Factories

A sub-package containing factories for your models are also generated.

note

To disable factory generation, set no_factory: true in your configuration

What are bob factories?

A factory is an object that can create templates for new models.

f := factory.New()

// Create a new template from the factory
jetTemplate := f.NewJet(...factory.JetMod)

While we can always add mods when getting a new template, it is often useful to set mods on the factory that will always be applied to any new template:

f := factory.New()

f.AddBaseJetMods(
    factory.JetMods.RandomID(),
    factory.JetMods.RandomAirportID(),
)

// The jet templates will generate models with random IDs and AirportIDs
jetTemplate1 := f.NewJet()
jetTemplate2 := f.NewJet()

// We can also clear the base mods
f.ClearBaseJetMods()

Mods

Factory mods affect how the template will generate models.

type JetMod interface {
    Apply(*JetTemplate)
}

tip

For very custom use cases, you can write your own JetMod.
As long as it implements the interface, it can be used in the same way as the generated mods.

Column Mods

Mods are generated to change how columns are set from the template.

f.NewJet(
   // generate models with ID set to 10
   factory.JetMods.ID(10),

   // generate models with ID set by a function that returns a random integer
   factory.JetMods.IDFunc(func() int { return rand.Int() }),

   // Clear any previously set ID
   factory.JetMods.UnsetID(),

   // Generate a random value for the column
   // Uses a faker from https://github.com/jaswdr/faker
   // pass nil to use the default faker
   factory.JetMods.RandomID(nil),

   // Set random values on all columns
   factory.JetMods.RandomizeAllColumns(nil),
)

Relationship Mods

Mods are generated to modify the relationship of models from the template.

// FOR to-one relationships
f.NewJet(
    // Clear the related pilot
    factory.JetMods.WithoutPilot(),

    // add a pilot from the given template
    factory.JetMods.WithPilot(&PilotTemplate),

    // generate a new pilot template from the same factory and use it
    factory.JetMods.WithNewPilot(...factory.PilotMod),
)

// FOR to-many relationships
f.NewPilot(
    // Clear all related jets
    factory.PilotMods.WithoutJets(),

    //---------------------------------------------------
    // SET variants overwrite any existing relationships
    //---------------------------------------------------

    // set exactly 5 jets generated from the given template
    factory.PilotMods.WithJets(5, &JetTemplate{}),

    // set exactly 5 jets generated from the same factory with the given mods
    factory.PilotMods.WithNewJets(5, ...factory.JetMod),

    //---------------------------------------------------
    // ADD variants append to existing relationships
    //---------------------------------------------------

    // add 5 jets generated from the given template
    factory.PilotMods.AddJets(5, &JetTemplate{}),

    // add 5 jets generated from the same factory with the given mods
    factory.PilotMods.AddNewJets(5, ...factory.JetMod),
)

Using a Template

From a template we can:

Build

note

Build variants DO NOT interact with the database

// Build a new jet setter from the template
// naturally, this ignores relationships
jetSetter := jetTemplate.BuildSetter()

// Build a slice of 5 jet setters using the template
// also ignores relationships
jetSetters := jetTemplate.BuildManySetter(5)

// Build a new jet from the template
// related templates are built and put in the `R` struct
jet := jetTemplate.Build()

// Build a slice of 5 jets using the template
jets := jetTemplate.BuildMany(5)

Create

note

Create variants insert the models into the database
Any required relation (i.e. a non-nullable foreign key), will also be created even if the template did not define one.

// Create a new jet from the template
jet := jetTemplate.Create(ctx, db)

// Create a slice of 5 jets using the template
jets := jetTemplate.CreateMany(ctx, db, 5)