I have a MongoDB collection Department as documents with the following format:
{
"department_id" : 1,
"title" : "Department1",
"departmentType_id" : 11
}
{
"department_id" : 2,
"title" : "Department2",
"departmentType_id" : 12
}
{
"department_id" : 3,
"title" : "Department3",
"departmentType_id" : 13
}
{
"department_id" : 4,
"title" : "Department4",
"departmentType_id" : 14
}
{
"department_id" : 5,
"title" : "Department5",
"departmentType_id" : 15
}
{
"department_id" : 6,
"title" : "Department6",
"departmentType_id" : 16
}
{
"department_id" : 7,
"title" : "Department7",
"departmentType_id" : 17
}
I have a MongoDB collection departmentDepartmentRelationship as documents with the following format:
{
"departmentDepartmentRelationshipId" : 100,
"relationshipTitle" : "Department1 is parent of Department2",
"department1_id" : 1,//reference of department with department_id: 1
"department2_id" : 2,//reference of department with department_id: 2
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
{
"departmentDepartmentRelationshipId" : 200,
"relationshipTitle" : "Department2 is parent of Department3",
"department1_id" : 2,//reference of department with department_id: 2
"department2_id" : 3,//reference of department with department_id: 3
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
{
"departmentDepartmentRelationshipId" : 210,
"relationshipTitle" : "Department2 is parent of Department7",
"department1_id" : 2,//reference of department with department_id: 2
"department2_id" : 7,//reference of department with department_id: 7
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
{
"departmentDepartmentRelationshipId" : 300,
"relationshipTitle" : "Department3 is parent of Department4",
"department1_id" : 3,//reference of department with department_id: 3
"department2_id" : 4,//reference of department with department_id: 4
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
{
"departmentDepartmentRelationshipId" : 400,
"relationshipTitle" : "Department4 is parent of Department5",
"department1_id" : 4,//reference of department with department_id: 4
"department2_id" : 5,//reference of department with department_id: 5
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
{
"departmentDepartmentRelationshipId" : 500,
"relationshipTitle" : "Department4 is parent of Department6",
"department1_id" : 4,//reference of department with department_id: 4
"department2_id" : 6,//reference of department with department_id: 6
"rootParentDepartment_id" :1,//reference of department with department_id: 1
"rootParentDepartment_id" : 1,//reference of department with department_id: 1
}
Now my model where i define hierarchical structure is:
{
"_id" : ObjectId("60af33d948d800a1315e96f6"),
"departmentDepartmentRelationshipId" :100,
"childs" : [
{
"departmentDepartmentRelationshipId" : 200,
"childs" : [ //child could by more than one
{
"departmentDepartmentRelationshipId" : 300,
"childs" : [//child could by more than one
{
"departmentDepartmentRelationshipId" : 400,
"childs" : []
}
{
"departmentDepartmentRelationshipId" : 500,
"childs" : []
}
]
},
{
"departmentDepartmentRelationshipId" : 210,
"childs" : []
}
]
}
]
}
is it possible to fetch above hierarchical model in a single query and instead of its references i want departmentDepartmentRelationship JSON object from departmentDepartmentRelationship collection ?
i’m an absolute beginner in mongoDB , i would be very thankful if anyone can help me.