c# - NHibernate doesn't update many-to-many join table -

i have 3 tables @ database: images, imagetags, tags. images , tags have many-to-many relationship via imagestags table. images entity:

public class image {     public virtual int id { get; set; }     public virtual string name { get; set; }     public virtual ilist<tag> tags { get; set; } } 

tags entity:

public class tag {     public virtual int id { get; set; }     public virtual string name { get; set; } } 

images map:

public imagemap() {     table("images");     id(x => x.id).generatedby.identity();     map(m => m.name).length(100).not.nullable();      hasmanytomany(f => f.tags).table("imagetags")        .lazyload().inverse().cascade.saveupdate();  } 

tags map:

public tagmap() {     table("tags");     id(x => x.id).generatedby.identity();     map(m => m.name).length(100).not.nullable(); } 

when i'm trying update image, join table imagestag doesn't update, other image properties (name) updates.

    public void update (image image)     {         session.saveorupdate(image);         session.flush();     } 

looking help, how update join table.

the problem in mapping, explicitly in .inverse() setting

public imagemap() {     ...     hasmanytomany(f => f.tags)        .table("imagetags")        .lazyload()        .inverse()         // wrong, remove        .cascade.saveupdate();  } 

why? setting there cases, when mapp both ends, e.g. if on tag side:

public tagmap() {     ...     hasmanytomany(f => f.images)        .... } 

in case, have both ends, mapped, , must instruct nhibernate, end master. in fact, setting .inverse() - set slave

so, because in our case, not have other end managing pairing table... cannot use inverse setting. that's it. remove it, nhibernate behave we'd expect