带外键的动态SQLAlchemy表名

Question

基于my previous post构建，我正致力于将SQLite数据库/数据库模式转换为SQLAlchemy。

在这里，动态生成一系列表格，并分析基因组名称。每个表都有一个对父表（参考基因组）的外键引用。我怎样才能建立外键

class Genome(DynamicName, Base): 
    """ 
    Defines database schema for the reference genome. 
    """ 
    __abstract__ = True 
    TranscriptId = Column(String, primary_key=True) 
    AnalysisA = Column(Integer) 
    child = relationship('') # how to declare dynamic name? 


class AlignedGenome(DynamicName, Base): 
    """ 
    Defines database schema for a target (aligned) genome. 
    """ 
    __abstract__ = True 
    AlignmentId = Column(String, primary_key=True) 
    TranscriptId = Column(String, ForeignKey('')) # how to declare dynamic name? 
    AnalysisZ = Column(Integer) 
    parent = relationship('') # how to declare dynamic name? 


def build_genome_table(genome, is_ref=False): 
    d = {'__tablename__': genome} 
    if is_ref is True: 
     table = type(genome, (Genome,), d) 
    else: 
     table = type(genome, (AlignedGenome,), d) 
    return table 

父和子表都通过TranscriptId关键，这是一个一对多的关系关联：许多AlignmentId s的一个TranscriptId相关。

Answer 1

在这种情况下，我认为这是更容易只是建立全班动态，而不是具体的件：

def build_genome_table(genome, is_ref=False): 
    if is_ref is True: 
     table = type(genome, (Base,), { 
      "__tablename__": genome, 
      "TranscriptId": Column(String, primary_key=True), 
      "AnalysisA": Column(Integer), 
      "child": relationship("Aligned" + genome), 
     }) 
    else: 
     table = type("Aligned" + genome, (Base,), { 
      "__tablename__": "Aligned" + genome, 
      "AlignmentId": Column(String, primary_key=True), 
      "TranscriptId": Column(String, ForeignKey(genome + ".TranscriptId")), 
      "AnalysisZ": Column(Integer), 
      "parent": relationship(genome), 
     }) 
    return table 

你只需要照顾的名字一致的方式表和类。