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https://github.com/bluehalo/mongoose-query-service

NPM module to provide shareable services and plugins for Mongoose models
https://github.com/bluehalo/mongoose-query-service

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NPM module to provide shareable services and plugins for Mongoose models

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# @asymmetrik/mongoose-query-service



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> NPM module to provide common services and plugins for Mongoose models



## Table of Contents



- [Use](#use)

- [Install](#install)

- [Usage](#usage)

- [API](#api)

- [Contribute](#contribute)

- [License](#license)



## Use

`@asymmetrik/mongoose-query-service` provides utility services for creating and executing Mongoose queries based on a simple input search object. Additionally, it provides several plugins (`pageable` and `gettable`) that can be applied to Mongoose Schemas to allow them to add functionality to those Mongoose Schemas.



## Install



Include this module as a dependency of your application in the `package.json` file. For example:

```

{

  ...

  dependencies: {

    "@asymmetrik/mongoose-query-service": "latest"

  }

  ...

}

```



## Usage



Include the module via `require` wherever applicable:

```

var mongooseQueryService = require('@asymmetrik/mongoose-query-service');

```



### Plugins



Apply any of the plugins to a Mongoose model using the `.plugin(...)` method provided by Mongoose. For example:

```

var Person = new Schema({});

Person.plugin(mongooseQueryService.plugins.pageable);

```



### Services



Service methods are available from the base `@asymmetrik/mongoose-query-service` module, and can be called directly with the parameters defined in the API below.



## API



### Plugins



The following plugins are available at the top level `plugins` attribute:



#### pageable



Applying the `pageable` plugin at `mongooseQueryService.plugins.pageable` adds a static method to Mongoose model called `pagingSearch` that takes an input object parameter with the following attributes:



Attribute | Optional? | Default | Description

------------ | ------------- | ------------ | -------------

query | Yes | `{}` | Filters to pass to the Mongo query

projection | Yes | `{}` | Attributes to return in the elements

options | Yes | `{}` | Query options specified by Mongoose

searchTerms | Yes | null | String of search terms that will be translated into a search on the text index for the model

populate | Yes | null | Populate options specified by Mongoose

sorting | Yes | {} | Attributes for sorting and directions of each sort. Defaults to descending sort. Accepts either an object with a standard Mongo sorting config or an array of objects with `property` and `direction` attributes that will be translated into the standard Mongo sorting config.

page | Yes | 0 | To support paged searches, combines with `limit` to set the `skip` attribute of the Mongo query. If `limit` is not provided, `page` is not used.

limit | Yes | null | If provided, returns up to this number of results. Combines with the `page` parameter when setting the `skip` attribute of the Mongo query



The `pagingSearch` method returns a Promise resolved with an object with the following attributes:



Attribute | Type | Description

------------ | ------------- | ------------

hasMore | Boolean | Indicates if more documents are available if the next page of results is queried

totalSize | Number | The total count of documents that passed the query filter

pageNumber | Number | The current page of results returned. `0` if not paging

pageSize | Number | The current size of each page returned. Set to the input `limit` value (if provided) or the actual size

totalPages | Number | The number of pages from the the total size and page size configuration

elements | Array | The results that were found matching the current page.



*Example:*

```

var Person = new Schema({});

Person.plugin(mongooseQuerySchema.plugins.pageable);

```



#### gettable



Applying the `gettable` plugin at `mongooseQueryService.plugins.gettable` sets the `toObject` and `toJSON` attributes of the Mongoose Schema to `{ getters: true }` so that any `get` method defined in a Schema Type is used when the `toObject` or `toJSON` methods are invoked on the Mongoose model.



*Example:*

```

var Person = new Schema({});

Person.plugin(mongooseQuerySchema.plugins.gettable);

```



### Services



#### buildQuery(query, pagingParameters)



Converts input query and paging parameters into a pageable query object to be used with the `pageable` plugin's `pagingSearch` function.



Returns a promise resolved with the resulting search config object with the attributes:



Attribute | Type | Description

------------ | ------------- | ------------

query | Boolean | Indicates if more documents are available if the next page of results is queried

sorting | Object | If a `sort` attribute of `pagingParameters` is set, builds a sorting object with a direction set by the `dir` attribute (defaulting to -1 for descending, or set by 'DESC' or 'ASC').

page | Number | Set by the input `page` attribute of `pagingParameters` passed into the `getPage` method

limit | Number | Set by the input `size` attribute of `pagingParameters` passed into the `getLimit` method



#### validateNonEmpty

Returns true of the input value is not empty (using the lodash *isEmpty* function)



#### parseDate

Parse an input as a date. Handles various types of inputs, such as Strings, Date objects, and Numbers.



@param {date} The input representing a date / timestamp



@returns The timestamp in milliseconds since the Unix epoch



#### getLimit

Get the limit provided by the input query parameters, if there is one. Limit is taken from the `size` attribute of the input `queryParams` object. Limit has to be at least 1 with a default value of 20 and no more than the max value.



@param queryParams



@param maxSize (optional) default: 100



@returns {number}



#### getPage

Page needs to be positive and has no upper bound. Taken from the `page` attribute of the input `queryParams` object. Defaults to 0.



@param queryParams



@returns {number}



#### contains

Determine if an array contains a given element by doing a deep comparison.



@param arr



@param element



@returns {boolean} True if the array contains the given element, false otherwise.



#### toMongoose

Converts an input Mongo query, possibly with $date and $obj attributes, to a query that Mongoose supports with Date and ObjectId objects mapped from those inputs as appropriate.



@param obj



@returns {object}



## Contribute



PRs accepted.



## License



See LICENSE for details