AntiStupidUnderscoreIDEntityFramework.cs

    /// <summary>
    /// Provides a convention for fixing the independent association (IA) foreign key column names. (prevents EF from adding _Id)
    /// </summary>
    public class ForeignKeyNamingConvention : IStoreModelConvention<AssociationType>
    {
        public void Apply(AssociationType association, DbModel model)
        {
            // Identify a ForeignKey properties (including IAs)
            if (association.IsForeignKey)
            {
                // rename FK columns
                var constraint = association.Constraint;
                if (DoPropertiesHaveDefaultNames(constraint.FromProperties, constraint.ToRole.Name, constraint.ToProperties))
                {
                    NormalizeForeignKeyProperties(constraint.FromProperties);
                }
                if (DoPropertiesHaveDefaultNames(constraint.ToProperties, constraint.FromRole.Name, constraint.FromProperties))
                {
                    NormalizeForeignKeyProperties(constraint.ToProperties);
                }
            }
        }

        private bool DoPropertiesHaveDefaultNames(ReadOnlyMetadataCollection<EdmProperty> properties, string roleName, ReadOnlyMetadataCollection<EdmProperty> otherEndProperties)
        {
            if (properties.Count != otherEndProperties.Count)
            {
                return false;
            }

            for (int i = 0; i < properties.Count; ++i)
            {
                if (!properties[i].Name.EndsWith("_" + otherEndProperties[i].Name))
                {
                    return false;
                }
            }
            return true;
        }

        private void NormalizeForeignKeyProperties(ReadOnlyMetadataCollection<EdmProperty> properties)
        {
            for (int i = 0; i < properties.Count; ++i)
            {
                string defaultPropertyName = properties[i].Name;
                int ichUnderscore = defaultPropertyName.IndexOf('_');
                if (ichUnderscore <= 0)
                {
                    continue;
                }
                string navigationPropertyName = defaultPropertyName.Substring(0, ichUnderscore);
                string targetKey = defaultPropertyName.Substring(ichUnderscore + 1);

                string newPropertyName;
                if (targetKey.StartsWith(navigationPropertyName))
                {
                    newPropertyName = targetKey;
                }
                else
                {
                    newPropertyName = navigationPropertyName + targetKey;
                }
                properties[i].Name = newPropertyName;
            }
        }

    }