feathers-solr

feathers-solr

Solr Adapter for Feathersjs

Online Demo

feather-solr This demonstrate ease of a single query

Installation

npm install feathers-solr --save

Documentation

Please refer to the Feathers database adapter documentation for more details or directly at:

• Service methods - How to use a database adapter
• Pagination and Sorting - How to use pagination and sorting for the database adapter
• Querying - The common adapter querying mechanism
• Extending - How to extend a database adapter

Getting Started

Install Solr

 bin/solr start -e schemaless

Use feathers-solr/bin/install-solr.sh for a kickstart installation.

Options

Option	Default	Description
host	http://localhost:8983/solr
core	/gettingstarted
schema	false	{title: {type:"string"}}
migrate	alter	safe, alter and drop (delete all data and reset schema)
commitStrategy	{softCommit: true, commitWithin: 50000, overwrite: true}

Managed Schema

Schemaless Mode is recommended. Use Solr Field Types and Field Type Definitions and Properties to define Model properties

{
    title: {
        type: "text_general", // For more flexible searching. Default type is 'string'
        stored: true, // default, keep value visible in results
        indexed: true, // default, make it searchable
        multiValued: false, // default, true becomes an array field
    }
}

See your current schema definition

 http://localhost:8983/solr/gettingstarted/schema/

Complete Example

Here's an example of a Feathers server that uses feathers-solr.

    const feathers = require('feathers');
    const rest = require('feathers-rest');
    const hooks = require('feathers-hooks');
    const bodyParser = require('body-parser');
    const errorHandler = require('feathers-errors/handler');
    const solr = require('feathers-solr');

    const Service = feathersSolr({
        host: 'http://localhost:8983/solr',
        core: '/gettingstarted',
        schema:{
                name: 'text_general',
                company: 'text_general',
                email: 'text_general',
                age:  'int',
                gender: 'string',
                color: {
                    type: 'string',
                    multiValued: true,
                },
                address: {
                    type: 'string',
                    default: 'Düsseldorf'
                }
        },
        paginate: {
            default: 10,
            max: 4
    });

    const app = feathers()
      .configure(rest())
      .configure(hooks())
      .use(bodyParser.json())
      .use(bodyParser.urlencoded({ extended: true }))
      .use('/solr', Service())
      .use(errorHandler());


    app.listen(3030);

    console.log('Feathers app started on 127.0.0.1:3030');

Run Demo App

 node /example/app.js

Support all Feathers Queries

See Feathers querying for more detail

Supported Solr Queries

$search

Simple query

query: {
  $search: "John"
}

'$search' will try to match against Solr default search field 'text' Schemaless Mode

More complex query with a default Solr configuration.

query: {
  
  $search: "John !Doe +age:[80 TO *]", // Search in default field _text_. See Solr copy field `copy:* to _text_`
  // $params: {
  //   qf: "name^10 friends" define explicit fields to query and boost
  // }
  // or $search: "name:John^10 AND !name:Doe AND age:[80 TO *]", 
  // or $search: "joh*", 
  // or $search: '"john doe"', 
  // or $search: '"john doe"', 
  // or $search: 'jon', 
  
}

$params

Add all kind of Solr query params! Combine huge Solr Features like facets, stats, ranges, grouping and more with the default response. This example will group the result.

query: {
    $params: {
        group : true,
        "group.field" : "country",
        "group.format" : "simple",
    }
}

Feathers Rest query

http://localhost:3030/solr?$params[group]=true&$params[group.field]=gender&$params[group.field]=age&$params[group.limit]=1&$params[group.format]=grouped&$select=id,age,gender

Feathers Result

{
  "QTime": 0,
  "total": 0,
  "limit": 10,
  "skip": 0,
  "data": {
    "gender": {
      "matches": 50,
      "groups": [
        {
          "groupValue": "male",
          "doclist": {
            "numFound": 24,
            "start": 0,
            "docs": [
              {
                "id": "59501959f2786e0207a8b29f",
                "age": "45",
                "gender": "male"
              }
            ]
          }
        },
        {
          "groupValue": "female",
          "doclist": {
            "numFound": 26,
            "start": 0,
            "docs": [
              {
                "id": "595019590a8632fecd292592",
                "age": "51",
                "gender": "female"
              }
            ]
          }
        }
      ]
    },
    "age": {
      "matches": 50,
      "groups": [
        {
          "groupValue": "45",
          "doclist": {
            "numFound": 3,
            "start": 0,
            "docs": [
              {
                "id": "59501959f2786e0207a8b29f",
                "age": "45",
                "gender": "male"
              }
            ]
          }
        },
        {
          "groupValue": "51",
          "doclist": {
            "numFound": 2,
            "start": 0,
            "docs": [
              {
                "id": "595019590a8632fecd292592",
                "age": "51",
                "gender": "female"
              }
            ]
          }
        }
      ]
    }
  }
}

$facet Functions and Analytics

See Solr Facet Functions and Analytics

Aggregation	Example	Effect
sum	sum(sales)	summation of numeric values
avg	avg(popularity)	average of numeric values
sumsq	sumsq(rent)	sum of squares
min	min(salary)	minimum value
max	max(mul(price,popularity))	maximum value
unique	unique(state)	number of unique values (count distinct)
hll	hll(state)	number of unique values using the HyperLogLog algorithm
percentile	percentile(salary,50,75,99,99.9)	calculates percentiles

query: {
    $facet: {
        age_avg : "avg(age)",
        age_sum : "sum(age)"
    }
}

$facet Ranges

Add a facet type range

query: {
    $facet: {
        age_ranges: {
            type: "range",
            field: "age",
            start: 0,
            end: 100,
            gap: 25
        }
    }
}

Feathers Rest query

http://localhost:3030/solr?&$facet[age_ranges][type]=range&$facet[age_ranges][field]=age&$facet[age_ranges][start]=0&$facet[age_ranges][end]=100&$facet[age_ranges][gap]=25&$facet[age_avg]=avg(age)&$facet[age_sum]=sum(age)

Feathers Result

{
    QTime: 0,
    total: 50,
    limit: 10,
    skip: 0,
    data: [...],
    facet: {
        age_avg: 29.44,
        age_sum: 1472,
        count: 54,
        age_ranges: {
            buckets: [{
                val: 0,
                count: 4
            }, {
                val: 25,
                count: 17
            }, {
                val: 50,
                count: 15
            }, {
                val: 75,
                count: 14
            }]
        }
    }
}

See more query variants JSON Facet API,Solr Facet Functions and Analytics, Solr Subfacets, Multi-Select Faceting

$suggest

A custom response object for autocompleter suggestions. See example app.js for creating a custom searchcomponent and requesthandler including a spellcheck component

query: {
    $suggest: 'Handmake',
    $params: {} // to plain solr parameter
}

Feathers Rest query

http://localhost:3030/solr?&$suggest=Handmake

Feathers Result This is a plain solr response

{
    {
        "responseHeader": {
            "status": 0,
            "QTime": 1
        },
        "spellcheck": {
            "suggestions": [
                "handmake", {
                    "numFound": 1,
                    "startOffset": 0,
                    "endOffset": 8,
                    "origFreq": 0,
                    "suggestion": [{
                        "word": "handmade",
                        "freq": 1
                    }]
                }
            ],
            "correctlySpelled": false,
            "collations": [
                "collation",
                "handmade"
            ]
        },
        "suggest": {
            "suggest": {
                "Handmake": {
                    "numFound": 1,
                    "suggestions": [{
                        "term": "Handmade Wooden Keyboard",
                        "weight": 0,
                        "payload": ""
                    }]
                }
            }
        }
    }
}

$spellcheck

This feature add a spellcheck component to the default find result

query: {
    $search: "Handmake",
    $spellcheck:1,
    color: "sky blue",
    $limit: 10,

}

Feathers Rest query

http://localhost:3030/solr?$search=Handmake&color=Handmke&color="sky blue"&$limit=10&$spellcheck

Feathers Result

{
    "QTime": 0,
    "total": 6,
    "limit": 10,
    "skip": 0,
    "data": [...],
    "spellcheck": {
            "suggestions": [
                "handmake", {
                    "numFound": 1,
                    "startOffset": 0,
                    "endOffset": 8,
                    "origFreq": 0,
                    "suggestion": [{
                        "word": "handmade",
                        "freq": 1
                    }]
                }
            ],
            "correctlySpelled": false,
            "collations": [
                "collation",
                "handmade"
            ]
        },

Additional Client Methods

Solr Api's	Returns a Promise	./client/requestHandler/
Solr BolbStore API		BlobStoreApi.js
Solr Collections API	Adapter.client().collections.method	CollectionsApi.js
Config API		ConfigApi.js
Solr ConfigSets API	Adapter.client().configSets.method	ConfigSetsApi.js
CoreAdmin API	Adapter.client().coreAdmin.method	CoreAdminApi.js
JSON Request API	Used by Adapter .find() .get()	JsonRequestApi.js
Solr Managed Resources	Adapter.client().resources.method	ManagedResources.js
Parallel SQL Interface		ParalellSQL.js
Ping	Adapter.client().ping()	Ping.js
RealTime Get		RealTime.js
ReplicationHandlers		ReplicationHandlers.js
Request Parameters API	Adapter.client().requestParameters.method	RequestParametersAPI.js
Schema API	Adapter.client().schema.method	SchemaApi.js
SearchHandlers	Adapter.client().search()	SearchHandlers.js
ShardHandlers		ShardHandlers.js
Update	Used by Adapter .create(), .update() and .patch()	UpdateRequestHandlers.js

Not all Solr API's implemented at the moment

TODO

• Write more Tests
• Write more Docs
• Implement $suggest and $spellcheck
• Add demo autocompleter with suggestions.
• Add demo search page with facet navigation, filter(ranges, sliders), pagination and result listing by just one query.

Changelog

0.1.5

• Add $suggest feature 0.1.4 0.1.3

• Initial release

License

Copyright (c) 2015

Licensed under the MIT license.