I create a table using geodjango with a column location = models.PointField(geography=True).
class Point(models.Model):
location = models.PointField(geography=True)
Later I want to use ST_snapToGrid method to cluster those locations. But if I use
Point.objects.snap_to_grid(0.001)
I got an error:
function st_snaptogrid(geography, numeric) does not exist
LINE 1: SELECT (ST_SnapToGrid("app_point"."location",000.1)) AS...
This may be caused by the difference between geography and geometry. So how can I use snap_to_grid this method? Thanks!
you could not use Field.geography=True with snap_to_grid.
e.g:
class Point(models.Model):
location = models.PointField(dim=2)
Related
I would like to write small module that inherit sale.order.line and adding reserved lot on sale order line tree view.
under the sale.order.line module, there is the field name move_ids (stock.move , one2many) fields. I would like to create move_ids.move_line_ids.lot_id
So I tried the following code:
lot_name = fields.Char(related="move_ids.move_line_ids.lot_id", string="String")
but no luck and saw internal server error.
jooze
You can not do that, type of related field lot_name is inconsistent with lot_id.
Try to use a computed Many2many field to get all lot ids related to the current record.
Edit:
class SaleOrderLine(models.Model):
_inherit = 'sale.order.line'
lot_ids = fields.Many2many('stock.production.lot', compute='_get_lot_ids')
#api.one
#api.depends('move_ids.move_line_ids.lot_id')
def _get_lot_ids(self):
# returns the union of all lots, with duplicates removed
self.lot_ids = self.mapped('move_ids.move_line_ids.lot_id')
I am trying to reference dynamic tables and fields in a tkinter GUI project using MySQLdb. Using psycopg2.sql to handle an insert statement.
The user select a code, size and color and inputs a quantity. The table names are made up of the size and the code (eg. size-small and code-1111, table_name=small1111). Then the color is the column name and the quantity is an integer entered into the field. The inputs are saved in a dictionary (tdict) when the user selects them. And the dictionary elements are called to be saved in the database table.
table_name = tdict['Size']+tdict['Code']
stmnt = ("INSERT INTO {} (%s, Date) VALUES(%s, %s)").format(sql.Identifier((table_name, tdict['Color'])))
c.execute(sql.SQL(stmnt, (tdict['Quantity'], date)))
The insert query is giving me a TypeError
TypeError("SQL identifiers must be strings")
Can anyone please help? What am I doing wrong? How should the Identifier be made to behave as a string?
Note: I've tried to pass the Identifier elements through a str class but it didn't work. ie
stmnt = ("INSERT INTO {} (%s, Date) VALUES(%s, %s)").format(sql.Identifier((str(table_name, tdict['Color']))))
You are asking sql.Identifier() to create an identifier out of a tuple, e.g. ('small1111','magenta'). Because format() only substitutes into braces {} (and not %s), I think what you actually had in mind was this:
stmnt = sql.SQL("INSERT INTO {} ({}, Date) VALUES(%s %s)").format( sql.Identifier(table_name), sql.Identifier(tdict['Color']) )
I'd suggest you rethink your database design, though --- you should probably have columns named size, code, and color rather than separate tables and columns for each. That will prevent you from having to add a new column each time a new color or a new table for each new size or code. SELECT count(*) FROM inventory WHERE size = 'small' AND code = '1111' GROUP BY color seems preferable to having to create queries dynamically.
This error message will also appear when you have a typo error where you should have used sql.Literal('someFixedNumber'), but instead using sq.Identifier('someFixedNumber')
I am trying to "trellis" a summary table using a script. The TrellisVisualization is not available for the SummaryTable class. Using the GUI, I can trellis a summary table by assigning a specific column to the Categorization property under Columns Properties. However, while using the IronPython script, I don't see any property named Categorization for the SummaryTable object. So, I tried assigning the column to the CategoryAxis as follows:
mySummaryTable.CategoryAxis = "<[myColumn]>"
But this throws an error:
AttributeError: 'SummaryTable' object has no attribute 'CategoryAxis'
I also tried using Axis or CategoricalAxisBase etc. as properties, but these options did not work out. If anyone has more ideas on this, please let me know. Thanks.
RD
The key issue here is that the CategoryAxis property underneath the Summary Table class is a GET of this visual's object of the GroupByAxis class. You can see this by using the print command and getting information about the object:
print mySummaryTable.CategoryAxis
results in my Spotfire example:
<Spotfire.Dxp.Application.Visuals.GroupByAxis object at 0x000000000000002C [Spotfire.Dxp.Application.Visuals.GroupByAxis]>
You were actually quite close though. In order to set the CategoryAxis you need to set the Expression property of the CategoryAxis like so:
from Spotfire.Dxp.Application.Visuals import SummaryTable
mySummaryTable = myVisual.As[SummaryTable]()
mySummaryTable.CategoryAxis.Expression = "<[COLUMN]>"
If you need to pass an actual column name into that rather than hardcoded, I would concatenate the expression syntax and set the Expression equal to that variable:
myColumnExp = "<[" + myColumnName + "]>"
mySummaryTable.CategoryAxis.Expression = myColumnExp
Please let me know if you need any clarity regarding this. My Spotfire version for this answer is v6.5.2.26 and my API information from https://docs.tibco.com/pub/doc_remote/spotfire/6.5.0/api/Index.aspx
Background: Project is a Data Import utility for importing data from tsv files into a EF5 DB through DbContext.
Problem: I need to do a lookup for ForeignKeys while doing the import. I have a way to do that but the retrieval if the ID is not functioning.
So I have a TSV file example will be
Code Name MyFKTableId
codevalue namevalue select * from MyFKTable where Code = 'SE'
So when I process the file and Find a '...Id' column I know I need to do a lookup to find the FK The '...' is always the entity type so this is super simple. The problem I have is that I don't have access to the properties of the results of foundEntity
string childEntity = column.Substring(0, column.Length - 2);
DbEntityEntry recordType = myContext.Entry(childEntity.GetEntityOfReflectedType());
DbSqlQuery foundEntity = myContext.Set(recordType.Entity.GetType()).SqlQuery(dr[column])
Any suggestion would be appreciated. I need to keep this generic so we can't use known type casting. The Id Property accessible from IBaseEntity so I can cast that, but all other entity types must be not be fixed
Note: The SQL in the MyFKTableId value is not a requirement. If there is a better option allowing to get away from SqlQuery() I would be open to suggestions.
SOLVED:
Ok What I did was create a Class called IdClass that only has a Guid Property for Id. Modified my sql to only return the Id. Then implemented the SqlQuery(sql) call on the Database rather than the Set([Type]).SqlQuery(sql) like so.
IdClass x = ImportFactory.AuthoringContext.Database.SqlQuery<IdClass>(sql).FirstOrDefault();
SOLVED:
Ok What I did was create a Class called IdClass that only has a Guid Property for Id. Modified my sql to only return the Id. Then implemented the SqlQuery(sql) call on the Database rather than the Set([Type]).SqlQuery(sql) like so.
IdClass x = ImportFactory.AuthoringContext.Database.SqlQuery<IdClass>(sql).FirstOrDefault();
Say I have a stored procedure that returns dataSet from 2 different tables. Example:
SELECT Customers.FirstName, Customers.LastName, SUM(Sales.SaleAmount) AS SalesPerCustomer
FROM Customers LEFT JOIN Sales
ON Customers.CustomerID = Sales.CustomerID
GROUP BY Customers.FirstName, Customers.LastName
Is there any way to get a strongly typed list as a result from this stored procedure ? Something like this:
StoredProcedure sp = myDevDB.GetCustomerSales();
List<MyCustomType> resultSet = sp.ExecuteTypedList<MyCustomType>();
How and where do I define the MyCustomType class ? How do I map its properties to the actual table columns ?
thanks,mehul
I solved it by creating a class (in the same place as all my other classes, but I didn't extend IActiveRecord, it's just a vanilla class).
Make sure the property names have exactly the same name and data type as the ones in the procedure, then call db.sproc(params).ExecuteTypedList().AsQueryable(); and it populated fine.