I am working with amplify on a project and have difficulty getting one thing the way I want. Not sure is it at this time a matter of me not understanding the tool, or something is missing.
I would like to have 2 tables, with hasMany relation, A hasMany B. I would like to add a security on top of that so only owner of row in table A can access rows in table B that belong to his row in A. Is this possible? I tried some combinations with hasMany and auth but got nowhere.
Additionally I expected that if I create a row in table B with reference to row in table A, I will see it while performing a listA, however it's just empty.
I Appreciate help
Related
I'm having some trouble getting relation deletion to work exactly how I would expect it to.
For example I have two simple tables, users and permissions with a one-to-many relation between users and permissions (or it could be many-to-many in this example as well).
I first tried deleting one of the related permissions using userDatasource.deleteItem() or userDatasource.item.permissions[index]._delete() but when you use either of those functions it marks the record as deleted client side so you run into trouble when you need to insert again.
I then found a related question that said to use item.relation.splice(startIndex, 1) to just break the relation and that worked as expected but now I have a bunch of extra rows in my database with the user foreign key null. I would much rather have the same behavior as .splice but also have it delete those records from the database. Is there any way to do that or is App Maker supposed to detect the broken relation and automatically delete the row from the table?
Just do a check after the splice like this:
if (item.relation.length === 0) {
item._delete();
}
When I update the model from database, I am not able to access to some of the tables as entity.
Through Model Browser, I can see those tables under MyDBEntities.Store (I don't know what it is) but under the Entity Types, these tables are not listed. Tried to downgrade to EF5, tried opening and updating the model with VS2012. Tried deleting and recreating the model so many times but no luck. If I right click on Entity Folder and select Add New Entity, under the Base Types, these tables are not listed either. All tables have PK and FK by the way. Anyone has a clue?
EDIT:
I just noticed, if remove the model and while updating it from database, if only add these 5 tables, they are being added properly. But this time caused the run-time error: Two entities with possibly different keys are mapped to the same row. Ensure these two mapping fragments map both ends of the AssociationSet to the corresponding columns.
When you add an association table that creates M:N relation between two other tables and has no additional attributes, then the association table is not shown in the model.
See http://smehrozalam.wordpress.com/2010/06/29/entity-framework-queries-involving-many-to-many-relationship-tables/.
My issue is related to this question: Entity Framework One-To-One Mapping Issues
I have a Users table that already has a bunch of records.
Users (Id, UserName, Password, FullName, Gender)
I need to add a bunch of notification options for each user:
NotifyForNewComment
NotifyForNewPost
NotifyWhenFriendSignsUp
I may have to add more options later, but there will always be a 1-1 relationship, so my question is whether to store these in a separate table, say UserSettings, or just add them as columns to the Users table.
In the linked question (above), the advice was to create a new table and make the UserId in the UserSettings table as the primary key (because otherwise, Entity Framework doesn't like it). If that's what I have to do, then I have a few questions regarding it:
All my tables have an Id column. The UserSettings will not have an Id column then, since the UserId will be the primary key?
I'd have to turn on Identity Insert for the UserSettings table, so that when I insert a new User record, I can also insert a UserSettings record with the UserId?
Given that I already have a bunch of records in the Users table, what do I have to do if I'm going to introduce the new UserSettings table now which will have a 1-1 relationship with the Users table? Do I just run a script to add records for each user in the Users table with some default values? Or do I make it into a 0-1 relationship?
Since it's a 1-1 relationship, should I not worry about a new table, and instead just add them as columns to the existing Users table?
I think you are missing the point of a UserSettings table. It would have columns like:
UserSettingsId
UserId
Notification
It might also contain things like when the notification was created, whether it is currently enabled, and other information.
If you know exactly what the notifications are, and they are not going to change, then you might consider adding them as separate columns in the user table.
On the other hand, this is a natural 1-N relationship, and you should probably implement it as such.
I am creating my first orchestration in Biztalk and am having trouble coming up with an efficient way to update a database (specifically, up to 3 different tables).
The user calls our service with an inbound message matching a schema which contains emplid (unique id) and then a bunch of name-value pairs (see source schema in this picture). The "name" corresponds to a column in a table (e.g. if the name is "employeename" it corresponds to the NAME column of the EMPLOYEE table). The value of course is the new value that the user wants that column to be updated to.
So they could pass in an update message which only applies to 1 table, 2 tables, or all 3, depending on the fields they want to update for the passed in employee.
I am currently approaching it as 3 separate updates with 3 table adapters (one for each table, one of which is pictured above) but Im having trouble working with the different cases of if they pass in updateValuePairs for all 3 tables, versus only one or only for two tables (the other queries still attempt to run and fail). Am I approaching this right? Or is there a better way to accomplish what I am trying to do?
i would try i different way in order to implement cleaner solution,
create a Store-Procedure that handle the logic to which table to go
than you will need only on mapping and one LOB adapter instead of the 3 you got now
over view solution
1.receive input in the orchestration
2.mapping the input to the Stored procedure generated schema
3.sending the mapped data to the DB/LOB adapter into the DB
here is a link that can help you (im assuming you use biztalk 2010):
How to use Oracle Stored Procedure
i'm having a little problem in my project. i'm using ADO.Net Entity Data Model,
let's say i have 2 Tables:
Offices : a. id
b. Name
Requests: a. rid
b.fname
c.lname
d.mobile
i want the requests table will have a relations to the offices table that each row in requests will have the id of the one of the tables.
i tried to do 1 to many relations but it didn't work , i just couldnt add data to the table.
thanks for your guidence
Your Requests table needs to have a field to relate back to the offices table. Which typically should be named OfficeID or something similar. Add that field and create the relationship from Offices.ID to Requests.OfficeID and it will work fine.