From 573a373ae2c3fe356871944bcfc891ababc11bbe Mon Sep 17 00:00:00 2001
From: Seth Axen <seth.axen@gmail.com>
Date: Wed, 19 Jan 2022 00:20:44 +0100
Subject: [PATCH 1/3] Convert prior predictive even if prior not provided

---
 src/mcmcchains.jl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/mcmcchains.jl b/src/mcmcchains.jl
index 79b1e8a3..0d207140 100644
--- a/src/mcmcchains.jl
+++ b/src/mcmcchains.jl
@@ -268,6 +268,14 @@ function from_mcmcchains(
             ),
         )
         concat!(all_idata, prior_idata)
+    elseif prior_predictive !== nothing
+        pre_prior_predictive_idata = convert_to_inference_data(
+            prior_predictive; eltypes=eltypes, kwargs...
+        )
+        concat!(
+            all_idata,
+            InferenceData(; prior_predictive=pre_prior_predictive_idata.posterior),
+        )
     end
 
     for (group, group_data) in [

From 71215d30d7d8f4ea15996aad0dd5f204615e6bbc Mon Sep 17 00:00:00 2001
From: Seth Axen <seth.axen@gmail.com>
Date: Wed, 19 Jan 2022 00:20:52 +0100
Subject: [PATCH 2/3] Add test

---
 test/test_mcmcchains.jl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/test_mcmcchains.jl b/test/test_mcmcchains.jl
index abc5ad5a..a326e823 100644
--- a/test/test_mcmcchains.jl
+++ b/test/test_mcmcchains.jl
@@ -250,6 +250,17 @@ end
         @test "z" ∈ keys(dimdict(idata.predictions_constant_data))
     end
 
+    # https://github.com/arviz-devs/ArviZ.jl/issues/146
+    @testset "prior predictive w/o prior" begin
+        nvars, nchains, ndraws = 2, 4, 20
+        chns = makechains(nvars, ndraws, nchains)
+        prior_predictive = randn(nchains, ndraws, 1)
+        idata = from_mcmcchains(chns; prior_predictive=prior_predictive)
+        test_chains_data(chns, idata, :posterior, names(chns))
+        @test :prior_predictive ∈ ArviZ.groupnames(idata)
+        @test idata.prior_predictive.x.values ≈ prior_predictive
+    end
+
     @testset "missing -> NaN" begin
         rng = MersenneTwister(42)
         nvars, nchains, ndraws = 2, 4, 20

From 42e7cbe944de22c8627046c35ce9ec35eefc2574 Mon Sep 17 00:00:00 2001
From: Seth Axen <seth.axen@gmail.com>
Date: Wed, 19 Jan 2022 00:21:02 +0100
Subject: [PATCH 3/3] Increment version number

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index e5649d27..65c55411 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "ArviZ"
 uuid = "131c737c-5715-5e2e-ad31-c244f01c1dc7"
 authors = ["Seth Axen <seth.axen@gmail.com>"]
-version = "0.5.10"
+version = "0.5.11"
 
 [deps]
 Conda = "8f4d0f93-b110-5947-807f-2305c1781a2d"