python - SQLAlchemy Primary Key from Unique and Primary Foreign Keys -


i have 2 tables, reports , bids, 1 many relationship report can have multiple bids. simplified report looks this:

class report(base):     __tablename__ = 'reports'      dr_nbr = column(char(14), primary_key=true)     header_trade = column(varchar(255), unique=true)     bids = relationship("biddetail", lazy="dynamic")

the bids table looks this:

class biddetail(base):     __tablename__ = 'bids'      report_id = column(char(14), primary_key=true)     report_header_trade = column(varchar(255), primary_key=true)     __table_args__ = (foreignkeyconstraint(                             [report_id, report_header_trade],                             [report.dr_nbr, report.header_trade]),                      {})

i have tried few ways import 2 keys reports , use primary keys. know when use primary foreign keys table need define foreignkeyconstraint, when 1 foreign key primary , unique doesn't work. thing i've tried (by researching similar questions on so) passing 2 fields foreign keys __table_args__ uniqueconstraint, i'm not sure i'm doing , doesn't work.

how import 2 foreign keys in sqlalchemy 1 primary key , other has unique constraint?

thanks @ilja-everilä answering question in comments. right way define tables is:

class report(base): __tablename__ = 'reports'  dr_nbr = column(char(14), primary_key=true) header_trade = column(varchar(255)) __table_args__ = (uniqueconstraint(dr_nbr, header_trade),) contacts = relationship(                 'contact',                 secondary='report_contact_link' ) bids = relationship("biddetail", lazy="dynamic")  class biddetail(base): __tablename__ = 'bids'  report_id = column(char(14), primary_key=true) report_header_trade = column(varchar(255), primary_key=true) __table_args__ = (foreignkeyconstraint(                         [report_id, report_header_trade],                         [report.dr_nbr, report.header_trade]),                  {})

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