Hello all!
I have a question about where should the seats be assigned to keep track if it's booked for a showtime.
There is currently two way i thought of.
1) Assign the seats to the showtime instead of cinema. However this means that for each showtime it may have a different number of seats( which should not be true).
2) Check if the seat is assigned by accessing moviergoer->booking-> movieticket->seat number.
This method is tedious and uses more processing time. But i feel it's the right way as it will mean that the seats will be fixed.
I'm sorry if any other part of my diagram is wrongly drawn. However please guide me through this main question! I will be glad to get feedback for other part of my diagram too.
I really hope to learn more from this scenario.
Your design seems ok so far. Just a few observations:
you should remove the navigation in general since it does not add much value
the association from Booking to ShowTime seems superfluous as the Ticket already holds the needed information
re-think about duplicating cinema/movie:string in ShowTime as it adds unwanted redundancy
why do you have a <<use>> iso. an association in Review?
A seat is related to the cinema and the cinema offers show times. So 1) is ok.
Edit: You would map the ticket like this:
The both ID roles would map the ids in ShowTime and Seat. I would use an artificial integer for the seatID and likely some HHMM format for the showTimeID.
Related
I am dealing with CoreData, for training, I decided to create a small application for recording user income and expenses. CoreData tutorials all contain To-Do-List examples, and I haven't found any good examples that would help me.
// MARK: - Grammar
// I want to apologize for grammatical errors in the text. Unfortunately,
// English is not my native language, so in some places I used a translator.
If something is not clear, I will definitely try to explain it again.
When I began to think over how I would implement the application, I assumed that the most convenient way would be to save all user operations and make calculations in the application in the right places. So far, abstract, since It seems to me that this has little to do with the question, if you need to be more precise, I can provide a complete idea.
So, I'm going to save the user model, which will have the following data:
User operations (Operation type) - all operations will be saved, each operation includes the category for which the operation was performed, as well as the amount in currency.
User-selected categories (Category Type) - Categories that will be used for expenses or income when adding an operation.
Wallets (Type Wallet) - User's wallets, Everything is simple, the name, and the balance on it.
Budget Units (BudgetUnit Type) - These are user budgets, contains a category, and a budget for it. For example: Products - 10.000 $
When I started building dependencies in CoreData, I got a little strange behavior.
That is, the user has a relationship on the same category model as the Budget Unit and Operation. Something tells me that it won't work that way.
I want the user categories to be independent, he selected them, and I'm going to display them on the main screen, and each operation will have its own category model
In the picture above, the category model is used 3 times, the same model.
This is roughly how I represent the data structure that I would like to see. Different models have their own category model, independently of the others.
I think it could be implemented using 3 different models with the same values, but it seems to me that this approach is considered wrong.
So how do you properly implement the data model so that everything works as expected? I would be grateful for any help!
--- EDIT ---
As a solution to the problem, I can create multiple entities as Category (Example bellow)
But I don't know if this is good practice
I looked into several other open source projects and saw a solution to the problem.
I hope this helps someone in the future.
There is no need to save the categories for the user, you can simply save the categories in the application by adding the IsSelected and ID parameter to them in order to change these parameters when you select a category, and immediately understand which ones you need to display.
For budgets and operations (transactions) , we only need to save the category ID to immediately display the correct one.
For example:
Thanks #JoakimDanielson and #Moose for helping. It gave me a different view of the subject.
I've been looking for a solution for kindergarten teachers to submit daily student evaluations (different criteria) in Moodle. So far, the closest solution that I've found is the Attendance plugin.
Does anyone know of a plugin that allows the teacher to submit a daily evaluation?
Another option that I'm looking into is Moodle Competency, which can actually fit the need, however, it looks like competency is not cumulative ... if I can find a way to make it cumulative that will be awesome.
For example, one of the competencies we have is "able to read sentences" and the scale is "1 - non-developed", "2- being developed" and "3- fully developed". At any point, the teacher or school admin would like to know how competent the student is. In our case, if this is an indicator that is being responded daily, we should be able to take the average and be able to evaluate the student.
The competency framework (to my understanding) doesn't calculate the average, rather it relies on being rated by the teacher.
Any thoughts where I should continue to look?
Attendance could be a great solution to your needs.
It could be hidden to the ones acting like students (I'm not shure if the kindergarden kids be interested in see this, maybe their parents)
Attendance have a full compatibility with course grading.
It could be configured to have diferent percentaje of final grading, so far, you can use one attendance activity for have a registry for their personal clairliness, another to record assessment in math, one more to social assessment and so on.
Finally all users with minimun acces as teacher (or another role you defined: example: school administration, scholar control) Could have facilities to export every grading to spreadsheet.
I've several years using it in a similar way you are asking to.
I hope this helps you.
At my company we are currently using optaplanner to solve a vehicle routing problem with great results, we built a web app to manage vehicles, clientes, locations, depots and to show a graphic representation of the solution (including showing the locations in a map). We wrapped the solver in a spring java app with a rest interface to receive request and solve the problem. We are using Google maps to get distance-time data. Now we need to implement multirip....
To tackle the multitrip part I am following this approach:
1.- I added readyTime, endOfTrip and dueTime members to Vehicle class
2.- I created a rule to prevent arrivals at customers after vehicle->dueTime
3.- I modified the ArrivalTimeUpdateListener to consider the vehicle->readyTime when calculating the departureTime from a vehicle (using Math.max(depot->readyTime, vehicle->readyTime)
4.- At this point I started using the vehicle class as if it were a vehicle trip instead of a vehicle (I still don´t change the name but that is the idea )
5.- I created a member nextVehicle in vehicle to represent the next trip
6.- For testing purposes I manually link two vehicles (or vehicle trips) before sending it to solver->solve
7.- In the ArrivalTimeUpdatingVariableListener class I extended the method that updates the arrival times to consider updating the nextVehicle->readyTime and by consequence the arrival times of the customers that belong to the next trip (and so on when there are more than two trips)
I am sure this is not the most elegant solution, but I tried other approaches (using custom shadow variable on Vehicle for instance) but it couldn´t make it work.
The problem I am facing right now is that I don´t get to understand the state of the model when ArrivalTimeUpdatingVariableListener is called, maybe someone faced similar problem and can help me. What i found (after try and error) is:
the customer.getVehice() method not always returns a value (distinct from null value), it seems to get updated some time after the previousStandstill change triggers the listener "updateArrivalTime" method.
In construction fase when a customer get assign to a vehicle the customer.getVehice() method returns null (it came from "not assigned")
In construction fase when a customer "is freed" the customer.getVehice() method returns the "previous vehicle"
In local search fase when a customer get assign to a vehicle the customer.getVehice() method returns the "previous vehicle" (original vehicle)
In local search fase when a customer go back to the original vehicle the customer.getVehice() method returns the "previous assign vehicle"
Any thoughts on this? Am I making right assumptions? (because originally I considered customer.getVehicle() as the "actual" vehicle and the solutions were completely wrong...)
The order of triggering the previousStandstill change it´s kind of difficult to understand (for me). I mean when moving customers or swapping them between vehicles...any thoughts or hints on were to find info?
Can I access some variables from the "previous state of the model" when the solver makes a move?, because I am thinking I will need that if I continue with this approach (to update the vehicle->endOfTrip that is the nextVehicle->readyTime when the customer is the last one on the chain for instance)
and finally...am i doing something completely wrong conceptually ?
Any comments will be greatly appreciated (and sorry my grammar, I am native spanish speaker)
The chaotic triggering of shadow vars that you describe should not happen any more in optaplanner 6.3.0.Final or higher because it now gives the guarantee shown below.
But older versions (optaplanner 6.2 and earlier) suffer from that chaotic trigger behaviour (as fixed by PLANNER-252 - yes I know that issue number by heart - and yes, I am not the only one) could drive a developer (who's working on a complex model with multiple shadow variable(s)) insane and provide a one way ticket to the asylum.
Fortunately it has been fixed a few months ago, so upgrade to 6.3.0.Final or later and keep your sanity.
While studying for Interviews, this question came to my mind.
I am planning to design a parking lot and I am assuming the following things:
It has multiple levels. Each Level has 2 rows.
The vehicle type could be small, compact and large.
Each row at a certain level has multiple parking spots.
Each parking spot has red/green light indicator( Red- No space, Green- Free space)
Also each parking spot will have size small, compact and large.
6(optional). Also want to add handicapped person situation.
These are some of the assumptions that I could come up with(Not sure if they are enough or I need more).
I was thinking of designing the system in such a way that as soon as the Vehicle enters the Parking entrance.
He should be given information that where is the nearest vacant spot available(For example- Level 3, Row 2, Spot # 10)
I would like to know how to go about designing such a system? I have seen many other designs but none achieves this i guess.
Not sure what you want to achieve through point 6, but the rest are pretty simple to achieve with an OO design, through the usual abstraction, inheritance and polymorphism principles.
You can have an interface called AvailabilityIndicator which has a boolean method isAvailable(), which represents the light indicator (the bulb will show red if isAvailable() is false, and green if true).
You can have an abstract class called ParkingSlot, which implements AvailabilityIndicator.
This could have the level, row and spot number in it.
You can have 3 classes LargeParkingSlot, CompactParkingSlot and SmallParkingSlot which extend ParkingSlot. (Not that your functionality actually needs this, unless the different parking slots have different behaviours or data you want to model, but since you mentioned you wanted an OO approach I mentioned it, otherwise a simple slotType parameter in ParkingSlot would do.)
Then its a question of when the vehicle arrives, checking what type of slot it needs and looking up which are the available ones that match. You might want to put them in a Map data structure which maps each slot type to the list of available ones, so that when one is taken it is removed and put in a separate unavailable list, for fast lookup of available slots when a vehicle arrives.
Good day!
I am a newbie on creating database... I need to create a db for my recruitment web application.
My database schema is as follows:
NOTE: I included the applicant_id on other tables... e.g. exam, interview, exam type.
Am i violating any normalization rule? If i do, what do you recommend to improve my design? Thank you
Overall looks good. A few minor points to consider:
Interviewer is also a person. You will need to use program logic to prevent different / misspellings.
The longest real life email address I've seen was 62 characters.
In exam you use the reserved word date for a column name
(subjective) I would rename applicant_date to applied_at
I don't see a postal / zip code for the applicant
All result columns are VARCHAR(4). If they use the same values, can they be normalized?
Birthdate is better to store then age. You don't want to schedule someone for an interview on their birthdate (or if you're cruel by nature, you do want that :) ). Age can be derived from it and will also be correct at all times.
EDIT:
Given that result is PASS or FAIL, simply declare the field a boolean and name it 'passed'. A lot faster.
One area where I could see a potential problem is the Interviewer being integrated in interview. Also I would like to point at the source channel in applicant, which could potentially get blobbed (depending of what you're going to store in there).
You don't seem to be violating any normalization rules upon first glance. It's not clear from your schema design, however, that the applicant_id is a referencing the applicant table. Make sure you declare it as a foreign key that references the applicant table when actually implementing the scehma.
Not to make any assumptions on your data, but can the result of a screening be stored in 4 characters?
Age and gender are generally illegal questions to ask in interviews so you may not want to record such things. You might want a separate interviewer table. You also might want a separate table that stores qualifications so you can search for people you have interviewed with C# knowledge when the next opening comes up. I'd probably do something like a Qualifications table that is the lookup for quals you want to add to the applicant qualfications table. Then you'd need the qualification id, applicantId, years, skill level in the Applicant Qualification table.
I notice results is a varchar 4 field, I assume you are planning to put Pass/fail in it. I would consider having a numeric score as well. The guy who got 80% of the questions right passed but the guy who got 100% of them right might be the better candidate. In fact for interviews I might have interview questions and results tables. Then you can record the score and any comments about each question which can help later in evaluation of a lot of candidates. We did this manually in paper spreadsheets once when we were interviewing several hundred people (we had over a hundred openings at the time and this was way before personal computers) and found it most helpful to be able to compare answers to questions. It's hard to remember 200 people you interviewed and who said what. It might help later when you have a new opening to find the people who were strong onthe questions most pertinent to the new job who might not have been given a job at the time of the interview(5 excellent candidates, 1 job for instance).
I might also consider a field to mark if the candidate is unaccepatble for ever hiring for some reason. Such as he committed a felony or he lied on the resume and you caught him or he was just totally clueless in the interview. This can make it easy to prevent this person from being considered repeatedly.
I think that your DB structure has a lot of limitation for future usage. For example you can even have a description of the exam because this stable store the score and exam date. It may by that this kind of information are already stored in another system and you have to design only the result container. But even then the exam, screen and interview are just a form of test, that why the information about should be stored in one table and distinguished by some type id. If you decide to this approach you have to create another table to store the information about result
So the definition of that should look more like this:
TEST
TEST_ID
TEST_TYPE_ID ref TEST_TYPE - Table that define the test type
TEST_REQUIRED_SCORE - The value of the score that need to be reach to pass the exam.
... - Many others properties of TEST like duration, expire date, active inactive etc.
APPLICANT_RESULTS
APPLICANT_ID ref APPLICANT
TEST_ID = ref TEST
TESTS_DATE - The day of exam
TEST_START - The time when the test has started
TEST_FINISH - The time when the test has ended
APPLICANT_RESULT - The applicant result of taken test.
This kind of structure is more flexible and give the easy way to specify the requirements between the test in table like this
TEST_REQUIREMENTS - Table that specify the test hierarchy and limitation
TEST_ID ref TEST
REQUIRED_TEST ref TEST
ORDER - the order of exams
Another scenario is that in the future your employer will want to switch to an e-exam system. In that case only think what you will need are:
Create table that will store the question definition (one question can be used in exam, screen or interview)
Crate table that will store the question answers.
Create table that will store the information about the test question.
Create table for storing the answer for each question given from applicant.
A trigger that will update the over all score of test.