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Maybe it late but it may help others. Recently I faced this error and I solved it. Your UI is rendering in Main isolate and your download events come from background isolate. Because codes in callback are run in the background isolate, so you have to handle the communication between two isolates. Usually, communication needs to take place to show download progress in the main UI. Implement the below code to handle communication:

If you are up for a refactor then i would suggest you to refactor the component as below . I would still prefer the MealItems to be in a separate file of its own.

There is no straight way to do this, you can use update with aggregation pipeline starting from MongoDB 4.2,

• match query if regex does not match "+1" string at the start of the number
• $map to iterate loop of storeNumbers
• $cond check condition if number does not match "+1" string at the start of the number and number field is not string and string type then concat "+1" before number using $concat otherwise do nothing
• $mergeObjects to merge current object with new update number field

Unfortunately, this is indeed "too broad a question". (The shortest possible answer is "read everything ever written on the differences between conceptual modeling and formal logical modeling, and how to go from the former to the latter.".) I can only provide a number of hints.

It seems like you use an E/R syntax where entities are rectangles and relationships are diamonds. The ellipses indicate "properties" of the entities. However, E/R is a conceptual modeling technique while normalization theory applies to formalized models in which everyting is represented as relations (mathematical sense of the word). So you need to worry about how you are going to make everything in this conceptual model represented as "relations with attributes". Hint : for the entities, you seem to have them already, but what about the relationships (note carefully : relationSHIP is not the same thing as relation !!!). For example, if a given cashier works 40% for one restaurant and 60% for another one, how are you going to represent that ? Is that situation supposed to be supported ?

Then, it seems like you have already thought about identifiers, because you underlined them. The thing that normalization theory is about, +-, is to facilitate the identification of all the keys that apply to a relation in the logical schema. Look at your "restaurant" entity. You seem to already have decided that, in FD terms, {Name} -> {Address, ContactNo}. What you need to worry about is questions like "is it also the case that {ContactNo} -> {Name, Address} ?". Or iow, "can it be the case that two distinct restaurants have the very same contact n° ?".

Further, look at the "OrderDetail" property in "Bill". Formalizing to a logical model means you're going to have to decide on a data type for this property. So what "data type" are you going to use ? To my mind, the "detail" of an order is the entire list of items ordered, with their quantities ordered etc etc. Is that something you are going to represent as a column in some table in your db ? (I'm not implying to say that your model is wrong here. Yes, orders have order details. It's just that saying so remains at a very high level of abstraction that +- conflicts with the lower level of abstraction that you managed to achieve for the other entities. By including that as a property, you are communicating that "it's there and I know it is there, but I still don't have a clue as to what it looks like". And that calls for "then elaborate that first". (Hint : you might find that actually there is also a relationship between "order" and "bill" because "bill" only gets created in the context of on order that was served. This of course also means that you are going to have to formalize that relationship.)

I'm going to stop here.

This regex /^'sql-(\d)+.log'/ doesn't match this string sql-20201212.log. You can try it out on https://regexr.com/

There are a few problems with your regex:

• ' is in your regex but not in your string
• . matches any character expect line breaks, perhaps you want to match only a dot(?), if so, then you'd need to e.g. escape it \.
• you probably don't need to have \d in a group (())

So, this regex ^sql-\d+\.log$ would match sql-20201212.log string. I also added $ to match the end of the string.

Extract the substring between two strings:

You will want the second loop: to iterate across the stat_result.results list, since each member of that list contains two relevant fields: item, containing the original iteration key, and then the stat structure that you are expecting (it looks like this, which you can see for yourself with - debug: var=stat_result)

Did you try to just add: