Finishing the Static Model - Associations - Reading Associations
5 important questions on Finishing the Static Model - Associations - Reading Associations
Associations can have names, independent of the names at the ends or the names of classes/types at the ends.
The name used is “is authored by.” When you supply a name, it is best to write one that reads from left to right or top down.
When you read an association, always start with “one,” “a,” “an,” or “each” or something similar.
The multiplicity is only read on the target side. We ignore the multiplicity and adornments on the source side.
In Fig. 10.18, we are modeling the relationship from A Book to Many Persons and A Person to many Books.
![]()
How do we read this figure?
This reading is a consequence of the equivalence of an association to an attribute.
As an attribute is only the property of an instance, the association end on the target side is also only a property of an instance.
Book → Person: A Book is authored by an ordered set of many Persons in the role of author
When you read in the other direction, you generally will need to change the verb form from active to passive or vice versa.
Another example of a reading direction![]()
When we read in the other direction, we used “is authored by,” the passive form.
We also added another bit of notation, the reading direction indicator < or > .
This triangle points in the direction that the association name is intended to be read.
This indicator is useful in making the diagram more understandable.
However, it makes editing the diagram (such as changing the orientation of the association) more difficult as it may require a manual maintaining of the triangle direction.
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
For my 1st exam I got a C. Then, I started looking for ways to learn better and I came across Study Smart. Since then I have scored a A+, A, A- and another A. I highly recommend it to everyone who wants to hear it. I am so happy with it!!
I was struggling to finish all my first-year subjects for 3 years. Then I discovered Study Smart, which helped me to finish all of them within 3 months.
Because of StudySmart, things are going well in many ways. Before, I always had study stress and no time for anything. Now I feel calm and confident (because of the program). I used to score a B, now I usually score an A or A+.
Hey Chris, I really want to thank you very much for developing the platform, I usually got around C for my exams, now I scored an A+, an A and a A- !!
Since using Study Smart, my average has increased significantly. I even completed a statistics course with a A+ while I'm bad at statistics. I took on extra courses this year, because of Study Smart. Thanks so much!
Ever since I started studying with StudySmart I passed all my exams !!! No more re-sits!! At first, I was happy with a pass and now I only get good grades. Many thanks!
I aced all the courses I studied with Study Smart. For law, I first scored a D, and now an A! I’m 100% sure that I’ll pass all the courses I study with Study Smart.
I always thought I studied well. My grades were fine. I could never have imagined that applying these study skills would have such a huge and direct impact on my grades, my speed and the pleasure I have in learning.
For the first time, I finally feel totally confident about the way I learn. I have the perfect overview and make great progress in terms of speed and the grades I get. Thanks, Chris!
I immediately started to enjoy learning again, and my grades soared. All of a sudden, everything went better. I highly recommend Study Smart to all students..
Being able to create my materials online made the process of studying so much smoother and quicker. I no longer have to spend a huge amount of my time on creating my summaries.
At first, my notes were a mess. Now I use Study Smart to take my notes in a perfectly structured way. It helps me to save a lot of time and do other things I enjoy.
Students that study with Study Smart get better grades. The system applies all the learning methods in such a way that both well-performing students and students who struggle perform much better.
Hi Chris, I would like to thank you very much. Last year I scored C on a course, and this year I got an A+ thanks to your method! Thank you very much!
The largest effect is that my child is more enthusiastic about school! Every parent wants their children to be happy at school, Study Smart made it happen.
In high school, I failed several exams, and that has really changed now. I actually needed this tool very much back then. Since I started studying with StudySmart, I haven't had any D's. My average score is now an A and those are results I would have never had in the past
With my old method, I passed only 3 out of 8 courses. Since I started taking my notes digitally in Study Smart, I have passed all my courses on the first try. For me, StudySmart takes away the stress of wondering if I will pass or not.
Thanks to StudySmart, I passed all my exams, and with better grades than before! On top of that, I have mastered a very good study method now, which I am confident will help me earn my degree.
See Table 10.4, for other properties allowed for an association.
It is certainly possible to have more than one association between two classes, as shown in Fig. 10.20
How do we read this? ![]()
However, starting at one class, the role names at the target classes must be unique.
The role names map to the attribute names when they are in the attribute format subject to the restriction that within a class’s namespace we cannot have two attributes with the same name.
It is ok to have blank role names, as the tools will generate some opaque string behind the scenes.
In the figure, the role names myBooks and myEdits must be different (which they are). Similarly, author and editor must be different (which they are).
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
