Office365-REST-Python-Client seems unable to update Lookup Columns in Sharepoint - sharepoint-online

I managed to follow another users question about uploading files and set metadata here :- Office365-REST-Python-Client 401 on File Update
And I am now able to do what it says on the tin and upload files and set metadata. However I'm struggling when using the following code, kindly offered up by one of the contributors to the question I linked to above. (Vadim I think).
list_item = target_file.listitem_allfields # get associated list item
list_item.set_property("Title", "New title")
list_item.update()
ctx.execute_query()
This works fine for normal metadata, but I have a column which is a lookup column, and I want to update that one.
If I use the Shareplum library, I can do this by setting the column to be the ID of the list item the lookup column points to, and that works fine.
So I tried using :-
list_item.set_property("Title",1)
...... as the ID of the lookup list item was 1, but this doesn't work using the Office365-REST-Python-Client package.
Is there a way to set a lookup column using this package? I tried using an ID, and also the Text value, but nothing seemed to work.
I'd much rather use this package than Shareplum, as Shareplum seems deficient in other ways.
Any pointers would be much appreciated.

The answer to this was fairly straightforward -
field_value = FieldLookupValue(lookup_id=1)
item_to_update.set_property("Department", field_value).update().execute_query()

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I haven't seen how your original attempt at PXDimension looked, but I'm going to take a guess and assume you tried to reference a new custom field contained in a setup table, something like:
[PXDimension(typeof(XXMySetup.usrMyCustomField))]
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I am doing a workflow for a document library. I put a OnWorkflowItemChanged, and I want to get the value of the column which is changed. I use the workflowProperties.Item["name"] and use the afterProperties. But when I use the workflowProperties.Item["column name"], I still got the original value. When I use the afterProperties, it's NULL.
Then I make another workflow that is the same as above for a list. I can use the workflowProperties.Item["column name"] to get the new value in OnWorkflowItemChanged.
Has anyone come across this problem before? Can you give me some help?
The question seems to mix up Item with ExtendedProperties. As to why a difference is seen on a List/Document Lib, it might have something to do with versionining or perhaps the internal serialization is different. Anyway, some of my experience is outline below. I hope it may be of use:
Use the GUID (as a Guid object, not a string) to access the Before / After ExtendedProperties field. Using the Display Name in the ExtendedProperties will not work. The documentation on it is wrong. You can use SPList.Fields to go from Display Name to Column ID (Guid).
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I'm starting to do some test on SubSonic 3 and I'm missing some stuff.
1st: Where's the Table names constants? The place where we could ask for the same of a certain table using intelisense...
2nd: Same as the above but for the table columns... where are they?
This is very useful mostly when you need to pass those names as string... it you need to refactor your DB we don't need to look through all the code to find where was I using that column!! Once you re-generate the code the compiler tells you!
3rd: Now how can I perform an ExecuteReader on a certain table like I'm used to on 2.x through the Query object? I used this a lot for list where I really don't need the business objects (BO) overhead... When I needed a BO (for showing a grid row details) I create it from the row itself...
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Thanks guys!
Alex
1st: Where's the Table names constants? The place where we could ask for the same of a certain table using intelisense...
In Structs.tt find the following line of code at line 47:
<# foreach(var col in tbl.Columns){#>
Add the following code above it:
public static string TableName { get { return "<#=tbl.Name#>"; } }
Now you'll have a property that returns the name of the table.
2nd: Same as the above but for the table columns... where are they?
In the generated Structs.cs file, this is included in the 3.0.0.3 version
3rd: Now how can I perform an ExecuteReader on a certain table like I'm used to on 2.x through the Query object? I used this a lot for list where I really don't need the business objects (BO) overhead... When I needed a BO (for showing a grid row details) I create it from the row itself...
If you're using SqlQuery object you can call ExecuteReader on it. Alternatively you can use Linq syntax to generate return custom shaped objects and they'll get mapped automatically.
1st and 2nd: It's not implemented in the default tt-files.
A similiar question:
SubSonic 3 Simple Query Tool
Problem is that's not a correct implementation if you want the 2.x way - the XColumn properties used to be column objects and not string constants, those were found under the Columns struct. So I hope that check-in will not be accepted and that someone will 2.x-ify it correctly.
Anyway as you can see it seems pretty easy to fix it on your own.

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