Bookshelf.js join multiple tables - postgresql

Question

I have multple models in bookself:
User (id, username)
Team (id, name)
Skill (id, name)
TeamSkill (id, skill_id, team_id)
TeamSkillUpvote (id, team_skill_id, user_id)
I would like to make this kind of query:
select team.id, team.name, team_skill_upvotes.user_id
from skill, team_skills, team
where skill.id = <THE_ID_OF_MY_MODEL>
and skill.id = team_skills.skill_id
and team_skills.team_id = team.id
and team_skills.id = team_skill_upvotes.team_skill_id
Anyone can help?
Thanks!

Answer 1

After searching I found the answer...It is built in a few steps:
1: Define relations for the TeamSkill:
export interface ITeamSkillRelations {
team: Team;
upvotes: Collection<TeamSkillUpvote>;
}
export class TeamSkill extends bookshelf.Model<TeamSkill>{
...
public relations: ITeamSkillRelations;
public upvotes(): Collection<TeamSkillUpvote> {
return this.hasMany(TeamSkillUpvote, TeamSkillUpvote.teamSkillIdAttribute/*team_skill_id*/);
}
public team(): Team {
return this.belongsTo(Team, TeamSkill.teamIdAttribute/*team_id*/);
}
...
}
2: The magic:
export class Skill extends bookshelf.Model<Skill> {
public getTeams(): Promise<ITeamOfASkill[]> {
var fetchOptions: CollectionFetchOptions = {
withRelated: [
TeamSkill.relatedTeamSkillUpvotesAttribute/*upvotes*/,
TeamSkill.relatedTeamAttribute/*team*/
]
};
return this.teamSkills()
.fetch(fetchOptions)
.then((teamSkillsCollection: Collection<TeamSkill>) => {
var teamSkills: TeamSkill[] = teamSkillsCollection.toArray();
return _.map(teamSkills, _skill => this._convertTeamSkillToTeamOfASkill(_skill));
});
}
private _convertTeamSkillToTeamOfASkill(teamSkill: TeamSkill): ITeamOfASkill {
var team: Team = teamSkill.relations.team;
var upvotesCollection: Collection<TeamSkillUpvote> = teamSkill.relations.upvotes;
var upvotes: TeamSkillUpvote[] = upvotesCollection.toArray();
var upvotingIds =
_.map(upvotes, _ => _.attributes.user_id);
return {
team: team,
upvotingUserIds: upvotingIds
};
}
}