Bangalore, Mysore
if I click on edit button entire field's value has to be show
form design has to horizontal (for Example)
company name DOB , Date and time
State , City
Not like this (for Example)
company name DOB
Date and time
State
City
I created CRUD mini project with Dependent Dropdown
Repo link here
Browser Output
Related
I am working in Dynamo DB for the first time . My assignment is Ticket Management System where it has 3 entities Department , User and Ticket. The relationship between each entity is.
I have identified the following access patterns
Fetch a Department.
Fetch all users in Department
Fetch a given user in Department
Fetch all Tickets belongs to the Department
Fetch all Tickets assigned to the User
for which i defined the following data model . I am thinking of creating GSI with Tickets as PK and User as SK to do 4 & 5
On a higher level I need to perform 2 updates . I can update the User to which the ticket is assigned and I can update the ticket status as inprogress, resolved . And in the table I have Ticket details as JSON object as below.
I need help from from the experienced people whether my understanding and approach is efficient.
I think you're on the right track. I'd design it as a table with two Global Secondary indexes. The base table looks like this:
The first Global Secondary Index like this (GSI1):
The second Global Secondary Index like this (GSI2):
Now for the why:
This design allows you to easily update the following things:
A user's department
A ticket's status if you know the ticket Id
A ticket's user if you know the ticket Id
A ticket's department if you know the ticket Id
You can get a bunch of information from this model:
Fetch a Department.
Query the base table with the department name or list all departments
Fetch all users in Department
Query GSI 1 with the Department Name and filter the sort Key using begins_with = USER#
Fetch a given user in Department
Sound like you know the UserId, so do a GetItem on the base table. If that's not the case, do the query mentioned in "Fetch all users in Department".
Fetch all Tickets belongs to the Department
Query GSI 1 with the department name as the PK and filter the SK using begins_with = Ticket#
Fetch all Tickets assigned to the User
Query GSI 2 with the user id as the PK and filter the SK using begins_with = Ticket#
good day guys,
I need your opinion on this problem. although am using Django for my project but am sure this problem is not tie to django alone. So, I am working on these services booking system. In my database I have 3 tables listed below:
User_Table with field
• Id
• Username
• Fullname
Services_Table with field
• Id
• name
• Price
Transaction_Table with field
• Id
• User_id
• Services_id (many to many relationship)
When this services get booked, I send it to the transaction table using the user_id and services_id as foreign key for User Table and Services Table meaning it’s the id values that are saved.
When a client want to view his or her transaction history, I provide it by running the query:
price = transaction.service.price
service_name = transaction.service.name
total_cost = sum of all services selected
as not to present the user with id values for price and service_name.
now here is my problem, in future, if the admin decide to change the name and price of a service and the client goes back to view his old transaction log, the new value get populated cus I referenced them by ids which is not what I want, I want the client to see the old value as a receipt would be even when I updated the services table.
What do you suggest I do in this case?
You should record every transaction made and record the price and amount it totalled up to at the moment the txn was made. Transaction model should have fields to record every detail about the transaction.
This means:
You would have a txn_service table, where all services in a transaction are saved and linked to the transaction table.
I'm trying to create a mileage reimbursement log in sharepoint13 but can't use infopath because I was told by my super that it would require licenses for all users. So the form I wanted to create is formatted something like this:
Emp Name_______________
Date____________________
Ceneter Num_____________
======================================================================================
From Dest______________ To Dest____________________ Mile___________________________
click to add row
Total miles_______________________
======================================================================================
trip purpose___________________________________________________________________________
comments________________________________________________________________________________
SUBMIT
I'm having a problem with the center section, id like the from dest, to dest, mile to repeat by clicking the add row link but I can't find much info out there to do this other than using using info path. After I create this I need to set up a workflow to email the director for approval and then once approved send email to finance dept to process form
I have an application that allows for "contacts" to be made completely customized. My method of doing that is letting the administrator setup all of the fields allowed for the contact. My database is as follows:
Contacts
id
active
lastactive
created_on
Fields
id
label
FieldValues
id
fieldid
contactid
response
So the contact table only tells whether they are active and their identifier; the fields tables only holds the label of the field and identifier, and the fieldvalues table is what actually holds the data for contacts (name, address, etc.)
So this setup has worked just fine for me up until now. The client would like to be able to pull a cumulative report, but say state of all the contacts in a certain city. Effectively the data would have to look like the following
California (from fields table)
Costa Mesa - (from fields table) 5 - (counted in fieldvalues table)
Newport 2
Connecticut
Wallingford 2
Clinton 2
Berlin 5
The state field might be id 6 and the city field might be id 4. I don't know if I have just been looking at this code way to long to figure it out or what,
The SQL to create those three tables can be found at https://s3.amazonaws.com/davejlong/Contact.sql
You've got an Entity Attribute Value (EAV) model. Use the field and fieldvalue tables for searching only - the WHERE caluse. Then make life easier by keeping the full entity's data in a CLOB off the main table (e.g. Contacts.data) in a serialized format (WDDX is good for this). Read the data column out, deserialize, and work with on the server side. This is much easier than the myriad of joins you'd need to do otherwise to reproduce the fully hydrated entity from an EAV setup.
I have a models in Django that are something like this:
class Classification(models.Model):
name = models.CharField(choices=class_choices)
...
class Activity(models.Model):
name = models.CharField(max_length=300)
fee = models.ManyToManyField(Classification, through='Fee')
...
class Fee(models.Model):
activity = models.ForeignKey(Activity)
class = models.ForeignKey(Classification)
early_fee = models.IntegerField(decimal_places=2, max_digits=10)
regular_fee = models.IntegerField(decimal_places=2, max_digits=10)
The idea being that there will be a set of fees associated with each Activity and Classification pair. Classification is like Student, Staff, etc.
I know that part works right.
Then in my application, I query for a set of Activities with:
activities = Activity.objects.filter(...)
Which returns a list of activities. I need to display in my template that list of Activities with their Fees. Something like this:
Activity Name
Student Early Price - $4
Student Regular Price - $5
Staff Early Price - $6
Staff Regular Price - $8
But I don't know of an easy way to get this info without a specific get query of the Fees object for each activity/class pair.
I hoped this would work:
activity.fee.all()
But that just returns the Classification Object. Is there a way to get the Fee Object Data for the Pair via the Activities I already queried?
Or am I doing this completely wrong?
Considering michuk's tip to rename "fee" to "classification":
Default name for Fee objects on Activity model will be fee_set. So in order to get your prices, do this:
for a in Activity.objects.all():
a.fee_set.all() #gets you all fees for activity
There's one thing though, as you can see you'll end up doing 1 SELECT on each activity object for fees, there are some apps that can help with that, for example, django-batch-select does only 2 queries in this case.
First of all I think you named your field wrong. This:
fee = models.ManyToManyField(Classification, through='Fee')
should be rather that:
classifications = models.ManyToManyField(Classification, through='Fee')
as ManyToManyField refers to a list of related objects.
In general ManyToManyField, AFAIK, is only a django shortcut to enable easy fetching of all related objects (Classification in your case), with the association table being transparent to the model. What you want is the association table (Fee in your case) not being transparent.
So what I would do is to remove the ManyToManyField field from Activity and simply get all the fees related with the activity. And thenm if you need a Classification for each fee, get the Classification separately.