This is a string value that I want to store in a model.CharField:
"8;4,8;0;D;0;0;"
Is there a way of efficiently querying entries in search for entries where the last value only would be 1? Or for example where one of the two values after the first semicolon would be 6?
Or is this a case where it's better to create seperate fields for each value? Which would be unfortunate because than I would need to create 60 or more fields instead of around 10.
Storing values that way means that your database is not in "First normal form" (1NF - https://en.wikipedia.org/wiki/First_normal_form). Normalizing your database makes it easier to search (amongst many other benefits).
Check the 3NF wikipedia article for more details (https://en.wikipedia.org/wiki/Third_normal_form) and references.
Related
I have a multi-valued people picker and a multi-valued Lookup field that I need to read all the entries in a 2013 workflow. I know how to create a workflow that retrieves the data and iterate through each list item using REST and a dictionary. Given I'm iterating through each item, I need to now iterate through each multi-valued field.
In the past, I have done this using a loop iterator and a second dictionary entry representing the data in the multi-valued field, but I don't have access to this code anymore. I can use a loop and use the find function parsing through my responseContent, but this is not reliable since my reponseContent will have multiple records in it and I know it can be done using a second dictionary entry.
My REST query is:
_api/lists/GetByTitle('EmailSetup')/Items?$select=EmailYN,EmailSubject,EmailBody,EmailTo/EMail,Emailcc/EMail,EmailToWorkflowPerson/Title,EmailccWorkflowPersons/Title&$filter=(Title%20eq%20%27BSM%20Review%27)%20and%20(WorkflowName%20eq%20%27ProcessBSMRequests%27)&$expand=EmailTo,Emailcc,EmailToWorkflowPerson,EmailccWorkflowPersons
Where my multi-valued fields are the Emailcc and EmailccWorkflowPerson, (people picker and lookup respectively).
I have my first dictionary as the following data structure that captures the requestHeaders
Accept String application/json;odata=verbose
Content-Type String application/json;odata=verbose
In my first loop I get all my attributes, but not certain how to get the multi-valued fields Emailcc and EmailccWorkflowPersons.
Yes, I can parse through my response, but there's a better way to somehow put these multi-value fields into a structure and then loop through these.
What I need is what is that structure (dictionary) and how do you get the data into that structure and then how do you loop through that structure.
The final result should be of the sort (psuedocode) where Index is which record I am on and Index2 is which multi-value I am on.
d/results([%Varaible: Index%])/Emailcc/Email[%Variable: Index2%])xxx
With a lot of debugging I have gotten half my answer and maybe someone can help me with the other half. The data structure of the data when it comes back via the REST looks like (some masking of our own data):
responseContent={"d":{"results":[{
"__metadata":{"id":"Web\/Lists(guid'c7bb71c8-a9dd-495f-aa5f-4dcacdf8db5c')\/Items(1)","uri":"https:\/\/xxxxx.xxxxxx.xxxxxxxxx.xxx\/hc\/teams\/MES\/_api\/Web\/Lists(guid'c7bb71c8-a9dd-495f-aa5f-4dcacdf8db5c')\/Items(1)","etag":"\"13\"","type":"SP.Data.EmailSetupListItem"},
"EmailTo":{"__metadata":{"id":"b493bee4-ec1a-4b76-a028-11766bdb7e5b","type":"SP.Data.UserInfoItem"},"EMail":"xyxee.dyff#homeward.com"},
"EmailToWorkflowPerson":{"__deferred":{"uri":"https:\/ \/xxxxx.xxxxxx.xxxxxxxxx.xxx\/hc\/teams\/MES\/_api\/Web\/Lists(guid'c7bb71c8-a9dd-495f-aa5f-4dcacdf8db5c')\/Items(1)\/EmailToWorkflowPerson"}},
"Emailcc":{"results":[{"__metadata":{"id":"790a690a-515b-4d07-bba3-73bf325fbbed","type":"SP.Data.UserInfoIt em"},"EMail":"xyxee.dyffns1#homeward.com"},{"__metadata":{"id":"3d77e75c-5fa8-4df6-937c-97e572714843","type":"SP.Data.UserInfoItem"},"EMail":"xyxee.dyffr#homeward.com"}]},
"EmailccWorkflowPersons":{"results":[{"__metadata":{"id":"06582ed9-09 10-4932-9b43-0cfb072942c7","type":"SP.Data.WorkflowPersonsListItem"},"Title":"Assistant Administrator"},{"__metadata":{"id":"13d03566-1703-4550-a21f-08ea286d4940","type":"SP.Data.WorkflowPersonsListItem"},"Title":"Initiator"}]},
"EmailYN":"No",
"EmailSubject":"BSM Request # %%ID%%",
"EmailBody":"<div class=\"ExternalClass645790473F7D4B62BE6224DD7B93990F\">%%IDLINK%%<br><\/div><div class=\"ExternalClass645790473F7D4B62BE6224DD7B93990F\">and the BSM# %%ID%%<br><\/div><div class=\"ExternalClass64 5790473F7D4B62BE6224DD7B93990F\"><br><\/div>"
}]}}
I created another dictionary variable, EmailResults just as the first one to store the multi-value emailcc addresses.
Then the following Get:
Get d/results([%variable: Index%)/Emailcc/results from Variable:responseContent (Output to Variable: EmailccResults)
To get the record count, I use Count Items in the EmailccResults
I set my second index to start at zero and loop through the number baseed on the count in EmailccResults.
To set my intermediate email address (getting one value at a time from the mult-value People picker).
Get d/results([%variable: Index%)/Emailcc/results(%Variable: Index2%)/EMail from Variable: responseContent (Output to Variable: EmailCc)
then I increment the Index2 variable and go to the next record. This works perfectly.
Now my problem is I have a multi-value Lookup that is included in this query (see what the results are above). I attempt the same logic and I am successfully getting the count, but not the Title fields.
My get is:
Get d/results([%variable: Index%)/EmailccWorkflowPersons/results from Variable:responseContent (Output to Variable: EmailccResults)
My actual assignment is:
Get d/results([%variable: Index%)/EmailccWorkflowPersons/results(%Variable: Index2%)/Title from Variable: responseContent (Output to Variable: tmpvar)
** the Lookup works exactly the same way. My problem was that my get above had some blank lines in the text box.
I am writing a simple app in django that searches for records in database.
Users inputs a name in the search field and that query is used to filter records using a particular field like -
Result = Users.objects.filter(name__icontains=query_from_searchbox)
E.g. -
Database consists of names- Shiv, Shivam, Shivendra, Kashiva, Varun... etc.
A search query 'shiv' returns records in following order-
Kahiva, Shivam, Shiv and Shivendra
Ordered by primary key.
My question is how can i achieve the order -
Shiv, Shivam, Shivendra and Kashiva.
I mean the most relevant first then lesser relevant result.
It's not possible to do that with standard Django as that type of thing is outside the scope & specific to a search app.
When you're interacting with the ORM consider what you're actually doing with the database - it's all just SQL queries.
If you wanted to rearrange the results you'd have to manipulate the queryset, check exact matches, then use regular expressions to check for partial matches.
Search isn't really the kind of thing that is best suited to the ORM however, so you may which to consider looking at specific search applications. They will usually maintain an index, which avoids database hits and may also offer a percentage match ordering like you're looking for.
A good place to start may be with Haystack
I asked a question similar to this previously (How to use RecId as a foreign key in a form) but would like to explore it a bit further in a more complex scenario.
Replacement keys work great when you have indexes set up and allow duplicates set to no, but they don't seem to work at all with multiple-field indexes or when allow duplicates is set to yes.
Is there way, programmatically, to replace a foreign key in a grid with a translated value without using replacement keys? I tried writing a display method to override the field, but some odd behavior resulted--fields moving around in the grid, and the display method being unaware of which row to use, thus all values in the entire column were the same.
Table A: Bob:1, Sally:1, Sue:3
Table B: 1:Apples, 2:Apples, 3:Oranges
The "people" are tied to their favorite "foods" by the food RecId, refererenced in the People table. Assume there is additional data in other columns that make these records unique, so consolidating "1:Apples" and "2:Apples" is not possible.
It seems there should be a way to write a display method to overwrite a field value in a grid. Any suggestions? Sample code?
Thanks
Firstly, surrogate FK replacement does (or at least should) work with composite keys (e.g., {First Name, Last Name}).
Secondly, you state that there is "additonal data in other columns" that make these records unique...Then why aren't these columns being combined with the food's name to form an alternate key? The data model seems incorrect (or at least some metadata isn't being made consistent with the conditions you've stated)
Thirdly, any Field Group can be chosen as the ReplacementFieldGroup on a Reference Group control. That alone will allow you to do basically whatever you want. That said, I would strongly encourage you to use an alternate key as your replacement field group whenever possible due to the semantics of surrogate FK replacement.
Flow:
1) User types a value(s) into reference group.
2) User's tabs out.
3) User's typed value(s) are used to look up a record in the related table.
4a) If the user's typed in value(s) are uniquely mapped to a record that record is chosen, else,
4b) If the user's typed in values are not unique a lookup is presented to allow the user to pick which record they "meant". Note that the lookup must therefore present a collection of uniquely identifiable records so that the user knows which record to pick (if the records all look the same in the lookup then they'll have no idea what in the hell they should pick.)
5) Upon successful resolution of the typed values, the record is set back on the source form.
Given this flow, it is obvious that steps 3-5 will be broken if there is no unique index (key) on the table. (How is the user supposed to specify a unique reference to the record if the record has no means of being uniquely identified (assuming you don't want to display RecId to the user)???)
In the exceptional case that you decide that you still want to use a non-unique index as your replacement field group you must implement resolveReference and lookupReference to provide the user a unique resolution/lookup experience (to handle steps 3-5 in the above flow). Note: The common use case for this is wanting to effectively eliminate non-selective fields from being displayed in Reference Group and instead letting some outer context or mode implicitly set that value. E.g., if the alternate key was {Size, Color}, one could potentially make "Color" a global form context--perhaps by having the user pick a color at the top of the form--and only have the user enter Size into Reference Group...The Color could then be implicitly added back via the resolveReference and lookupReference overrides.
I'm trying to find the best way to go about my problem and I would love your input. I am trying to allow users to scan multiple barcodes into a text area. After they are submitted they are split into an array. The user then inputs how many iterations of each value in the array are to be inserted into a MySQL database. I've achieved this using PHP and session variables, looping through the array one step at a time. With Django I've found it a little more difficult and I am wondering if I should just have a "temporary" table in my database that gets refilled with the values from the array of barcodes. The following pages then pull each value from the table instead of using any sort of session variables.
Edit:
I apologize for the confusing question. Let me try and clear it up a bit:
I need to render a view based on each value in the user-submitted array. When it is first submitted, a view is rendered for the first value. When the user hits "Next" a view will be rendered for the second value in the array, and so on.
As for the database issue, each value can have two "types." The user will declare how many of each type is added to the database in each of the views I am trying to render.
Thank you.
this is nothing about django.
forget that temporary table.
add a field "filled" to ur table
select 1st not-filled row, and show "refill" page by this row
then update user input number back to db, set "filled" to "true" at same time.
You probably can port your PHP solution using a Django session object.
I'm not sure if that "one item at a time" is a feature or a "it was easier to code that way" thing, but in the second case - you may want to use Django Formsets to display all items at once and avoid looping through the array.
I need to pick a document from a collection at random (alternatively - a small number of successive documents from a randomly-positioned "window").
I've found two solutions: 1 and 2. The first is unacceptable since I anticipate large collection size and wish to minimize the document size. The second seems ineffective (I'm not sure about the complexity of skip operation). And here one can find a mention of querying a document with a specified index, but I don't know how to do it (I'm using C++ driver).
Are there other solutions to the problem? Which is the most efficient?
I had a similar issue once. In my case, I had a date property on my documents. I knew the earliest date possible in the dataset so in my application code, I would generate a random date within the range of EARLIEST_DATE_IN_SET and NOW and then query mongodb using a GTE query on the date property and simply limit it to 1 result.
There was a small chance that the random date would be greater than the highest date in the data set, so i accounted for that in the application code.
With an index on the date property, this was a super fast query.
It seems like you could mold solution 1 there, (assuming your _id key was an auto-inc value), then just do a count on your records, and use that as the upper limit for a random int in c++, then grab that row.
Likewise, if you don't have an autoinc _id key, just create one with your results.. having an additional field with an INT shouldn't add that much to your document size.
If you don't have an auto-inc field Mongo talks about how to quickly add one here:
Auto Inc Field.