Bookshelf.js,查询相关表

Question

我有一个类似于以下的模型:

var ScholarlyPaper = Bookshelf.Model.extend({

  tableName: 'papers',

  paragraphs: function() {
    return this.hasMany(Paragraph).through(Section);
  },

  sections: function() {
    return this.hasMany(Section);
  }

});

var Section = Bookshelf.Model.extend({

  tableName: 'sections',

  paragraphs: function() {
    return this.hasMany(Paragraph);
  }

  scholarlyPaper: function() {
    return this.belongsTo(ScholarlyPaper);
  }

});

var Paragraph = Bookshelf.Model.extend({

  tableName: 'paragraphs',

  section: function() {
    return this.belongsTo(Section);
  },

  scholarlyPaper: function() {
    return this.belongsTo(ScholarlyPaper).through(Section);
  },

  author: function() {
    return this.belongsTo(Author);
  }

});

var Author = Bookshelf.Model.extend({

  tableName: 'authors',

  paragraphs: function() {
    return this.hasMany(Paragraph);
  }

});

使用Bookshelf.js,给定一个学术论文ID和作者ID,我如何得到论文中作者没有写一个段落的所有部分？

我面临的特殊挑战是我没有办法在相关的表上添加where子句(例如'where paragraphs.author_id!= author_id).

Answer 1

function(authorId, paperId, success, failure) {
  new ScholarlyPaper({id: paperId}).load({sections: function(qb) {
    qb.whereNotExists(function() {
      this.from('paragraph')
        .whereRaw('paragraph.section = section.id')
        .where('paragraph.author_id', '=', authorId);
    });
  }}).then(function(paper) {
    success(paper.related('section'));
  }, failure);
};