seraph-resource

expose crud functions for a seraph model over http

npm install seraph-resource
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seraph-resource

creates a controller with crud methods for a seraph model.

why?

seraph gives us access to a neo4j db. seraph-model gives us models for this db. seraph-resource gives us a base controller for these models.

install

npm install seraph-resource

example

setup

var db = require('seraph')('http://localhost:7474');
var User = require('seraph-model')(db, 'user');
var resource = require('seraph-resource');

var express = require('express');
var app = express();
var Users = resource(User);

app.use(Users);
app.listen(3000);

in action

Create a new node

>> curl -d '{"name":"Jon","age":23}' http://localhost:3000/user/ -H "Content-type: application/json"
{"name":"Jon","age":23,"id":8}

Read an existing node

>> curl http://localhost:3000/user/8
{"name":"Jon","age":23,"id":8}

Update a node

>> curl -X PUT -d '{"name":"Jon Packer","age":23}' http://localhost:3000/user/8 -H "Content-type: application/json"
{"name":"Jon Packer","age":23,"id":"8"}

Delete a node

>> curl -X DELETE http://localhost:3000/user/8
OK

And more!

usage

resource(seraphModel, [options])

Creates a controller with CRUD actions implemented and routed for the given seraph model.

options

  • strictContentType: (defaults to true) - only accept application/json content types. If set to false, more abstract content types such as formdata will be parsed by connect-bodyParser as well.

Default actions

  • 'read' read a node and send as json (required params: :<model.type>)
  • 'create' create a new node
  • 'update' update a node (required params: :_id?)
  • 'update-root' update the root of a model (exclude compositions). required params: :_id?.
  • 'delete' delete a node (required params: :_id?)
  • 'rel:read' read the node's relationships (required params: :_id, :_type, :_direction)
  • 'rel:nodes' read the node's related nodes (required params: :_id, :_type, :_direction)
  • 'rel:create' create a relationship (required params: :_from, :_type, :_to

In addition, if the model has fields defined, CRUD actions are provided for each field. For example, if model.fields includes 'name', these actions are defined: 'read:name', 'create:name', 'update:name', and 'delete:name'. These all take a :<model.type> param.

**note - params are prefixed with an underscore to prevent conflict with model types

default routes

If model.type is set 'model':

GET    /model/:model                        -> 'read'
POST   /model/                              -> 'create'
PUT    /model/:_id?                         -> 'update'
PUT    /model/root/:_id?                    -> 'update-root'
DELETE /model/:_id?                         -> 'delete'
GET    /model/:_id/rel/:_type/:_direction?  -> 'rel:read'
GET    /model/:_id/rel/:_type/:_direction?/nodes -> 'rel:nodes'
POST   /model/:_from/rel/:_type/:_to        -> 'rel:create'

additionally, if fields are defined (replace 'field' with the target field below)

GET    /model/:_id/field -> 'read:field'
POST   /model/:_id/field -> 'create:field'
PUT    /model/:_id/field -> 'update:field'
DELETE /model/:_id/field -> 'delete:field'

for compositions: (replace 'comp' with the target comp name below)

GET   /model/:model/comp -> 'read:comp' (model.readComposition)
POST  /model/:_id/comp -> 'push:comp' (model.push)
PUT   /model/:_id/comp -> 'update:comp' (model.saveComposition)

**note - params are prefixed with an underscore to prevent conflict with model types

middleware groups

Resource groups each of the actions into middleware groups to make it easier for you to apply targeted middleware for actions. For more information on how the groups work, see the docs in controller.

  • 'accessors' actions that will return some data from the database
  • 'mutators' actions that will change some data in the database
  • 'relationships' actions that will work with relationships
  • 'properties' actions that will work with individual properties

express param

Each resource has a param property which can be used to resolve instances of this model when specified in express routes. For example:

example

var User = model(db, 'user');
app.param(':user', User.param);
app.get('/posts/:user', function(req, res) {
  // Because :user was defined on the route, `req.user` is now set to the user
  // specified by the id passed at that point. 
  Posts.where({user: req.user.id}, function(err, posts) {
    res.json(posts);
  });
});

complete demonstration

Server

var db = require('seraph')('http://localhost:7474');
var User = require('seraph-model')(db, 'user');
var resource = require('seraph-resource');

var express = require('express');
var app = express();

User.fields = ['name', 'age', 'country'];
var Users = resource(User);

app.use(Users);
app.listen(3000);

Create a new node

>> curl -d '{"name":"Jon","age":23}' http://localhost:3000/user/ -H "Content-type: application/json"
{"name":"Jon","age":23,"id":8}

Read an existing node

>> curl http://localhost:3000/user/8
{"name":"Jon","age":23,"id":8}

Update a node

>> curl -X PUT -d '{"name":"Jon Packer","age":23}' http://localhost:3000/user/8 -H "Content-type: application/json"
{"name":"Jon Packer","age":23,"id":"8"}

Delete a node

>> curl -X DELETE http://localhost:3000/user/8
OK

Create a relationship

>> curl -d '{"since":"2005"}' http://localhost:3000/user/8/rel/friend/6 -H "Content-type: application/json"
{"from":8,"to":6,"id":0,"type":"friend","properties":{"since":"2005"}}

Read a relationship

>> curl http://localhost:3000/user/8/rel/friend/out
[{"from":8,"to":6,"id":0,"type":"friend","properties":{"since":"2005"}}]

Create a property

>> curl -d '"Australia"' http://localhost:3000/user/8/country -H "Content-type: application/json"
{"name":"Jon","age":23,"id":8,"country":"Australia"}

Read an existing property

>> curl http://localhost:3000/user/8/country
"Australia"

Update a node

>> curl -X PUT -d '"Norway"' http://localhost:3000/user/8/country -H "Content-type: application/json"
{"name":"Jon Packer","age":23,"id":"8","country":"Norway"}

Delete a node

>> curl -X DELETE http://localhost:3000/user/8/country
{"name":"Jon Packer","age":23,"id":"8"}
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