如何对自有类型使用自定义名称约定？

Question

public class ProcessInitialization
{
    public Guid CorrelationId { get; set; }
    public MyProcessContext ProcessContext { get; set; }
}

public class MyProcessContext
{
    public int? ProcessId { get; set; }
}

没有使用我的约定，我得到了

SELECT `process`.`CorrelationId`
FROM `ProcessInitialization` AS `process`
WHERE `process`.`ProcessContext_ProcessId` = 8

我的惯例是 snake_case 从 PascalCase:

public static void SetSimpleUnderscoreTableNameConvention(this ModelBuilder modelBuilder,
    bool preserveAcronyms,
    IDictionary<string, string> propertyMap = null,
    IDictionary<string, string> entityMap = null
    )
{
    var propMap = propertyMap ?? new Dictionary<string, string>();
    var entMap = entityMap ?? new Dictionary<string, string>();

    foreach (var entity in modelBuilder.Model.GetEntityTypes())
    {
        foreach (var prop in entity.GetProperties())
        {
            if (propMap.ContainsKey(prop.Name))
            {
                prop.Relational().ColumnName = propMap[prop.Name];
            }
            else
            {
                var underscoredProp = AddUndercoresToSentence(prop.Name, preserveAcronyms);
                prop.Relational().ColumnName = underscoredProp.ToLowerInvariant();
            }
        }

        var entName = entity.DisplayName();

        if (entMap.ContainsKey(entName))
        {
            entity.Relational().TableName = entMap[entName];
        }
        else
        {
            var underscored = AddUndercoresToSentence(entity.DisplayName(), preserveAcronyms);
            entity.Relational().TableName = underscored.ToLowerInvariant();
        }
    }
}

使用它查询无效：

SELECT `process`.`correlation_id`
FROM `process`
LEFT JOIN `process_initialization._process_context#_my_process_context` AS `process.ProcessContext` ON `process`.`correlation_id` = `process.ProcessContext`.`process_initialization_correlation_id`
WHERE `process.ProcessContext`.`process_id` = 8

看来我不需要将我的转换应用于某些 entity:

var underscored = AddUndercoresToSentence(entity.DisplayName(), preserveAcronyms);
if (underscored.Contains("#")) // any other way to understand it is special?
    continue;
entity.Relational().TableName = underscored.ToLowerInvariant();

之后我得到：

The keys {'ProcessInitializationCorrelationId'} on 'ProcessInitialization.ProcessContext#MyProcessContext' and {'CorrelationId'} on 'ProcessInitialization' are both mapped to 'process_initialization.PK_process_initialization' but with different columns ({'process_initialization_correlation_id'} and {'correlation_id'}).

Answer 1

拥有的类型需要特殊处理。

首先，您使用IEntityType.IsOwned()方法识别它们。

然后，当拥有实体类型时，您应该跳过 table 名称映射（因为它们与根所有者实体共享相同的 table）。拥有的类型还具有应该跳过的阴影 PK 属性，对于其他属性，您应该从根所有者到拥有的类型的路径构建列名称。所有者信息可通过 IEntityType.

的 DefiningEntityType 和 DefiningNavigationName 属性访问

将所有这些应用到您的代码中：

foreach (var entity in modelBuilder.Model.GetEntityTypes())
{
    foreach (var prop in entity.GetProperties())
    {
        if (entity.IsOwned() && prop.IsPrimaryKey()) continue;
        IEntityType propOwner = entity;
        string propName = prop.Name, columnName = null;
        do
        {
            if (!propMap.TryGetValue(propName, out var name))
                name = AddUndercoresToSentence(propName, preserveAcronyms).ToLowerInvariant();
            columnName = columnName == null ? name : name + "_" + columnName;
            propName = propOwner.DefiningNavigationName;
            propOwner = propOwner.DefiningEntityType;
        }
        while (propName != null);
        prop.Relational().ColumnName = columnName;
    }

    if (entity.IsOwned()) continue;
    var entName = entity.DisplayName();
    if (!entMap.TryGetValue(entName, out var tableName))
        tableName = AddUndercoresToSentence(entName, preserveAcronyms).ToLowerInvariant();
    entity.Relational().TableName = tableName;
}

如何对自有类型使用自定义名称约定？

How to use custom name convention with owned types?

c#

entity-framework-core

ef-core-2.0