Add Coded Value To Domain

• Domain management involves the following steps:

• Create the domain using the Create Domain tool.
• Add values to or set the range of values for the domain using this tool or the Set Value For Range Domain tool.
• Associate the domain with a feature class using the Assign Domain To Field tool.

• The coded value domain includes both the actual value that is stored in the database (for example, 1 for pavement) and a description of what the code value means (for example, pavement).

• A coded value domain which specifies a valid set of values for an attribute can apply to any type of attribute—text, numeric, date, and so on. For example, a coded value list for a text attribute might include valid pipe material values: CL - cast iron pipe; DL - ductile iron pipe; ACP - asbestos concrete pipe, or a coded value list might include the numeric values representing valid pipe diameters: .75–3/4"; 2–2"; 24–24"; and 30–30".

• Workspace domains can also be managed in ArcCatalog or the Catalog window. Domains can be created and modified through the Domains tab on the Database Properties dialog box.

The following Python window script demonstrates how to use the AddCodedValueToDomain function in immediate mode.

import arcpy
arcpy.env.workspace = "C:/data"
arcpy.AddCodedValueToDomain_management("montgomery.gdb", "material", "1", "PVC")

                    

This stand-alone script uses the AddCodedValueToDomain function as part of a workflow to create an attribute domain and give it values.

# Name: MakeDomain.py
# Description: Create an attribute domain to constrain pipe material values
 
# Import system modules
import arcpy
 
# Set the workspace (to avoid having to type in the full path to the data every time)
arcpy.env.workspace = "C:/data"
 
# Set local parameters
domName = "Material4"
gdb = "montgomery.gdb"
inFeatures = "Montgomery.gdb/Water/Distribmains"
inField = "Material"
 
# Process: Create the coded value domain
arcpy.CreateDomain_management("montgomery.gdb", domName, "Valid pipe materials", 
                              "TEXT", "CODED")

# Store all the domain values in a dictionary with the domain code as the "key" 
# and the domain description as the "value" (domDict[code])
domDict = {"CI":"Cast iron", "DI": "Ductile iron", "PVC": "PVC", \
           "ACP": "Asbestos concrete", "COP": "Copper"}
    
# Process: Add valid material types to the domain
# use a for loop to cycle through all the domain codes in the dictionary
for code in domDict:        
    arcpy.AddCodedValueToDomain_management(gdb, domName, code, domDict[code])
    
# Process: Constrain the material value of distribution mains
arcpy.AssignDomainToField_management(inFeatures, inField, domName)

                    

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