Why are you talking about tables? Are you creating an object model or a database model? For an object model, there’s no reason a Dog can’t have a List<Owner> and an owner have a List<Dog>. Only if you have attributes on the relationship do you need an intermediate class (what UML calls an Association Class). … Read more
Ran into this problem as well. I found out you need to call the java property for some reason I don’t know why. So just do this: from pyspark.ml.tuning import TrainValidationSplit, ParamGridBuilder, CrossValidator from pyspark.ml.regression import LinearRegression from pyspark.ml.evaluation import RegressionEvaluator evaluator = RegressionEvaluator(metricName=”mae”) lr = LinearRegression() grid = ParamGridBuilder().addGrid(lr.maxIter, [500]) \ .addGrid(lr.regParam, [0]) \ … Read more
Good question, the problem is that it depends on the definion of the terms, I think they differ slightly based on the sources. I would agree with previous answer – domain models are for describing the problem domain, at least the part you need to develop a solution. You describe all the various entities, their … Read more
See archived version with outlinks here. As of May 26, 2023, there is no standard modeling language for pure functional programming, but there are alternatives: 1. UML UML has traditionally been associated with object-oriented programming (OOP), mostly because of its historical roots1, 2, but one can certainly attempt to use it for different programming paradigms … Read more
I’ve used DBDesigner before. It is an open source tool. You might check that out. Not sure if it fits your needs. Best of luck!
Don’t disagree with most of the above although it’s perhaps worth expanding a little. The single most important concept in DDD is to focus on the problem domain. To put technology obsession to the side and concentrate primarily on modelling the problem you’re trying to solve. So put ajax, ORMs, databases, frameworks etc. into the … Read more
Whether you should use a property, a label or a node for the category depends on how you will be querying the data. (I’ll assume here that you have a fairly small, fairly fixed set of categories.) Use a property if you won’t be querying by category, but just need to return the category of … Read more
There is an article titled “Principles of XML design: When to use elements versus attributes” on IBM’s website. Though there doesn’t appear to be many hard and fast rules, there are some good guidelines mentioned in the posting. For instance, one of the recommendations is to use elements when your data must not be normalized … Read more
Security models are a large (and open) field of research. There’s a huge array of models available to choose from, ranging from the simple: Lampson’s Access control matrix lists every domain object and every principal in the system with the actions that principal is allowed to perform on that object. It is very verbose and … Read more
There have been some great answers to this already, but I wanted to add some more recent CouchDB features to the mix of options for working with the original situation described by viatropos. The key point at which to split up documents is where there might be conflicts (as mentioned earlier). You should never keep … Read more