I have a DB structure as follows:
fashion_item
==============
| id | name |
|------------|
| 1 | item1 |
|------------|
| 2 | item2 |
--------------
fashion_colour
===============
| id | name |
|-------------|
| 1 | red |
|-------------|
| 2 | white |
|-------------|
| 3 | green |
---------------
| 4 | black |
---------------
fashion_color_fashion_item
======================================
| fashion_item_id | fashion_color_id |
|------------------------------------|
| 1 | 1 |
|------------------------------------|
| 1 | 2 |
|------------------------------------|
| 1 | 3 |
|------------------------------------|
| 2 | 2 |
|------------------------------------|
| 2 | 3 |
--------------------------------------
The fashion_color_fashion_item table is a join table for a many to many relationship between fashion_item and fashion_color.
Using Eloquent, I would like to retrieve a list of results from fashion_item (based on other criteria) then get a distinct list of fashion_colour id's from the results, with a count.
I need to end up with a value like the following, though I'm willing to transform the relevant data from another structure.
[ 1 => 1, 2 => 2, 3 => 2, 4 => 0 ]
In this format, there is a key which reflects a fashion_color.id, and a value which represents the number of times the colour is referenced by a row from the result set.
fashion_colour.id's with no count result can be null, 0 or simply not present.
I have the correct relationships setup between the tables and I can return results using all of the regular methods, including eager loading the colour data.
I've been able to achieve a similar result on direct belongs to relationships by grouping the results based on the foreign key in the table and counting the array. This won't work for many-to-many relationships.
e.g.
$silhouetteFilterList = array();
$results = FashionItem::(where clauses, etc...)->get();
$silhouettes = $results->groupBy('fashion_silhouette_id')->all();
foreach ($silhouettes as $key => $value) {
$silhouetteFilterList[$key] = count($value);
}
P.S. We're currently using Eloquent 4.1 because we need PHP 5.3 compatibility, we're hoping to move on soon. Comments regarding the antiquated nature of either PHP5.3 or Eloquent 4.1 will not be welcome :p
We are using Eloquent but not Laravel.
Try eager loading the relationship:
$collection = $items->with('colors')->get();
Each item in the collection should now have a colors variable that represents an array of colors for that particular item.
Since this is a general Laravel Collection, you can use collection and array methods to get it in the format you like.
Related
I suspect this question is already well-answered but perhaps due to limited SQL vocabulary I have not managed to find what I need. I have a database with many code:description mappings in a single 'parameter' table. I would like to define a query or procedure to return the descriptions for all (or an arbitrary list of) coded values in a given 'content' table with their descriptions from the parameter table. I don't want to alter the original data, I just want to display friendly results.
Is there a standard way to do this?
Can it be accomplished with SELECT or are other statements required?
Here is a sample query for a single coded field:
SELECT TOP (5)
newid() as id,
B.BRIDGE_STATUS,
P.SHORTDESC
FROM
BRIDGE B
LEFT JOIN PARAMTRS P ON P.TABLE_NAME = 'BRIDGE'
AND P.FIELD_NAME = 'BRIDGE_STATUS'
AND P.PARMVALUE = B.BRIDGE_STATUS
ORDER BY
id
I want to produce 'decoded' results like:
| id | BRIDGE_STATUS |
|--------------------------------------|------------ |
| BABCEC1E-5FE2-46FA-9763-000131F2F688 | Active |
| 758F5201-4742-43C6-8550-000571875265 | Active |
| 5E51634C-4DD9-4B0A-BBF5-00087DF71C8B | Active |
| 0A4EA521-DE70-4D04-93B8-000CD12B7F55 | Inactive |
| 815C6C66-8995-4893-9A1B-000F00F839A4 | Proposed |
Rather than original, coded data like:
| id | BRIDGE_STATUS |
|--------------------------------------|---------------|
| F50214D7-F726-4996-9C0C-00021BD681A4 | 3 |
| 4F173E40-54DC-495E-9B84-000B446F09C3 | 3 |
| F9C216CD-0453-434B-AFA0-000C39EFA0FB | 3 |
| 5D09554E-201D-4208-A786-000C537759A1 | 1 |
| F0BDB9A4-E796-4786-8781-000FC60E200C | 4 |
but for an arbitrary number of columns.
In my previous question:
How to create a filter that does the SQL equivalent of WHERE ... IN for SQLite.Swift
I asked how to how to do a WHERE...IN in swift.
Now, how do I filter optional Expressions?
I have a versioned database that allows me to add columns to tables after it was created. And to achieve that, I created the column with
static let timeTag = Expression<String?>("timeTag")
and then called
try DB.run("PRAGMA user_version = 2")
let query = table.addColumn(timeTag)
let _ = try DB.run(query)
all that works and the table does indeed have that column and I can add data to the column and etc.
usually when I need to filter in other columns, I do
table.filter(self.id == id && self.name == name)
and when I need to do a where in,
table.filter((myNameArray.contains(self.name))
now I want to filter for the timeTag column with an array timeTagArray which is an array of wanted timeTags to look for. I tried
table.filter(timeTagArray.contains(self.timeTag))
and the table example:
+----+-------+-----------+
| id | name | timetag |
+----+-------+-----------+
| 1 | Joe | Morning |
+----+-------+-----------+
| 2 | Alan | Afternoon |
+----+-------+-----------+
| 3 | Brad | Morning |
+----+-------+-----------+
| 4 | Ian | Evening |
+----+-------+-----------+
| 5 | Louis | Midnight |
+----+-------+-----------+
if my timeTagArray = ["Morning", "Midnight"] then I should get back rows 1, 3, 5.
but it gives me the error that says
Cannot assign value of type 'Expression<Bool?>' (aka 'Expression<Optional<Bool>>') to type 'Expression<Bool>'
I have a list of survey results that looks similar to the following:
| Email | Question 1 | Question 2 |
| ----------------- | ---------- | ---------- |
| test#example.com | Always | Sometimes |
| test2#example.com | Always | Always |
| test3#example.com | Sometimes | Never |
Question 1 and Question 2 (and a few others) have the same discrete set of values (from a dropdown list on the survey).
I want to show the data in the following format in Tableau (a table is fine, but a heatmap or highlight table would be best):
| | Always | Sometimes | Never |
| ---------- | ------ | --------- | ----- |
| Question 1 | 2 | 1 | 0 |
| Question 2 | 1 | 1 | 1 |
How can I achieve this? I've tried various combinations of rows and columns and I just can't seem to get close to this layout. Do I need to use a calculated value?
As far as I know - it is not natively possible with Tableau, because what you have is kind of a pivot table.
What you can do is unpivot the whole table as explained here https://stackoverflow.com/a/20543651/5130012, then you can load the data into Tableau and create the table you want.
I did some dummy data and tried it.
That's my "unpivoted" table:
Row,Column,Value
test,q1,always
test,q2,sometimes
test1,q1,sometimes
test1,q2,never
test10,q1,always
test10,q2,always
test11,q1,sometimes
test11,q2,never
And that's how it looks in Tableau:
I'm indexing some data using Sphinx. I have objects that are categorised and the categories have a heirarchy. My basic table structure is as follows:
Objects
| id | name |
| 1 | ABC |
| 2 | DEF |
...
Categories
| id | name | parent_id |
| 1 | My Category | 0 |
| 2 | A Child | 1 |
| 3 | Another Child | 1 |
...
Object_Categories
| object_id | category_id |
| 1 | 2 |
| 2 | 3 |
...
My config currently is:
sql_query = SELECT categories.id, objects.name, parent_id FROM categories \
LEFT JOIN object_categories ON categories.id = object_categories.category_id \
LEFT JOIN objects ON objects.id = object_categories.object_id
sql_attr_uint = parent_id
This returns category IDs for any categories that contain objects that match my search, but I need to make an adjustment to get objects in that category or any of it's children.
Obviously, I could UNION this query with another that gets ID from matched categories parents, and so on (it could be up to 4 or 5 levels deep), but this seems hugely inefficient. Is there a way to return multiple document IDs in the first field, or to avoid repeated needless indexing?
I'm a Sphinx noob, so I'm not sure how to approach the problem.
See
http://www.sitepoint.com/hierarchical-data-database/
its talking about a database, but the same system works equally well within sphinx. It can take a while to get your head around, but its well worth mastering (IMHO!).
(ie add the left/right columns to the database, and then include them as attributes in the sphinx index)
I have some tables with date and id as two of the columns:
ID | DATE | ITEMS
1 | 7/1/13 | More Apples
2 | 6/29/13 | Carrots
1 | 6/20/13 | Apples
2 | 6/10/13 | Broccoli
I would like to order them by DATE and then group them by ID's so that all the 1's are together ordered by dates:
ID | DATE | ITEMS
1 | 7/1/13 | More Apples
1 | 6/20/13 | Apples
2 | 6/29/13 | Carrots
2 | 6/10/13 | Broccoli
How would I accomplish this?
I'm thinking my solution might be a sub-select but I haven't gotten anywhere closest to what I want to achieve. Note that the above tables are very simplified. I'm actually trying to accomplish this with many tables joined and many different fields being displayed. Thanks.