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Theo

Thomas Anderson is a computer programmer who maintains a double life as "Neo" the hacker. - Combination of Neo and Thomas

Summary

Theo is an open-source framework written in Swift that provides an interface for interacting with Neo4j.

Features

• CRUD operations for Nodes and Relationships
• Transaction statement execution

Requirements

• iOS8+
• Xcode 6.1.1

Feedback

Because this framework is open source it is best for most situations to post on Stack Overflow and tag it Theo. If you do find a bug please file an issue or issue a PR for any features or fixes.

Installation

1. Add it as a submodule to your existing project. git submodule add git@github.com:GraphStory/neo4j-ios.git
2. Open the Theo folder, and drag Theo.xcodeproj into the file navigator of your Xcode project.
3. In Xcode, navigate to the target configuration window by clicking on the blue project icon, and selecting the application target under the "Targets" heading in the sidebar.
4. In the tab bar at the top of that window, open the "Build Phases" panel.
5. Expand the "Link Binary with Libraries" group, and add Theo.framework.
6. Click on the + button at the top left of the panel and select "New Copy Files Phase". Rename this new phase to "Copy Frameworks", set the "Destination" to "Frameworks", and add Theo.framework.

Usage

Initalization

Without authentication

let theo: Client = Client(baseURL: "hostname.com")

With authentication

let theo: Client = Client(baseURL: "hostname.com", user: "username", pass: "password")

Fetch meta for a graph

theo.metaDescription({(meta, error) in
    println("meta in success \(meta) error \(error)")
})

Fetch a node via id

theo.fetchNode("IDToFetch", completionBlock: {(node, error) in    
    println("meta in success \(node!.meta) node \(node) error \(error)")
})

Create a node

Without Labels

let node = Node()
let randomString: String = NSUUID.UUID().UUIDString

node.setProp("propertyKey_1", propertyValue: "propertyValue_1" + randomString)
node.setProp("propertyKey_2", propertyValue: "propertyValue_2" + randomString)

theo.createNode(node, completionBlock: {(node, error) in
    println("new node \(node)")
});

With Labels

let node = Node()
let randomString: String = NSUUID.UUID().UUIDString

node.setProp("propertyKey_1", propertyValue: "propertyValue_1" + randomString)
node.setProp("propertyKey_2", propertyValue: "propertyValue_2" + randomString)
node.addLabel("customLabelForNode_" + randomString)

theo.createNode(node, completionBlock: {(node, error) in
    println("new node \(node)")
});

Update properties for a node

let updatedPropertiesDictionary: [String:String] = ["test_update_property_label_1": "test_update_property_lable_2"]

theo.updateNode(updateNode!, properties: updatedPropertiesDictionary,
    completionBlock: {(node, error) in
})

Deleting a node

theo.deleteNode("IDForDeletion", completionBlock: {error in
    println("error \(error?.description)")
})

Create a relationship

var relationship: Relationship = Relationship()

relationship.relate(parentNodeInstance, toNode: relatedNodeInstance, type: RelationshipType.KNOWS)

// setting properties is optional
relationship.setProp("my_relationship_property_name", propertyValue: "my_relationship_property_value")

theo.createRelationship(relationship, completionBlock: {(node, error) in
    println("meta in success \(node!.meta) node \(node) error \(error)")
})

Delete a relationship

theo.fetchRelationshipsForNode("nodeIDWithRelationships", direction: RelationshipDirection.ALL, types: nil, completionBlock: {(relationships, error) in

    if let foundRelationship: Relationship = relationships[0] as Relationship! {
        
        if let relMeta: RelationshipMeta = foundRelationship.relationshipMeta {
            relationshipIDToDelete = relMeta.relationshipID()
        }
        
        theo.deleteRelationship(relationshipIDToDelete!, completionBlock: {error in

        })
    }
})

Update a relationship

let updatedProperties: Dictionary<String, AnyObject> = ["updatedRelationshipProperty" : "updatedRelationshipPropertyValue"]

theo.updateRelationship(foundRelationshipInstance, properties: updatedProperties, completionBlock: {(_, error) in

})

Execute a transaction

let createStatement: String = "CREATE ( bike:Bike { weight: 10 } ) CREATE ( frontWheel:Wheel { spokes: 3 } ) CREATE ( backWheel:Wheel { spokes: 32 } ) CREATE p1 = bike -[:HAS { position: 1 } ]-> frontWheel CREATE p2 = bike -[:HAS { position: 2 } ]-> backWheel RETURN bike, p1, p2"        
let resultDataContents: Array<String> = ["row", "graph"]
let statement: Dictionary <String, AnyObject> = ["statement" : createStatement, "resultDataContents" : resultDataContents]
let statements: Array<Dictionary <String, AnyObject>> = [statement]

theo.executeTransaction(statements, completionBlock: {(response, error) in
    println("response \(response) and error \(error?.description")
})

Execute a cypher query

        let theo: Client = Client(baseURL: configuration.host, user: configuration.username, pass: configuration.password)
        let cyperQuery: String = "MATCH (u:User {username: {user} }) WITH u MATCH (u)-[:FOLLOWS*0..1]->f WITH DISTINCT f,u MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..3]-p RETURN p.contentId as contentId, p.title as title, p.tagstr as tagstr, p.timestamp as timestamp, p.url as url, f.username as username, f=u as owner"
        let cyperParams: Dictionary<String, AnyObject> = ["user" : "ajordan"]

        theo.executeCypher(cyperQuery, params: cyperParams, completionBlock: {(cypher, error) in
            println("response from cyper \(cypher)")
        })

Unit Tests

Setup

There is a file called, TheoConfig.json.example which you should copy to TheoConfig.json. You can add your username, password and baseUrl to this config and the test classes use these instead of having to modify any actual class files. TheoConfig.json is in the .gitignore so you don't have to worry about creds being committed.

Execution

• Select the unit test target
• Hit CMD-U

Creator

Cory Wiles (@kwylez)

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neo4j-ios

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