How to Fix 'The object 'DF____' is dependent on column ''' Error When Changing Int to Double in EF Database?

Fixing the Constraint Error: "DF______" Dependency on Changed Int to Double

When attempting to update an EF database by changing an integer column (e.g., Rating) to a double, an error may occur: "The object 'DF____' is dependent on column ''. ALTER TABLE ALTER COLUMN * failed because one or more objects access this column."

Understanding the Issue

The error indicates that there's a constraint (e.g., DF_Movies_Rating__48CFD27E) that relies on the Rating column. EF automatically creates these constraints to maintain data integrity.

Resolution

To resolve the issue, the following steps can be taken:

1. Identify the Constraint: Expand the table attributes in Object Explorer and navigate to the Constraints category to see the constraint associated with the table.
2. Remove the Constraint: Right-click the constraint and select "Delete."
3. Update the Column Type: Change the Rating column's data type from int to double.
4. Recreate the Constraint: After updating the column type, recreate the constraint to ensure data integrity.

Additional Information

• It's important to note that removing constraints can lead to data loss if not done carefully.
• Always ensure that the data in the table is backed up before making any changes to constraints.

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