Plugin for closp providing generation of crud modules
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README.md

closp-crud

This projet is deprecated and integrated directly within https://github.com/sveri/closp

A Leiningen plugin to provide CRUD functionality for clojure web projects. Optimized for the usage within https://github.com/sveri/closp.

Rationale

I find it tedious to create a lot of stuff manually like most developers do. And some day while playing around with clojure web stuff it occured to me that I need some kind of CRUD functionality again and again.

That's why I started closp-crud. It's the first release and does not contain much functionality. However, it should be enough to get going with a very basic UI.

Disclaimer

I only did some basic tests. Given the fact that there are many million differnt ways this library can be used, please be aware that there will be bugs and missing functionality. I am happy about either, bug reports or pull requests. Also suggestions of any kind are welcome.

Usage

There are two ways to use closp-crud. First, you can use it standalone or second as part of closp which it comes integrated with.

As part of closp

You need a table definition in a file somewhere. It may look like this:

; closp-definitions/person.edn
{:name    "person"
 :columns [{:name "id" :type :int :null false :pk true :autoinc true}
           {:name "first_name" :type :varchar :max-length 30}
           {:name "last_name" :type :varchar :max-length 30}
           {:name "role" :type :varchar :max-length 30}
           {:name "email" :type :varchar :max-length 30 :null false :unique true}]}

Then run

$ lein run -m de.sveri.clospcrud.closp-crud/closp-crud -f closp-definitions/person.edn

This will generate several files:

  • Up and down file in ./migrations containing the SQL code to create and drop a person table.
  • A database clj source file in de/sveri/siwf/db/person.clj containing the source to do CRUD operations on the person table using korma
  • A routes clj source file in de/sveri/siwf/routes/person.clj containing the route definitions using compojure and noir.
  • Several html files containing three templates: index.html, create.html and delete.html

Finally you need to add the generated routes definition (person-routes) from routes/person.clj to your handler in ns.handler in the get-handler function under ;; add your application routes here.

Options

  • -f Mandatory The path to the table definition file.

Dependencies

This plugin only works if the following libraries exist in your classpath:

  • lib-noir
  • compojure
  • timbre
  • korma
  • plumatic/schema

Prerequisites

closp-crud expects a layout namespace containing a render function. This will be used to render the templates and can be configured via the project settings. closp provides a template here: https://github.com/sveri/closp/blob/master/resources/leiningen/new/closp/clj/layout.clj

closp-crud.edn options

closp-crud expects a closp-crud.edn file in your resources path. It expects several keys there, namely:

:jdbc-url

This is the jdbc uri that closp-crud will use to create the SQL files. This must be an accessible database. You cannot provide fake uris here.

This will create a h2 database in memory.

:jdbc-url "jdbc:h2:mem:test_mem"

:migrations-output-path

The path where the generated SQL files will be stored. Can be anywhere, but should be somewhere where a migration library can pick it up.

Example:

:migrations-output-path "./migrations"

:clj-src

The file path to your projects clj source files. Should be relativ to the current project.

Example:

:clj-src "src/clj"

:ns-db

The namespace where generated db functions will be written to.

Example:

:ns-db "de.sveri.siwf.db"    

:ns-db-entities

The namespace where generated db entity declaration will be put.

Example:

:ns-db-entities "de.sveri.siwf.db.entities"

:ns-routes

The namespace where the generated routes will be written to.

Example:

:ns-routes "de.sveri.siwf.routes"

:ns-layout

The namespace where your layout.clj with a given render function resides.

Example:

:ns-layout "de.sveri.siwf.layout"

:templates

A file path where the generated html templates will be stored

Example:

:templates "resources/templates"

Table Definition

Table definitions are stored in edn files whereas one definition has to be in one file. Multiple definitions per file are not supported.

Example:

{:name    "person"
 :columns [{:name "id" :type :int :null false :pk true :autoinc true}
          {:name "first_name" :type :varchar :max-length 30}
          {:name "last_name" :type :varchar :max-length 30}
          {:name "role" :type :varchar :max-length 30}
          {:name "email" :type :varchar :max-length 30 :null false :unique true}]}

Structure

Two key / value pairs are expected:

  • :name The name of the entity
  • :columns A vector of maps containing the description for each single column in the table.

Column definitions

The structure of the columns is somewhat flexible.

  • Mandatory :name - The name of the column

  • Mandatory :type - The type of the column wih can be one of the following: :int :varchar :boolean :text :time :date :char :binary :smallint :bigint :decimal :float :double :real :timestamp If you choose a :char or :varchar type it makes sense to add the :max-length option to the map.

  • Optional :null Bool :max-length Num :required Bool :pk Bool :autoinc Bool :unique Bool :default s/Any

Examples:

  • {:name "id" :type :int :null false :pk true :autoinc true} creates a primary key named "id" of type "int" which will autoincrement
  • {:name "age" :type :int :null false} creates an "age" column of type "int" which cannot be null
  • {:name "male" :tpye :boolean :default true} creates a "male" column of type "boolean" which defaults to true and can be null.

For a complete reference of supported tags please look at: http://www.liquibase.org/documentation/column.html

FAQ

Using h2 I get an error it cannot find columns or tables

This is due to the fact the h2 sticks to the SQL standards and some others don't.
TLDR: add ;DATABASE_TO_UPPER=FALSE to your database uris like this: "jdbc:h2:./db/korma.db;DATABASE_TO_UPPER=FALSE"

Long version is the SQL standards and this SO post: http://stackoverflow.com/questions/10789994/make-h2-treat-quoted-name-and-unquoted-name-as-the-same

Standalone

Deprecated I will still work standalone, but the documentation is not up to date. For a complete example look at: http://github.com/sveri/closp

Please be aware that closp-crud is tied to closp. It is possible to run it standalone, but expects a certain structure, some dependencies and existing functions to call.

Put [de.sveri/closp-crud "0.2.1"] into the :dependencies vector of your project.clj file.

Then add the configuration to your project.clj file like this (see below for explanation of options):

:closp-crud {:jdbc-url "jdbc:h2:mem:test_mem"
             :migrations-output-path "./migrations"
             :clj-src "src/clj"
             :ns-db "de.sveri.siwf.db"
             :ns-routes "de.sveri.siwf.routes"
             :ns-layout "de.sveri.siwf.layout"
             :templates "resources/templates"}

Next you need a table definition in a file somewhere. It may look like this:

; closp-definitions/person.edn
{:name    "person"
 :columns [[:id :int :null false :pk true :autoinc true]
           [:name [:varchar 40] :null false]
           [:age :int :null false]
           [:male :boolean :default true]]}

Then run

$ lein run -m de.sveri.clospcrud.closp-crud/closp-crud -f closp-definitions/person.edn

This will generate several files:

  • Up and down file in ./migrations containing the SQL code to create and drop a person table.
  • A database clj source file in de/sveri/siwf/db/person.clj containing the source to do CRUD operations on the person table using korma
  • A routes clj source file in de/sveri/siwf/routes/person.clj containing the route definitions using compojure and noir.
  • Several html files containing three templates: index.html, create.html and delete.html

Finally you need to add the generated routes definition from routes/person.clj to your handler.

License

Copyright © 2015 Sven Richter

Distributed under the Eclipse Public License version 1.0.