GetJson

trait GetJson extends AnyRef

Data getter methods on molecules that return a Json String.

Molecule builds a Json String directly from the untyped raw Datomic data.

Attributes names are used as Json field names. In order to distinguish fields from each other, all attribute names are prepended with the namespace name (in lowercase). For a namespace Person with an attribute name we get:

"person.name"

To distinguis fields of multiple relationships to the same namespace like friends and enemies pointing to other Person's require us to add a relationship name prefix too:

"friends.person.name"
"enemies.person.name"

Furthermore, if the attribute is part of a transaction meta-data molecule, we prefix that with tx too:

"tx.person.name"
"tx.friends.person.name"

Self Type: GetJson with MoleculeBase with JsonBuilder
Source: GetJson.scala
See also: Json tests

Linear Supertypes

AnyRef, Any

Known Subclasses

Molecule, Molecule01, Molecule02, Molecule03, Molecule04, Molecule05, Molecule06, Molecule07, Molecule08, Molecule09, Molecule10, Molecule11, Molecule12, Molecule13, Molecule14, Molecule15, Molecule16, Molecule17, Molecule18, Molecule19, Molecule20, Molecule21, Molecule22

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@native()
def getJson(n: Int)(implicit conn: Conn): String
Get json data for n rows matching molecule
Get json data for n rows matching molecule
```
Person.name.age.getJson(1) ===
  """[
    |{"person.name": "Ben", "person.age": 42}
    |]""".stripMargin
```
Namespace.Attribute is used as json fields. Values are quoted when necessary. Nested data becomes json objects etc.
n
Number of rows returned
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on getJson
Equivalent asynchronous getAsyncJson method.
def getJson(implicit conn: Conn): String
Get json data for all rows matching molecule.
Get json data for all rows matching molecule.
```
Person.name.age.getJson ===
  """[
    |{"person.name": "Ben", "person.age": 42},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin
```
Namespace.Attribute is used as json fields. Values are quoted when necessary. Nested data becomes json objects etc.
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on getJson
Equivalent asynchronous getAsyncJson method.

def getJsonAsOf(date: Date, n: Int)(implicit conn: Conn): String

Get json data for n rows matching molecule as of tx.

Get json data for n rows matching molecule as of tx.

Get data at a human point in time (a java.util.Date).

val beforeInsert = new java.util.Date

// Insert
val tx1 = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37)
)
val List(ben, liz) = tx1.eids
val afterInsert = new java.util.Date

// Update
val tx2 = Person(ben).age(43).update
val afterUpdate = new java.util.Date

// Get List of all rows as of afterUpdate
Person.name.age.getJsonAsOf(afterUpdate) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get List of n rows as of afterUpdate
Person.name.age.getJsonAsOf(afterUpdate, 1) ===
  """[
    |{"person.name": "Ben", "person.age": 43}
    |]""".stripMargin

date: java.util.Date
n: Int Number of rows returned
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonAsOf(date: Date)(implicit conn: Conn): String

Get json data for all rows matching molecule as of date.

Get json data for all rows matching molecule as of date.

Get data at a human point in time (a java.util.Date).

val beforeInsert = new java.util.Date

// Insert
val tx1 = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37),
)
val List(ben, liz) = tx1.eids
val afterInsert = new java.util.Date

// Update
val tx2 = Person(ben).age(43).update
val afterUpdate = new java.util.Date

// Retract
val tx3 = ben.retract
val afterRetract = new java.util.Date

// No data yet before insert
Person.name.age.getJsonAsOf(beforeInsert) === ""

// Get List of all rows as of afterInsert
Person.name.age.getJsonAsOf(afterInsert) ===
  """[
    |{"person.name": "Ben", "person.age": 42},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get List of all rows as of afterUpdate
Person.name.age.getJsonAsOf(afterUpdate) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get List of all rows as of afterRetract
Person.name.age.getJsonAsOf(afterRetract) ===
  """[
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

date: java.util.Date
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonAsOf(tx: TxReport, n: Int)(implicit conn: Conn): String
Get json data for n rows matching molecule as of tx.
Get json data for n rows matching molecule as of tx.

Datomic's internal asOf method can take a transaction entity id as argument to retrieve a database value as of that transaction (including).

Instead of supplying the transaction entity id, in Molecule we supply a TxReport that contains the transaction entity id (which is used as argument to Datomic internally). This is more convenient when using Molecule since we get a TxReport from transaction operations like get, update, retract etc.
```
// Insert (tx report 1)
val tx1 = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37)
)
val List(ben, liz) = tx1.eids

// Update (tx report 2)
val tx2 = Person(ben).age(43).update

// Get json for all rows as of transaction tx2 (after update) - Ben now 43
Person.name.age.getJsonAsOf(tx2) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for n rows as of transaction tx2 (after update) - Ben now 43
Person.name.age.getJsonAsOf(tx2, 1) ===
  """[
    |{"person.name": "Ben", "person.age": 43}
    |]""".stripMargin
```
tx
TxReport (returned from all molecule transaction operations)
n
Int Number of rows returned
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonAsOf(tx: TxReport)(implicit conn: Conn): String

Get json data for all rows matching molecule as of tx.

Get json data for all rows matching molecule as of tx.

Datomic's internal asOf method can take a transaction entity id as argument to retrieve a database value as of that transaction (including).

Instead of supplying the transaction entity id, in Molecule we supply a TxReport that contains the transaction entity id (which is used as argument to Datomic internally). This is more convenient when using Molecule since we get a TxReport from transaction operations like get, update, retract etc.

// Insert (tx report 1)
val tx1 = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37)
)
val List(ben, liz) = tx1.eids

// Update (tx report 2)
val tx2 = Person(ben).age(43).update

// Retract (tx report 3)
val tx3 = ben.retract

// Get json for all rows as of transaction tx1 (after insert)
Person.name.age.getJsonAsOf(tx1) ===
  """[
    |{"person.name": "Ben", "person.age": 42},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for all rows as of transaction tx2 (after update) - Ben now 43
Person.name.age.getJsonAsOf(tx2) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for all rows as of transaction tx3 (after retract) - Ben gone
Person.name.age.getJsonAsOf(tx3) ===
  """[
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

tx: TxReport (returned from all molecule transaction operations)
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonAsOf(t: Long, n: Int)(implicit conn: Conn): String

Get json data for n rows matching molecule as of transaction time t.

Get json data for n rows matching molecule as of transaction time t.

Transaction time t is an auto-incremented transaction number assigned internally by Datomic.

t can for instance be retrieved in a getHistory call for an attribute and then be used to get data as of that point in time (including that transaction):

// Insert (t 1028)
val List(ben, liz) = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37)
) eids

// Update (t 1031)
Person(ben).age(43).update

// History of Ben
Person(ben).age.t.op.getHistory.sortBy(r => (r._2, r._3)) === List(
  (42, 1028, true),  // Insert:  42 asserted
  (42, 1031, false), // Update:  42 retracted
  (43, 1031, true),  //          43 asserted
)

// Get json for all rows as of transaction t 1031 (after update)
Person.name.age.getJsonAsOf(1031) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for n (1) rows as of transaction t 1031 (after update)
Person.name.age.getJsonAsOf(1031, 1) ===
  """[
    |{"person.name": "Ben", "person.age": 43}
    |]""".stripMargin

t: Transaction time t
n: Int Number of rows returned
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonAsOf(t: Long)(implicit conn: Conn): String

Get json data for all rows matching molecule as of transaction time t.

Get json data for all rows matching molecule as of transaction time t.

Transaction time t is an auto-incremented transaction number assigned internally by Datomic.

t can for instance be retrieved in a getHistory call for an attribute and then be used to get data as of that point in time (including that transaction):

// Insert (t 1028)
val List(ben, liz) = Person.name.age insert List(
  ("Ben", 42),
  ("Liz", 37)
) eids

// Update (t 1031)
Person(ben).age(43).update

// Retract (t 1032)
ben.retract

// History of Ben
Person(ben).age.t.op.getHistory.sortBy(r => (r._2, r._3)) === List(
  (42, 1028, true),  // Insert:  42 asserted
  (42, 1031, false), // Update:  42 retracted
  (43, 1031, true),  //          43 asserted
  (43, 1032, false)  // Retract: 43 retracted
)

// Get json for all rows as of transaction t 1028 (after insert)
Person.name.age.getJsonAsOf(1028) ===
  """[
    |{"person.name": "Ben", "person.age": 42},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for all rows as of transaction t 1031 (after update) - Ben now 43
Person.name.age.getJsonAsOf(1031) ===
  """[
    |{"person.name": "Ben", "person.age": 43},
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

// Get json for all rows as of transaction t 1032 (after retract) - Ben gone
Person.name.age.getJsonAsOf(1032) ===
  """[
    |{"person.name": "Liz", "person.age": 37}
    |]""".stripMargin

t: Transaction time t
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonAsOf method.

def getJsonComposite(conn: Conn, n: Int): String
Attributes
protected
def getJsonFlat(conn: Conn, n: Int): String
Attributes
protected

def getJsonSince(date: Date, n: Int)(implicit conn: Conn): String

Get json data for n rows matching molecule since date.

Get json data for n rows matching molecule since date.

Get data added/retracted since a human point in time (a java.util.Date).

// Transact 3 times (`inst` retrieves transaction time/Date from tx report)
val date1 = Person.name("Ann").save.inst
val date2 = Person.name("Ben").save.inst
val date3 = Person.name("Cay").save.inst

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since date1
Person.name.getJsonSince(date1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Ben and Cay added since date1 - only n (1) rows returned
Person.name.getJsonSince(date1, 1) ===
  """[
    |{"person.name": "Ben"}
    |]""".stripMargin

date: java.util.Date
n: Int Number of rows returned
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.

def getJsonSince(date: Date)(implicit conn: Conn): String

Get json data for all rows matching molecule since date.

Get json data for all rows matching molecule since date.

Get data added/retracted since a human point in time (a java.util.Date).

// Transact 3 times (`inst` retrieves transaction time/Date from tx report)
val date1 = Person.name("Ann").save.inst
val date2 = Person.name("Ben").save.inst
val date3 = Person.name("Cay").save.inst

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since date1
Person.name.getJsonSince(date1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Cay added since date2
Person.name.getJsonSince(date2) ===
  """[
    |{"person.name": "Cay"}
    |]""".stripMargin

// Nothing added since date3
Person.name.getJsonSince(date3) === ""

date: java.util.Date
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.

def getJsonSince(tx: TxReport, n: Int)(implicit conn: Conn): String
Get json data for n rows matching molecule since tx.
Get json data for n rows matching molecule since tx.

Datomic's internal since can take a transaction entity id as argument to retrieve a database value since that transaction (excluding the transaction itself).

Instead of supplying the transaction entity id, in Molecule we supply a TxReport that contains the transaction entity id (which is used as argument to Datomic internally). This is more convenient when using Molecule since we getAsync a TxReport from transaction operations like get, update, retract etc.
```
// Get tx reports for 3 transactions
val tx1 = Person.name("Ann").save
val tx2 = Person.name("Ben").save
val tx3 = Person.name("Cay").save

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since tx1
Person.name.getJsonSince(tx1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Ben and Cay added since tx1 - only n (1) rows returned
Person.name.getJsonSince(tx1, 1) ===
  """[
    |{"person.name": "Ben"}
    |]""".stripMargin
```
tx
TxReport (returned from all molecule transaction operations)
n
Int Number of rows returned
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.
def getJsonSince(tx: TxReport)(implicit conn: Conn): String
Get json data for all rows matching molecule since tx.
Get json data for all rows matching molecule since tx.

Datomic's internal since can take a transaction entity id as argument to retrieve a database value since that transaction (excluding the transaction itself).

Instead of supplying the transaction entity id, in Molecule we supply a TxReport that contains the transaction entity id (which is used as argument to Datomic internally). This is more convenient when using Molecule since we getAsync a TxReport from transaction operations like get, update, retract etc.
```
// Get tx reports for 3 transactions
val tx1 = Person.name("Ann").save
val tx2 = Person.name("Ben").save
val tx3 = Person.name("Cay").save

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since tx1
Person.name.getJsonSince(tx1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Cay added since tx2
Person.name.getJsonSince(tx2) ===
  """[
    |{"person.name": "Cay"}
    |]""".stripMargin

// Nothing added since tx3
Person.name.getJsonSince(tx3) === ""
```
tx
TxReport (returned from all molecule transaction operations)
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.
def getJsonSince(t: Long, n: Int)(implicit conn: Conn): String
Get json data for n rows matching molecule since transaction time t.
Get json data for n rows matching molecule since transaction time t.

Transaction time t is an auto-incremented transaction number assigned internally by Datomic.

t can for instance be retrieved by calling t on the tx report returned from transactional operations and then be used to get data since that point in time (excluding that transaction):
```
// 3 transaction times `t`
val t1 = Person.name("Ann").save.t
val t2 = Person.name("Ben").save.t
val t3 = Person.name("Cay").save.t

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since transaction time t 1028
Person.name.getJsonSince(t1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Ben and Cay added since transaction time t 1028 - only n (1) rows returned
Person.name.getJsonSince(t1, 1) ===
  """[
    |{"person.name": "Ben"}
    |]""".stripMargin
```
t
Transaction time t
n
Int Number of rows returned
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.
def getJsonSince(t: Long)(implicit conn: Conn): String
Get json data for all rows matching molecule since transaction time t.
Get json data for all rows matching molecule since transaction time t.

Transaction time t is an auto-incremented transaction number assigned internally by Datomic.

t can for instance be retrieved by calling t on the tx report returned from transactional operations and then be used to get data since that point in time (excluding that transaction):
```
// 3 transaction times `t`
val t1 = Person.name("Ann").save.t
val t2 = Person.name("Ben").save.t
val t3 = Person.name("Cay").save.t

// Current values
Person.name.get === List("Ann", "Ben", "Cay")

// Ben and Cay added since transaction time t 1028
Person.name.getJsonSince(t1) ===
  """[
    |{"person.name": "Ben"},
    |{"person.name": "Cay"}
    |]""".stripMargin

// Cay added since transaction time t 1030
Person.name.getJsonSince(t2) ===
  """[
    |{"person.name": "Cay"}
    |]""".stripMargin

// Nothing added since transaction time t 1032
Person.name.getJsonSince(t3) === ""
```
t
Transaction time t
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on asof/since
Equivalent asynchronous getAsyncJsonSince method.
def getJsonWith(txData: List[_], n: Int)(implicit conn: Conn): String
Get json data for n rows matching molecule with applied raw transaction data.
Get json data for n rows matching molecule with applied raw transaction data.

Apply raw transaction data to in-memory "branch" of db without affecting db to see how it would then look:
```
// Live size of Person db
Person.name.get.size === 150

// Read some transaction data from file
val data_rdr2 = new FileReader("examples/resources/seattle/seattle-data1a.dtm")
val newDataTx = Util.readAll(data_rdr2).get(0).asInstanceOf[java.util.List[Object]]

// Imagine future db - 100 persons would be added, apparently
Person.name.getJsonWith(newDataTx).size === 250

// Imagine future db - Let's just take 10
Person.name.getJsonWith(newDataTx, 10).size === 10
```
txData
Raw transaction data as java.util.List[Object]
n
Int Number of rows returned
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on with
Equivalent asynchronous getAsyncJsonWith method.
def getJsonWith(txData: List[_])(implicit conn: Conn): String
Get json data for all rows matching molecule with applied raw transaction data.
Get json data for all rows matching molecule with applied raw transaction data.

Apply raw transaction data to in-memory "branch" of db without affecting db to see how it would then look:
```
// Live size of Person db
Person.name.get.size === 150

// Read some transaction data from file
val data_rdr2 = new FileReader("examples/resources/seattle/seattle-data1a.dtm")
val newDataTx = Util.readAll(data_rdr2).get(0).asInstanceOf[java.util.List[Object]]

// Imagine future db - 100 persons would be added, apparently
Person.name.getJsonWith(newDataTx).size === 250
```
txData
Raw transaction data as java.util.List[Object]
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on with
Equivalent asynchronous getAsyncJsonWith method.

def getJsonWith(n: Int, txMolecules: Seq[Seq[Statement]]*)(implicit conn: Conn): String

Get json data for all rows matching molecule with applied molecule transaction data.

Get json data for all rows matching molecule with applied molecule transaction data.

Apply one or more molecule transactions to in-memory "branch" of db without affecting db to see how it would then look:

// Current state
val List(ben, liz) = Person.name.likes.insert(
  ("Ben", "pasta"),
  ("Liz", "pizza")
).eids

// Test multiple transactions
Person.name.likes.getJsonWith(
  Person(ben).likes("sushi").getUpdateTx,
  Person(liz).likes("cake").getUpdateTx
) ===
  """[
    |{"person.name": "Ben", "person.likes": "sushi"},
    |{"person.name": "Liz", "person.likes": "cake"}
    |]""".stripMargin

// Same as above, but only n (1) rows returned:
Person.name.likes.getJsonWith(
  1
  Person(ben).likes("sushi").getUpdateTx,
  Person(liz).likes("cake").getUpdateTx
) ===
  """[
    |{"person.name": "Ben", "person.likes": "sushi"}
    |]""".stripMargin

Multiple transactions can be applied to test more complex what-if scenarios!

txMolecules: Transaction statements from applied Molecules with test data
conn: Implicit Conn value in scope
returns: String of json

See also: Manual on with
Equivalent asynchronous getAsyncJsonWith method.

def getJsonWith(txMolecules: Seq[Seq[Statement]]*)(implicit conn: Conn): String
Get json data for all rows matching molecule with applied molecule transaction data.
Get json data for all rows matching molecule with applied molecule transaction data.

Apply one or more molecule transactions to in-memory "branch" of db without affecting db to see how it would then look:
```
// Current state
val ben = Person.name("Ben").likes("pasta").save.eid

// Base data
Person.name.likes.getJsonWith(
  // apply imaginary transaction data
  Person(ben).likes("sushi").getUpdateTx
) ===
  """[
    |{"person.name": "Ben", "person.likes": "sushi"}
    |]""".stripMargin

// Current state is still the same
Person.name.likes.get === List(("Ben", "pasta"))
```
Multiple transactions can be applied to test more complex what-if scenarios!
txMolecules
Transaction statements from applied Molecules with test data
conn
Implicit Conn value in scope
returns
String of json
See also
Manual on with
Equivalent asynchronous getAsyncJsonWith method.
def hashCode(): Int
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api		Molecule API.
ast		Internal Molecule ASTs.
boilerplate		Internal interfaces for auto-generated DSL boilerplate code.
composition		Builder methods to compose molecules.
exceptions		Exceptions thrown by Molecule.
expression		Attribute expressions and operations.
facade		Molecule facades to Datomic.
factory		Implicit macro methods `m` to instantiate molecules from custom DSL molecule constructs.
input		Input molecules awaiting input.
macros		Internal macros generating molecule code from custom DSL molecule constructs.
generic		Interfaces to generic information about datoms and Datomic database.
ops		Internal operational helpers for transforming DSL to molecule.
schema		Schema definition DSL.
transform		Internal transformers from DSL to Model/Query/Transaction.
util		Internal Java database functions for Datomic.

Packages

Sub-packages

GetJson

trait GetJson extends AnyRef

Value Members

Inherited from AnyRef

Inherited from Any

get

getJsonAsOf

getJsonSince

getJsonWith

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Packages

Sub-packages

GetJson

trait GetJson extends AnyRef

Value Members

Inherited from AnyRef

Inherited from Any

get

getJsonAsOf

getJsonSince

getJsonWith

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GetJson