9 replies

Using seed and changeset generators with child resources

I have a

Child

Child

resource that

belongs_to

belongs_to

Parent

Parent

. I'd like to use the seed and changeset generators with these resources in my tests. I'd like to

- generate the

Child

Child

along with a unique

Parent

Parent

in one generator call
-

child = generate(child_seed())

child = generate(child_seed())

child = generate(child_changeset())

child = generate(child_changeset())

- optionally accept a parent id to bypass parent generation
-

child = generate(child_seed(parent_id: 123))

child = generate(child_seed(parent_id: 123))

child = generate(child_changeset(parent_id: 123))

child = generate(child_changeset(parent_id: 123))

- have this work in property tests

My first try with the changeset generator looks like this. It works, but I don't like it.

  def child_changeset(opts \\ []) do
    changeset_generator(
      Child,
      :create,
      uses: %{},
      defaults: fn %{} ->
        if Keyword.get(opts, :parent_id) do
          []
        else
          parent = generate(ParentGenerator.parent_changeset())
          [parent_id: parent.id]
        end
      end,
      overrides: opts
    )
  end

  def child_changeset(opts \\ []) do
    changeset_generator(
      Child,
      :create,
      uses: %{},
      defaults: fn %{} ->
        if Keyword.get(opts, :parent_id) do
          []
        else
          parent = generate(ParentGenerator.parent_changeset())
          [parent_id: parent.id]
        end
      end,
      overrides: opts
    )
  end

I poked away at an implementation using

seed_generator

seed_generator

but failed to get something that worked.

I have a few questions:

- What is the best way to do this?
- Does anyone else use the generators in this way?
- Is the purpose of

uses

uses

to wrap constants with

StreamData.constant

StreamData.constant

?
- Why the difference in interface between

seed_generator

seed_generator

and

changeset_generator

changeset_generator

beyond

changeset_generator

changeset_generator

taking an action?

Thanks

Using seed and changeset generators with child resources

I have a

Child

Child

resource that

belongs_to

belongs_to

Parent

Parent

. I'd like to use the seed and changeset generators with these resources in my tests. I'd like to

- generate the

Child

Child

along with a unique

Parent

Parent

in one generator call
-

child = generate(child_seed())

child = generate(child_seed())

child = generate(child_changeset())

child = generate(child_changeset())

- optionally accept a parent id to bypass parent generation
-

child = generate(child_seed(parent_id: 123))

child = generate(child_seed(parent_id: 123))

child = generate(child_changeset(parent_id: 123))

child = generate(child_changeset(parent_id: 123))

- have this work in property tests

My first try with the changeset generator looks like this. It works, but I don't like it.

  def child_changeset(opts \\ []) do
    changeset_generator(
      Child,
      :create,
      uses: %{},
      defaults: fn %{} ->
        if Keyword.get(opts, :parent_id) do
          []
        else
          parent = generate(ParentGenerator.parent_changeset())
          [parent_id: parent.id]
        end
      end,
      overrides: opts
    )
  end

  def child_changeset(opts \\ []) do
    changeset_generator(
      Child,
      :create,
      uses: %{},
      defaults: fn %{} ->
        if Keyword.get(opts, :parent_id) do
          []
        else
          parent = generate(ParentGenerator.parent_changeset())
          [parent_id: parent.id]
        end
      end,
      overrides: opts
    )
  end

I poked away at an implementation using

seed_generator

seed_generator

but failed to get something that worked.

I have a few questions:

- What is the best way to do this?
- Does anyone else use the generators in this way?
- Is the purpose of

uses

uses

to wrap constants with

StreamData.constant

StreamData.constant

?
- Why the difference in interface between

seed_generator

seed_generator

and

changeset_generator

changeset_generator

beyond

changeset_generator

changeset_generator

taking an action?

Thanks

Using seed and changeset generators with child resources

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